Attributes { HDF5_GLOBAL { String short_name "ATL06"; String level "L3A"; String title "ATLAS/ICESat-2 L3A Land Ice Height"; String description "This data set (ATL06) provides geolocated, land-ice surface heights (above the WGS 84 ellipsoid, ITRF2014 reference frame), plus ancillary parameters that can be used to interpret and assess the quality of the height estimates. The data were acquired by th"; String Conventions "CF-1.6"; String contributor_name "Thomas E Neumann (thomas.neumann@nasa.gov), Thorsten Markus (thorsten.markus@nasa.gov), Suneel Bhardwaj (suneel.bhardwaj@nasa.gov) David W Hancock III (david.w.hancock@nasa.gov)"; String contributor_role "Instrument Engineer, Investigator, Principle Investigator, Data Producer, Data Producer"; String data_rate "Data within this group pertain to the granule in its entirety."; String date_type "UTC"; String featureType "trajectory"; String geospatial_lat_units "degrees_north"; String geospatial_lon_units "degrees_east"; String granule_type "ATL06"; String identifier_product_doi_authority "http://dx.doi.org"; String license "Data may not be reproduced or distributed without including the citation for this product included in this metadata. Data may not be distributed in an altered form without the written permission of the ICESat-2 Science Project Office at NASA/GSFC."; String naming_authority "http://dx.doi.org"; String spatial_coverage_type "Horizontal"; String standard_name_vocabulary "CF-1.6"; String time_type "CCSDS UTC-A"; String date_created "2021-02-08T16:10:17.000000Z"; String hdfversion "HDF5 1.10.3"; String history "2021-02-08T16:10:17.000000Z;26381e62-d915-3289-a51f-dc4c27d4348c;Created by PGE atlas_l3a_is Version 4.4.1"; String identifier_file_uuid "26381e62-d915-3289-a51f-dc4c27d4348c"; String identifier_product_format_version "4.4"; Float64 time_coverage_duration 460.00000000000000; String time_coverage_end "2019-02-23T23:33:15.000000Z"; String time_coverage_start "2019-02-23T23:25:35.000000Z"; Float64 geospatial_lat_min -79.006040991408540; Float64 geospatial_lon_min 151.41357232464225; Float64 geospatial_lat_max -67.924997978629051; Float64 geospatial_lon_max 157.76718345631195; String publisher_name "NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center"; String publisher_email "nsidc@nsidc.org"; String publisher_url "http://nsidc.org/daac/"; String identifier_product_type "ATL06"; String identifier_product_doi "doi:10.5067/ATLAS/ATL06.004"; String institution "National Aeronautics and Space Administration (NASA)"; String creator_name "GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System"; String summary "ATL06 provides estimates of the ice-sheet mean surface height relative to the WGS-84 ellipsoid, and ancillary parameters needed to interpret and assess the quality of these height estimates."; String keywords "EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER ELEVATION/ICE SHEET ELEVATION > NONE > NONE > NONE"; String keywords_vocabulary "NASA/GCMD Science Keywords"; String citation "Cite these data in publications as follows: The data used in this study were produced by the ICESat-2 Science Project Office at NASA/GSFC. The data archive site is the NASA National Snow and Ice Data Center Distributed Active Archive Center."; String processing_level "3A"; String references "http://nsidc.org/data/icesat2/data.html"; String project "ICESat-2 > Ice, Cloud, and land Elevation Satellite-2"; String instrument "ATLAS > Advanced Topographic Laser Altimeter System"; String platform "ICESat-2 > Ice, Cloud, and land Elevation Satellite-2"; String source "Spacecraft"; } orbit_info { String Description "Contains data that are common among all beams for the granule. These parameters are constants for a given granule."; String data_rate "These parameters are constant for a given granule."; String fullnamepath "/orbit_info"; } METADATA { String Description "ISO19115 Structured Metadata Represented within HDF5"; String iso_19139_dataset_xml " ATL06_20190223232535_08780212_004_01.h5 NSIDC DAAC > National Snow and Ice Data Center DAAC nsidc@nsidc.org http://nsidc.org/daac/ pointOfContact 2021-02-08T16:10:17.000000Z ISO 19115-2 Geographic information - Metadata - Part 2: Extensions for imagery and gridded data ISO 19115-2:2009-02-15 ATL06_20190223232535_08780212_004_01.h5 2021-02-08T16:10:17.000000Z creation ATL06 The ECS Short Name 004 The ECS Version ID ATL06_20190223232535_08780212_004_01.h5 ProducerGranuleId ATL06 provides estimates of the ice-sheet mean surface height relative to the WGS-84 ellipsoid, and ancillary parameters needed to interpret and assess the quality of these height estimates. onGoing ATL06 004 largerWorkCitation eng geoscientificInformation AscendingCrossing: 165.72608299850438 StartLatitude: -79.000000000000000 StartDirection:A EndLatitude: -50.000000000000000 EndDirection: A gov.nasa.esdis.umm.orbitparameters OrbitParameters OrbitNumber: 2466 EquatorCrossingLongitude: 165.72608299850438 EquatorCrossingDateTime: 2019-02-23T22:12:03.363842Z gov.nasa.esdis.umm.orbitcalculatedspatialdomains OrbitCalculatedSpatialDomains 2019-02-23T23:25:35.061232Z 2019-02-23T23:28:32.341805Z dataset 2021-02-08T16:10:17.000000Z;26381e62-d915-3289-a51f-dc4c27d4348c;Created by PGE atlas_l3a_is Version 4.4.1 2021-02-08T16:10:17.000000Z "; String iso_19139_series_xml " ATL06.004 eng utf8 series NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center 303-492-6199 303-492-2468 1540 30th St Campus Box 449 Boulder Colorado 80309-0449 USA nsidc@nsidc.org http://nsidc.org/daac/ 9:00 A.M. to 5:00 P.M., U.S. Mountain Time, Monday through Friday, excluding U.S. holidays. Contact by e-mail first pointOfContact 2015-10-15 ISO 19115-2 Geographic information - Metadata - Part 2: Extensions for imagery and gridded data ISO 19115-2:2009(E) ATLAS/ICESat-2 L3A Land Ice Height 2016-06-09 revision 004 ATL06 The ECS Short Name 004 The ECS Version ID doi:10.5067/ATLAS/ATL06.004 gov.nasa.esdis A Digital Object Identifier (DOI) National Aeronautics and Space Administration (NASA) resourceProvider GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System originator Initial version of the processing software ATL06 provides estimates of the ice-sheet mean surface height relative to the WGS-84 ellipsoid, and ancillary parameters needed to interpret and assess the quality of these height estimates. ATL06 provides estimates of the ice-sheet mean surface height relative to the WGS-84 ellipsoid, and ancillary parameters needed to interpret and assess the quality of these height estimates. The software that generates the ATL06 product was designed and implemented at the NASA Wallops Flight Facility in Wallops Island, Virginia. onGoing NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center distributor HDF 5 EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER ELEVATION/ICE SHEET ELEVATION > NONE > NONE > NONE EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > GLACIERS/ICE SHEETS > GLACIER ELEVATION/ICE SHEET ELEVATION > NONE > NONE > NONE theme NASA/GCMD Science Keywords NASA Global Change Master Directory (GCMD) User Support Office NASA Global Change Master Directory, Goddard Space Flight Center Greenbelt MD 20771 USA gcmduso@gcmd.gsfc.nasa.gov http://gcmd.nasa.gov/ http web browser NASA Global Change Master Directory (GCMD) Home Page information http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso custodian Global Change Master Directory (GCMD) NASA Global Change Master Directory, Goddard Space Flight Center Greenbelt MD 20771 USA gcmduso@gcmd.gsfc.nasa.gov http://gcmd.nasa.gov/Resources/valids/ http web browser NASA Global Change Master Directory (GCMD) Keyword Page This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions. download http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso custodian GEOGRAPHIC REGION > GLOBAL place NASA/GCMD Location Keywords NASA/NSIDC_DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center dataCenter NASA/GCMD Data Center Keywords Earth Observation Satellites > NASA Decadal Survey > ICESAT-2 > Ice, Cloud, and land Elevation Satellite-2 platform NASA/GCMD Platform Keywords Earth Remote Sensing Instruments > Active Remote Sensing > Altimeters > Lidar/Laser Altimeters > ATLAS > Advanced Topographic Laser Altimeter System instrument NASA/GCMD Instrument Keywords Cite these data in publications as follows: The data used in this study were produced by the ICESat-2 Science Project Office at NASA/GSFC. The data archive site is the NASA National Snow and Ice Data Center Distributed Active Archive Center. eng geoscientificInformation SpatialCoverageType=HORIZONTAL, SpatialGranuleSpatialRepresentation=ORBIT, TemporalRangeType=Continuous Range, TimeType=UTC -180.0 180.0 -90.0 90.0 SwathWidth: 36.0 Period: 96.8 InclinationAngle: 92.0 NumberOfOrbits: 0.071428571 StartCircularLatitude: 0.0 gov.nasa.esdis.umm.orbitparameters OrbitParameters 2005-01-01T00:00:00Z 2020-12-31T23:59:59Z 3A 3A HDF 5 NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center distributor http://nsidc.org/data/icesat2/data.html http Data Product Description Page information http://nsidc.org/data/icesat2/order.html http Data Product Order Page order http://dx.doi.org/10.5067/ATLAS/ATL06.004 http Digital Object Identifier URL information ATLAS > Advanced Topographic Laser Altimeter System ATLAS Advanced Topographic Laser Altimeter System Laser Altimeter ATLAS on ICESat-2 determines the range between the satellite and the Earth's surface by measuring the two-way time delay of short pulses of laser light that it transmits in six beams. It is different from previous operational ice-sheet altimeters in that it is a photon-counting LIDAR. ATLAS records a set of arrival times for individual photons, which are then analyzed to derive surface, vegetation, and cloud properties. ATLAS has six beams arranged in three pairs, so that it samples each of three reference pair tracks with a pair of beams; ATLAS transmits pulses at 10 kHz, giving approximately one pulse every 0.7 m along track; ATLAS's expected pointing control will be better than 90 m RMS. ICESat-2 > Ice, Cloud, and land Elevation Satellite-2 ICESat-2 > Ice, Cloud, and land Elevation Satellite-2 ICESat-2 Ice, Cloud, and land Elevation Satellite-2 underDevelopment ICESat-2 > Ice, Cloud, and land Elevation Satellite-2 ICESat-2 Ice, Cloud, and land Elevation Satellite-2 Spacecraft "; String fullnamepath "/METADATA"; } METADATA_AcquisitionInformation { } METADATA_AcquisitionInformation_lidar { String pulse_rate "10000 pps"; String wavelength "532 nm"; String identifier "ATLAS"; String type "Laser Altimeter"; String description "ATLAS on ICESat-2 determines the range between the satellite and the Earth's surface by measuring the two-way time delay of short pulses of laser light that it transmits in six beams. It is different from previous operational ice-sheet altimeters in that it is a photon-counting LIDAR. ATLAS records a set of arrival times for individual photons, which are then analyzed to derive surface, vegetation, and cloud properties. ATLAS has six beams arranged in three pairs, so that it samples each of three reference pair tracks with a pair of beams; ATLAS transmits pulses at 10 kHz, giving approximately one pulse every 0.7 m along track; ATLAS's expected pointing control will be better than 90 m RMS."; String fullnamepath "/METADATA/AcquisitionInformation/lidar"; } METADATA_AcquisitionInformation_lidarDocument { String edition "Pre-Release"; String publicationDate "12/31/17"; String title "A document describing the ATLAS instrument will be provided by the ICESat-2 Project Science Office."; String fullnamepath "/METADATA/AcquisitionInformation/lidarDocument"; } METADATA_AcquisitionInformation_platform { String identifier "ICESat-2"; String description "Ice, Cloud, and land Elevation Satellite-2"; String type "Spacecraft"; String fullnamepath "/METADATA/AcquisitionInformation/platform"; } METADATA_AcquisitionInformation_platformDocument { String edition "31-Dec-16"; String publicationDate "31-Dec-16"; String title "The Ice, Cloud, and land Elevation Satellite-2 (ICESat-2): Science requirements, concept, and implementation. Thorsten Markus, Tom Neumann, Anthony Martino, Waleed Abdalati, Kelly Brunt, Beata Csatho, Sinead Farrell, Helen Fricker, Alex Gardner, David Harding, Michael Jasinski, Ron Kwok, Lori Magruder, Dan Lubin, Scott Luthcke, James Morison, Ross Nelson, Amy Neuenschwander, Stephen Palm, Sorin Popescu, CK Shum, Bob E. Schutz, Benjamin Smith, Yuekui Yang, Jay Zwally. http://dx.doi.org/10.1016/j.rse.2016.12.029"; String fullnamepath "/METADATA/AcquisitionInformation/platformDocument"; } METADATA_DataQuality { String scope "NOT_SET"; String fullnamepath "/METADATA/DataQuality"; } METADATA_DataQuality_CompletenessOmission { String evaluationMethodType "directInternal"; String measureDescription "TBD"; String nameOfMeasure "TBD"; String unitofMeasure "TBD"; String value "NOT_SET"; String fullnamepath "/METADATA/DataQuality/CompletenessOmission"; } METADATA_DataQuality_DomainConsistency { String evaluationMethodType "directInternal"; String measureDescription "TBD"; String nameOfMeasure "TBD"; String unitofMeasure "TBD"; String value "NOT_SET"; String fullnamepath "/METADATA/DataQuality/DomainConsistency"; } METADATA_ProductSpecificationDocument { String ShortName "ATL06_SDP"; String characterSet "utf8"; String edition "v4.3"; String language "eng"; String publicationDate "Feb 2020"; String title "ICESat-2-SIPS-SPEC-4260 - ATLAS Science Algorithm Standard Data Product (SDP) Volume 5 (ATL06)."; String fullnamepath "/METADATA/ProductSpecificationDocument"; } METADATA_SeriesIdentification { String maintenanceAndUpdateFrequency "asNeeded"; String maintenanceDate "SET_BY_META"; String VersionID "004"; String language "eng"; String characterSet "utf8"; String pointOfContact "NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center"; String longName "ATLAS/ICESat-2 L3A Land Ice Height"; String shortName "ATL06"; String identifier_product_DOI "doi:10.5067/ATLAS/ATL06.004"; String revisionDate "2016-06-09"; String resourceProviderOrganizationName "National Aeronautics and Space Administration (NASA)"; String abstract "ATL06 provides estimates of the ice-sheet mean surface height relative to the WGS-84 ellipsoid, and ancillary parameters needed to interpret and assess the quality of these height estimates."; String purpose "ATL06 provides estimates of the ice-sheet mean surface height relative to the WGS-84 ellipsoid, and ancillary parameters needed to interpret and assess the quality of these height estimates."; String credit "The software that generates the ATL06 product was designed and implemented at the NASA Wallops Flight Facility in Wallops Island, Virginia."; String status "onGoing"; String format "HDF"; String formatVersion "5"; String topicCategory "geoscientificInformation"; String mission "ICESat-2 > Ice, Cloud, and land Elevation Satellite-2"; String fullnamepath "/METADATA/SeriesIdentification"; } METADATA_DatasetIdentification { String spatialRepresentationType "along-track"; String creationDate "2021-02-08T16:10:17.000000Z"; String uuid "26381e62-d915-3289-a51f-dc4c27d4348c"; String fileName "ATL06_20190223232535_08780212_004_01.h5"; String VersionID "004"; String language "eng"; String characterSet "utf8"; String shortName "ATL06"; String originatorOrganizationName "GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System"; String abstract "ATL06 provides estimates of the ice-sheet mean surface height relative to the WGS-84 ellipsoid, and ancillary parameters needed to interpret and assess the quality of these height estimates."; String purpose "ATL06 provides estimates of the ice-sheet mean surface height relative to the WGS-84 ellipsoid, and ancillary parameters needed to interpret and assess the quality of these height estimates."; String credit "The software that generates the ATL06 product was designed and implemented at the NASA Wallops Flight Facility in Wallops Island, Virginia."; String status "onGoing"; String topicCategory "geoscientificInformation"; String fullnamepath "/METADATA/DatasetIdentification"; } METADATA_Extent { Float64 northBoundLatitude -67.924997978629051; Float64 eastBoundLongitude 157.76718345631195; Float64 southBoundLatitude -79.006040991408540; Float64 westBoundLongitude 151.41357232464225; String rangeBeginningDateTime "2019-02-23T23:25:35.061232Z"; String rangeEndingDateTime "2019-02-23T23:28:32.341805Z"; String fullnamepath "/METADATA/Extent"; } METADATA_QADatasetIdentification { String abstract "An ASCII product that contains statistical information on data product results. These statistics enable data producers and users to assess the quality of the data in the data product granule"; String creationDate "2021-02-08T16:15:17.000000Z"; String fileName "ATL06_20190223232535_08780212_004_01.qa"; String fullnamepath "/METADATA/QADatasetIdentification"; } METADATA_Lineage { } METADATA_Lineage_ANC36_06 { String description "ISO 19139 XML file containing Series-level metadata information."; String fileName "ANC36-06_20210107160638_004_01.xml"; String shortName "ANC36-06"; String uuid "2e12b929-e926-3085-ad53-7411c4dec0c3"; String version "004"; String fullnamepath "/METADATA/Lineage/ANC36-06"; } METADATA_Lineage_Control { String description "Text-based keyword=value file generated automatically within the ICESat-2 data system that specifies all of the conditions required for each individual run of the software."; String fileName "CTL_atlas_l3a_is_005909506.ctl"; String shortName "CNTL"; String version "1"; String fullnamepath "/METADATA/Lineage/Control"; } METADATA_Lineage_ANC28 { String description "DTU Mean Sea Surface re-referenced to the WGS84 ellipsoid."; String fileName "dtu13_20180705_001_01.nc"; String shortName "ANC28"; String uuid "56f47040-a72e-3109-99c2-bc1658e6dda4"; String version "20180705"; String fullnamepath "/METADATA/Lineage/ANC28"; } METADATA_Lineage_ANC38_06 { String description "ISO 19139 XML file containing DataSet-level metadata information."; String fileName "ANC38-06_20210107160644_004_01.xml"; String shortName "ANC38-06"; String uuid "3f27f9c1-277d-3065-a27e-dd31ab5f654e"; String version "004"; String fullnamepath "/METADATA/Lineage/ANC38-06"; } METADATA_Lineage_ANC06_02 { String description "ArcticDEM 32m Digital Elevation Model reformatted into HDF5."; String fileName "arcticdem32m_20190611_001_01.h5"; String shortName "ANC06-02"; String uuid "ce07ef72-0bf4-353b-8475-fb568b029905"; String version "20190611"; String fullnamepath "/METADATA/Lineage/ANC06-02"; } METADATA_Lineage_ANC06_03 { String description "REMA Antarctica 100m Digital Elevation Model filled and reformatted into HDF5"; String fileName "atl06rema100m_20190628_001_01.h5"; String shortName "ANC06-03"; String uuid "3e0a81bd-bbd5-35fa-b868-3254f9355b7f"; String version "20190628"; String fullnamepath "/METADATA/Lineage/ANC06-03"; } METADATA_Lineage_ANC25_06 { String description "HDF5 template file that defines the organization and default content of the product."; String fileName "ANC25-06_20210107155830_044_01.h5"; String shortName "ANC25-06"; String uuid "0da80451-460b-3cd3-92e5-13d62f178156"; String version "044"; String fullnamepath "/METADATA/Lineage/ANC25-06"; } METADATA_Lineage_ANC17 { String description "Land Ice Height SNR Significance Table"; String fileName "anc17_snr_f_20170718_001_01.h5"; String shortName "ANC17"; String uuid "52fe4165-bac0-3dc9-a9b3-921a591a7dc5"; String version "20170718"; String fullnamepath "/METADATA/Lineage/ANC17"; } METADATA_Lineage_ANC26_06 { String description "HDF5 template file that defines the organization and default content of the product metadata."; String fileName "ANC26-06_20210107155837_044_01.h5"; String shortName "ANC26-06"; String uuid "335a9657-57e8-3bf7-9c4b-50a31d19bb06"; String version "044"; String fullnamepath "/METADATA/Lineage/ANC26-06"; } METADATA_Lineage_ATL03 { String description "ICESat-2 ATLAS L2A Global Geolocated Photon data products."; String fileName "ATL03_20190223232535_08780212_004_01.h5"; String shortName "ATL03"; String uuid "f1ad11c9-8328-33b8-b14b-6ed933df8fa6"; String version "004"; Int32 start_cycle 2; Int32 end_cycle 2; Int32 start_orbit 2466; Int32 end_orbit 2466; Int32 start_rgt 878; Int32 end_rgt 878; Int32 start_region 12; Int32 end_region 12; Int32 start_geoseg 1565344; Int32 end_geoseg 1728837; String fullnamepath "/METADATA/Lineage/ATL03"; } METADATA_Lineage_ATL09 { String description "ICESat-2 ATLAS L3A atmosphere data products."; String fileName "ATL09_20190223221203_08780201_004_01.h5"; String shortName "ATL09"; String uuid "15e87084-7688-34d8-93a0-0bfda1a0d7d7"; String version "004"; Int32 start_cycle 2; Int32 end_cycle 2; Int32 start_orbit 2466; Int32 end_orbit 2466; Int32 start_rgt 878; Int32 end_rgt 878; Int32 start_region 1; Int32 end_region 14; Int32 start_geoseg 15; Int32 end_geoseg 2007137; String fullnamepath "/METADATA/Lineage/ATL09"; } METADATA_Lineage_ANC06_01 { String description "MERIT 3 arcsec Digital Elevation Model reformatted into HDF5 and re-referenced to the WGS-84 ellipsoid."; String fileName "merit_3as_20200617_001_01.h5"; String shortName "ANC06-01"; String uuid "3db8ab65-d2ac-37c7-86db-17c762268673"; String version "20200617"; String fullnamepath "/METADATA/Lineage/ANC06-01"; } METADATA_Lineage_ANC19 { String description "TAI to UTC leapsecond file retrieved from ftp://maia.usno.navy.mil/ser7/tai-utc.dat"; String fileName "tai_utc_2017.dat"; String shortName "ANC19"; String uuid "7c66d365-278a-31f7-8fe4-9c80e2f012e5"; String version "001"; String fullnamepath "/METADATA/Lineage/ANC19"; } METADATA_ProcessStep { } METADATA_ProcessStep_Browse { String processDescription "Browse processing is performed for each granule SIPS produces. The browse utility reads data from the granule and produces browse images as defined in the respective product ATBD. The utility then embeds each browse image into the product within the /Browse group."; String identifier "atlas_brw"; String softwareVersion "Version 2.4.1"; String softwareDate "Jan 14 2021"; String softwareTitle "Creates ATLAS HDF5 browse files"; String runTimeParameters "CTL_atlas_l3a_is_005909506.ctl"; String stepDateTime "2021-02-08T16:15:22.000000Z"; String fullnamepath "/METADATA/ProcessStep/Browse"; } METADATA_ProcessStep_Metadata { String processDescription "Metadata information is processed by the metadata utility for each granule produced by SIPS. During PGE processing, dynamic metadata are written to the product. Additional static information is provided with the metadata template. The metadata utility reads ISO Dataset and Series metadata files and updates the product with static information from within those files. The utility then merges the static and dynamic metadata to creates output ISO19139 Dataset and Series XML files. Finally the utility reads the ISO19139 Dataset and Series XML files into memory and stores the textual representations as attributes attached to the /METADATA group."; String identifier "atlas_meta"; String softwareVersion "Version 4.4.1"; String softwareDate "Jan 14 2021"; String softwareTitle "Creates ATLAS XML metadata files"; String runTimeParameters "CTL_atlas_l3a_is_005909506.ctl"; String stepDateTime "2021-02-08T16:15:34.000000Z"; String fullnamepath "/METADATA/ProcessStep/Metadata"; } METADATA_ProcessStep_PGE { String ATBDDate "12/04/2019"; String ATBDTitle "Algorithm Theoretical Basis Document (ATBD) For Land-Ice Along-Track Products Part 2: Land-ice H(t)/ATL11"; String ATBDVersion "N/A"; String documentDate "Feb 2020"; String documentation "ATLAS Science Algorithm Software Design Description (SDD) - Volume 9 (atlas_l3a_is)"; String processDescription "Computes surface heights for each beam, along and across-track slopes calculated for beam pairs."; String identifier "atlas_l3a_is"; String softwareVersion "Version 4.4.1"; String softwareDate "Jan 14 2021"; String softwareTitle "ASAS L3A Icesheet PGE"; String runTimeParameters "CTL_atlas_l3a_is_005909506.ctl"; String stepDateTime "2021-02-08T16:10:17.000000Z"; String fullnamepath "/METADATA/ProcessStep/PGE"; } METADATA_ProcessStep_QA { String processDescription "QA processing is performed by an external utility on each granule produced by SIPS. The utility reads the granule, performs both generic and product-specific quality-assessment calculations, and writes a text-based quality assessment report. The name and creation data of this report are identified within the QADatasetIdentification metadata"; String identifier "atl06_qa_util"; String softwareVersion "Version 4.4"; String softwareDate "Oct 29 2020"; String softwareTitle "ATL06 QA Utility"; String runTimeParameters "CTL_atlas_l3a_is_005909506.ctl"; String stepDateTime "2021-02-08T16:15:17.000000Z"; String fullnamepath "/METADATA/ProcessStep/QA"; } gt1r { String Description "Contains subgroups organized by Ground Track (gt1l, gt1r, gt2l, gt2r, gt3l and gt3r)"; String atlas_pce "pce1"; String atlas_beam_type "weak"; String groundtrack_id "gt1r"; String atmosphere_profile "profile_1"; String atlas_spot_number "2"; String sc_orientation "Backward"; String fullnamepath "/gt1r"; } gt1r_land_ice_segments { String Description "The land_ice_height group contains the primary set of derived ATL06 products. This includes geolocation, height, and standard error and quality measures for each segment. This group is sparse, meaning that parameters are provided only for pairs of segments for which at least one beam has a valid surface-height measurement."; String data_rate "Data within this group are sparse. Data values are provided only for those ICESat-2 20m segments where at least one beam has a valid land ice height measurement."; String fullnamepath "/gt1r/land_ice_segments"; } gt1r_land_ice_segments_fit_statistics { String Description "The fit_statistics subgroup contains a variety of parameters that might indicate the quality of the fitted segment data. Data in this group are sparse, with dimensions matching the land_ice_height group."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt1r/land_ice_segments/fit_statistics"; } gt1r_land_ice_segments_ground_track { String Description "The ground_track group contains parameters describing the GT and RGT for each land ice segment, as well as angular information about the beams."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt1r/land_ice_segments/ground_track"; } gt1r_land_ice_segments_dem { String Description "Contains reference DEM and geoid heights."; String data_rate "Data within this group are stored at the land_ice segment rate."; String fullnamepath "/gt1r/land_ice_segments/dem"; } gt1r_land_ice_segments_geophysical { String Description "The sun_and_clouds group contains parameters related to solar background and parameters indicative of the presence or absence of clouds."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt1r/land_ice_segments/geophysical"; } gt1r_land_ice_segments_bias_correction { String Description "The bias_correction group contains information about the estimated first-photon bias, and the transmit-pulse-shape bias."; String data_rate "Data within this group are stored at the land_ice segment rate."; String fullnamepath "/gt1r/land_ice_segments/bias_correction"; } gt1r_residual_histogram { String Description "This group contains histograms of the residuals between PE heights and the least-squares fit segment heights, at 200-meter along-track resolution."; String data_rate "Data within this group are stored at the 200-meter along-track rate."; String fullnamepath "/gt1r/residual_histogram"; } gt1r_segment_quality { String Description "The segment_quality group contains a dense record (i.e. for every possible segment in the granule) of the success or failure of the surface-finding strategies, and gives the locations of the reference points on the RPTs. For segments with adequate data quality (i.e. with more than 10 PE) it also contains offsets into the data structures for the other groups that allow each segment to be efficiently located within the file."; String data_rate "Data within this group are stored at the ICESat-2 20m segment rate."; String fullnamepath "/gt1r/segment_quality"; } gt1r_segment_quality_signal_selection_status { String Description "The signal selection status subgroup contains the success or failure for each surface-finding strategies"; String data_rate "Data within this group are stored at the ICESat-2 20m segment rate."; String fullnamepath "/gt1r/segment_quality/signal_selection_status"; } gt2r { String Description "Contains subgroups organized by Ground Track (gt1l, gt1r, gt2l, gt2r, gt3l and gt3r)"; String atlas_pce "pce2"; String atlas_beam_type "weak"; String groundtrack_id "gt2r"; String atmosphere_profile "profile_2"; String atlas_spot_number "4"; String sc_orientation "Backward"; String fullnamepath "/gt2r"; } gt2r_land_ice_segments { String Description "The land_ice_height group contains the primary set of derived ATL06 products. This includes geolocation, height, and standard error and quality measures for each segment. This group is sparse, meaning that parameters are provided only for pairs of segments for which at least one beam has a valid surface-height measurement."; String data_rate "Data within this group are sparse. Data values are provided only for those ICESat-2 20m segments where at least one beam has a valid land ice height measurement."; String fullnamepath "/gt2r/land_ice_segments"; } gt2r_land_ice_segments_fit_statistics { String Description "The fit_statistics subgroup contains a variety of parameters that might indicate the quality of the fitted segment data. Data in this group are sparse, with dimensions matching the land_ice_height group."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt2r/land_ice_segments/fit_statistics"; } gt2r_land_ice_segments_ground_track { String Description "The ground_track group contains parameters describing the GT and RGT for each land ice segment, as well as angular information about the beams."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt2r/land_ice_segments/ground_track"; } gt2r_land_ice_segments_dem { String Description "Contains reference DEM and geoid heights."; String data_rate "Data within this group are stored at the land_ice segment rate."; String fullnamepath "/gt2r/land_ice_segments/dem"; } gt2r_land_ice_segments_geophysical { String Description "The sun_and_clouds group contains parameters related to solar background and parameters indicative of the presence or absence of clouds."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt2r/land_ice_segments/geophysical"; } gt2r_land_ice_segments_bias_correction { String Description "The bias_correction group contains information about the estimated first-photon bias, and the transmit-pulse-shape bias."; String data_rate "Data within this group are stored at the land_ice segment rate."; String fullnamepath "/gt2r/land_ice_segments/bias_correction"; } gt2r_residual_histogram { String Description "This group contains histograms of the residuals between PE heights and the least-squares fit segment heights, at 200-meter along-track resolution."; String data_rate "Data within this group are stored at the 200-meter along-track rate."; String fullnamepath "/gt2r/residual_histogram"; } gt2r_segment_quality { String Description "The segment_quality group contains a dense record (i.e. for every possible segment in the granule) of the success or failure of the surface-finding strategies, and gives the locations of the reference points on the RPTs. For segments with adequate data quality (i.e. with more than 10 PE) it also contains offsets into the data structures for the other groups that allow each segment to be efficiently located within the file."; String data_rate "Data within this group are stored at the ICESat-2 20m segment rate."; String fullnamepath "/gt2r/segment_quality"; } gt2r_segment_quality_signal_selection_status { String Description "The signal selection status subgroup contains the success or failure for each surface-finding strategies"; String data_rate "Data within this group are stored at the ICESat-2 20m segment rate."; String fullnamepath "/gt2r/segment_quality/signal_selection_status"; } gt1l { String Description "Contains subgroups organized by Ground Track (gt1l, gt1r, gt2l, gt2r, gt3l and gt3r)"; String atlas_pce "pce1"; String atlas_beam_type "strong"; String groundtrack_id "gt1l"; String atmosphere_profile "profile_1"; String atlas_spot_number "1"; String sc_orientation "Backward"; String fullnamepath "/gt1l"; } gt1l_land_ice_segments { String Description "The land_ice_height group contains the primary set of derived ATL06 products. This includes geolocation, height, and standard error and quality measures for each segment. This group is sparse, meaning that parameters are provided only for pairs of segments for which at least one beam has a valid surface-height measurement."; String data_rate "Data within this group are sparse. Data values are provided only for those ICESat-2 20m segments where at least one beam has a valid land ice height measurement."; String fullnamepath "/gt1l/land_ice_segments"; } gt1l_land_ice_segments_fit_statistics { String Description "The fit_statistics subgroup contains a variety of parameters that might indicate the quality of the fitted segment data. Data in this group are sparse, with dimensions matching the land_ice_height group."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt1l/land_ice_segments/fit_statistics"; } gt1l_land_ice_segments_ground_track { String Description "The ground_track group contains parameters describing the GT and RGT for each land ice segment, as well as angular information about the beams."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt1l/land_ice_segments/ground_track"; } gt1l_land_ice_segments_dem { String Description "Contains reference DEM and geoid heights."; String data_rate "Data within this group are stored at the land_ice segment rate."; String fullnamepath "/gt1l/land_ice_segments/dem"; } gt1l_land_ice_segments_geophysical { String Description "The sun_and_clouds group contains parameters related to solar background and parameters indicative of the presence or absence of clouds."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt1l/land_ice_segments/geophysical"; } gt1l_land_ice_segments_bias_correction { String Description "The bias_correction group contains information about the estimated first-photon bias, and the transmit-pulse-shape bias."; String data_rate "Data within this group are stored at the land_ice segment rate."; String fullnamepath "/gt1l/land_ice_segments/bias_correction"; } gt1l_residual_histogram { String Description "This group contains histograms of the residuals between PE heights and the least-squares fit segment heights, at 200-meter along-track resolution."; String data_rate "Data within this group are stored at the 200-meter along-track rate."; String fullnamepath "/gt1l/residual_histogram"; } gt1l_segment_quality { String Description "The segment_quality group contains a dense record (i.e. for every possible segment in the granule) of the success or failure of the surface-finding strategies, and gives the locations of the reference points on the RPTs. For segments with adequate data quality (i.e. with more than 10 PE) it also contains offsets into the data structures for the other groups that allow each segment to be efficiently located within the file."; String data_rate "Data within this group are stored at the ICESat-2 20m segment rate."; String fullnamepath "/gt1l/segment_quality"; } gt1l_segment_quality_signal_selection_status { String Description "The signal selection status subgroup contains the success or failure for each surface-finding strategies"; String data_rate "Data within this group are stored at the ICESat-2 20m segment rate."; String fullnamepath "/gt1l/segment_quality/signal_selection_status"; } quality_assessment { String Description "Contains quality assessment data. This may include QA counters, QA along-track data and/or QA summary data."; String fullnamepath "/quality_assessment"; } quality_assessment_gt1r { String Description "Contains quality assessment data. This may include QA counters, QA along-track data and/or QA summary data."; String fullnamepath "/quality_assessment/gt1r"; } quality_assessment_gt2r { String Description "Contains quality assessment data. This may include QA counters, QA along-track data and/or QA summary data."; String fullnamepath "/quality_assessment/gt2r"; } quality_assessment_gt1l { String Description "Contains quality assessment data. This may include QA counters, QA along-track data and/or QA summary data."; String fullnamepath "/quality_assessment/gt1l"; } quality_assessment_gt3l { String Description "Contains quality assessment data. This may include QA counters, QA along-track data and/or QA summary data."; String fullnamepath "/quality_assessment/gt3l"; } quality_assessment_gt2l { String Description "Contains quality assessment data. This may include QA counters, QA along-track data and/or QA summary data."; String fullnamepath "/quality_assessment/gt2l"; } quality_assessment_gt3r { String Description "Contains quality assessment data. This may include QA counters, QA along-track data and/or QA summary data."; String fullnamepath "/quality_assessment/gt3r"; } gt3l { String Description "Contains subgroups organized by Ground Track (gt1l, gt1r, gt2l, gt2r, gt3l and gt3r)"; String atlas_pce "pce3"; String atlas_beam_type "strong"; String groundtrack_id "gt3l"; String atmosphere_profile "profile_3"; String atlas_spot_number "5"; String sc_orientation "Backward"; String fullnamepath "/gt3l"; } gt3l_land_ice_segments { String Description "The land_ice_height group contains the primary set of derived ATL06 products. This includes geolocation, height, and standard error and quality measures for each segment. This group is sparse, meaning that parameters are provided only for pairs of segments for which at least one beam has a valid surface-height measurement."; String data_rate "Data within this group are sparse. Data values are provided only for those ICESat-2 20m segments where at least one beam has a valid land ice height measurement."; String fullnamepath "/gt3l/land_ice_segments"; } gt3l_land_ice_segments_fit_statistics { String Description "The fit_statistics subgroup contains a variety of parameters that might indicate the quality of the fitted segment data. Data in this group are sparse, with dimensions matching the land_ice_height group."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt3l/land_ice_segments/fit_statistics"; } gt3l_land_ice_segments_ground_track { String Description "The ground_track group contains parameters describing the GT and RGT for each land ice segment, as well as angular information about the beams."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt3l/land_ice_segments/ground_track"; } gt3l_land_ice_segments_dem { String Description "Contains reference DEM and geoid heights."; String data_rate "Data within this group are stored at the land_ice segment rate."; String fullnamepath "/gt3l/land_ice_segments/dem"; } gt3l_land_ice_segments_geophysical { String Description "The sun_and_clouds group contains parameters related to solar background and parameters indicative of the presence or absence of clouds."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt3l/land_ice_segments/geophysical"; } gt3l_land_ice_segments_bias_correction { String Description "The bias_correction group contains information about the estimated first-photon bias, and the transmit-pulse-shape bias."; String data_rate "Data within this group are stored at the land_ice segment rate."; String fullnamepath "/gt3l/land_ice_segments/bias_correction"; } gt3l_residual_histogram { String Description "This group contains histograms of the residuals between PE heights and the least-squares fit segment heights, at 200-meter along-track resolution."; String data_rate "Data within this group are stored at the 200-meter along-track rate."; String fullnamepath "/gt3l/residual_histogram"; } gt3l_segment_quality { String Description "The segment_quality group contains a dense record (i.e. for every possible segment in the granule) of the success or failure of the surface-finding strategies, and gives the locations of the reference points on the RPTs. For segments with adequate data quality (i.e. with more than 10 PE) it also contains offsets into the data structures for the other groups that allow each segment to be efficiently located within the file."; String data_rate "Data within this group are stored at the ICESat-2 20m segment rate."; String fullnamepath "/gt3l/segment_quality"; } gt3l_segment_quality_signal_selection_status { String Description "The signal selection status subgroup contains the success or failure for each surface-finding strategies"; String data_rate "Data within this group are stored at the ICESat-2 20m segment rate."; String fullnamepath "/gt3l/segment_quality/signal_selection_status"; } gt2l { String Description "Contains subgroups organized by Ground Track (gt1l, gt1r, gt2l, gt2r, gt3l and gt3r)"; String atlas_pce "pce2"; String atlas_beam_type "strong"; String groundtrack_id "gt2l"; String atmosphere_profile "profile_2"; String atlas_spot_number "3"; String sc_orientation "Backward"; String fullnamepath "/gt2l"; } gt2l_land_ice_segments { String Description "The land_ice_height group contains the primary set of derived ATL06 products. This includes geolocation, height, and standard error and quality measures for each segment. This group is sparse, meaning that parameters are provided only for pairs of segments for which at least one beam has a valid surface-height measurement."; String data_rate "Data within this group are sparse. Data values are provided only for those ICESat-2 20m segments where at least one beam has a valid land ice height measurement."; String fullnamepath "/gt2l/land_ice_segments"; } gt2l_land_ice_segments_fit_statistics { String Description "The fit_statistics subgroup contains a variety of parameters that might indicate the quality of the fitted segment data. Data in this group are sparse, with dimensions matching the land_ice_height group."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt2l/land_ice_segments/fit_statistics"; } gt2l_land_ice_segments_ground_track { String Description "The ground_track group contains parameters describing the GT and RGT for each land ice segment, as well as angular information about the beams."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt2l/land_ice_segments/ground_track"; } gt2l_land_ice_segments_dem { String Description "Contains reference DEM and geoid heights."; String data_rate "Data within this group are stored at the land_ice segment rate."; String fullnamepath "/gt2l/land_ice_segments/dem"; } gt2l_land_ice_segments_geophysical { String Description "The sun_and_clouds group contains parameters related to solar background and parameters indicative of the presence or absence of clouds."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt2l/land_ice_segments/geophysical"; } gt2l_land_ice_segments_bias_correction { String Description "The bias_correction group contains information about the estimated first-photon bias, and the transmit-pulse-shape bias."; String data_rate "Data within this group are stored at the land_ice segment rate."; String fullnamepath "/gt2l/land_ice_segments/bias_correction"; } gt2l_residual_histogram { String Description "This group contains histograms of the residuals between PE heights and the least-squares fit segment heights, at 200-meter along-track resolution."; String data_rate "Data within this group are stored at the 200-meter along-track rate."; String fullnamepath "/gt2l/residual_histogram"; } gt2l_segment_quality { String Description "The segment_quality group contains a dense record (i.e. for every possible segment in the granule) of the success or failure of the surface-finding strategies, and gives the locations of the reference points on the RPTs. For segments with adequate data quality (i.e. with more than 10 PE) it also contains offsets into the data structures for the other groups that allow each segment to be efficiently located within the file."; String data_rate "Data within this group are stored at the ICESat-2 20m segment rate."; String fullnamepath "/gt2l/segment_quality"; } gt2l_segment_quality_signal_selection_status { String Description "The signal selection status subgroup contains the success or failure for each surface-finding strategies"; String data_rate "Data within this group are stored at the ICESat-2 20m segment rate."; String fullnamepath "/gt2l/segment_quality/signal_selection_status"; } ancillary_data { String Description "Contains information ancillary to the data product. This may include product characteristics, instrument characteristics and/or processing constants."; String data_rate "Data within this group pertain to the granule in its entirety."; String fullnamepath "/ancillary_data"; } ancillary_data_land_ice { String Description "Contains land-ice-specific information ancillary to the data product. This may include product characteristics, instrument characteristics and/or processing constants."; String fullnamepath "/ancillary_data/land_ice"; } gt3r { String Description "Contains subgroups organized by Ground Track (gt1l, gt1r, gt2l, gt2r, gt3l and gt3r)"; String atlas_pce "pce3"; String atlas_beam_type "weak"; String groundtrack_id "gt3r"; String atmosphere_profile "profile_3"; String atlas_spot_number "6"; String sc_orientation "Backward"; String fullnamepath "/gt3r"; } gt3r_land_ice_segments { String Description "The land_ice_height group contains the primary set of derived ATL06 products. This includes geolocation, height, and standard error and quality measures for each segment. This group is sparse, meaning that parameters are provided only for pairs of segments for which at least one beam has a valid surface-height measurement."; String data_rate "Data within this group are sparse. Data values are provided only for those ICESat-2 20m segments where at least one beam has a valid land ice height measurement."; String fullnamepath "/gt3r/land_ice_segments"; } gt3r_land_ice_segments_fit_statistics { String Description "The fit_statistics subgroup contains a variety of parameters that might indicate the quality of the fitted segment data. Data in this group are sparse, with dimensions matching the land_ice_height group."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt3r/land_ice_segments/fit_statistics"; } gt3r_land_ice_segments_ground_track { String Description "The ground_track group contains parameters describing the GT and RGT for each land ice segment, as well as angular information about the beams."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt3r/land_ice_segments/ground_track"; } gt3r_land_ice_segments_dem { String Description "Contains reference DEM and geoid heights."; String data_rate "Data within this group are stored at the land_ice segment rate."; String fullnamepath "/gt3r/land_ice_segments/dem"; } gt3r_land_ice_segments_geophysical { String Description "The sun_and_clouds group contains parameters related to solar background and parameters indicative of the presence or absence of clouds."; String data_rate "Data within this group are stored at the land_ice_height segment rate."; String fullnamepath "/gt3r/land_ice_segments/geophysical"; } gt3r_land_ice_segments_bias_correction { String Description "The bias_correction group contains information about the estimated first-photon bias, and the transmit-pulse-shape bias."; String data_rate "Data within this group are stored at the land_ice segment rate."; String fullnamepath "/gt3r/land_ice_segments/bias_correction"; } gt3r_residual_histogram { String Description "This group contains histograms of the residuals between PE heights and the least-squares fit segment heights, at 200-meter along-track resolution."; String data_rate "Data within this group are stored at the 200-meter along-track rate."; String fullnamepath "/gt3r/residual_histogram"; } gt3r_segment_quality { String Description "The segment_quality group contains a dense record (i.e. for every possible segment in the granule) of the success or failure of the surface-finding strategies, and gives the locations of the reference points on the RPTs. For segments with adequate data quality (i.e. with more than 10 PE) it also contains offsets into the data structures for the other groups that allow each segment to be efficiently located within the file."; String data_rate "Data within this group are stored at the ICESat-2 20m segment rate."; String fullnamepath "/gt3r/segment_quality"; } gt3r_segment_quality_signal_selection_status { String Description "The signal selection status subgroup contains the success or failure for each surface-finding strategies"; String data_rate "Data within this group are stored at the ICESat-2 20m segment rate."; String fullnamepath "/gt3r/segment_quality/signal_selection_status"; } orbit_info_cycle_number { String long_name "Cycle Number"; String units "counts"; String source "POD/PPD"; Int16 valid_min 0; Int16 valid_max 50; String contentType "referenceInformation"; String description "Tracks the number of 91-day cycles in the mission, beginning with 01. A unique orbit number can be determined by subtracting 1 from the cycle_number, multiplying by 1387 and adding the rgt value."; String origname "cycle_number"; String fullnamepath "/orbit_info/cycle_number"; String coordinates "orbit_info_crossing_time"; } orbit_info_orbit_number { String long_name "Orbit Number"; String units "1"; String source "Operations"; UInt16 valid_min 1; UInt16 valid_max 65000; String contentType "referenceInformation"; String description "Unique identifying number for each planned ICESat-2 orbit."; String origname "orbit_number"; String fullnamepath "/orbit_info/orbit_number"; String coordinates "orbit_info_crossing_time"; } orbit_info_lan { String long_name "Ascending Node Longitude"; String units "degrees_east"; String source "POD/PPD"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "referenceInformation"; String description "Longitude at the ascending node crossing."; String origname "lan"; String fullnamepath "/orbit_info/lan"; String coordinates "orbit_info_crossing_time"; } orbit_info_sc_orient { String long_name "Spacecraft Orientation"; String units "1"; String source "POD/PPD"; Int16 valid_min 0; Int16 valid_max 2; String contentType "referenceInformation"; String description "This parameter tracks the spacecraft orientation between forward, backward and transitional flight modes. ICESat-2 is considered to be flying forward when the weak beams are leading the strong beams; and backward when the strong beams are leading the weak beams. ICESat-2 is considered to be in transition while it is maneuvering between the two orientations. Science quality is potentially degraded while in transition mode."; String flag_meanings "backward forward transition"; Int16 flag_values 0, 1, 2; String origname "sc_orient"; String fullnamepath "/orbit_info/sc_orient"; String coordinates "orbit_info_sc_orient_time"; } orbit_info_rgt { String long_name "Reference Ground track"; String units "counts"; String source "POD/PPD"; Int16 valid_min 1; Int16 valid_max 1387; String contentType "referenceInformation"; String description "The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT2L and GT2R. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs."; String origname "rgt"; String fullnamepath "/orbit_info/rgt"; String coordinates "orbit_info_crossing_time"; } gt1r_land_ice_segments_sigma_geo_h { Float32 _FillValue 3.402823466e+38; String long_name "Vertical Geolocation Error"; String units "meters"; String source "ATBD Section 3.10"; String contentType "qualityInformation"; String description "Total vertical geolocation error due to PPD and POD, including the effects of horizontal geolocation error on the segment vertical error."; String origname "sigma_geo_h"; String fullnamepath "/gt1r/land_ice_segments/sigma_geo_h"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_h_li_sigma { Float32 _FillValue 3.402823466e+38; String long_name "Expected RMS segment misfit"; String units "meters"; String source "section 4.4"; String contentType "qualityInformation"; String description "Propagated error due to sampling error and FPB correction from the land ice algorithm"; String origname "h_li_sigma"; String fullnamepath "/gt1r/land_ice_segments/h_li_sigma"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_h_mean { Float32 _FillValue 3.402823466e+38; String long_name "Height Mean"; String units "meters"; String source "ATL06 ATBD"; String contentType "modelResult"; String description "Mean surface height, not corrected for first-photon bias or pulse truncation."; String origname "h_mean"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/h_mean"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_signal_selection_source { String long_name "Signal Selection Source"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 2=Signal selection failed using all flagged ATL03 PE, but succeeded using the backup algorithm; 3=All signal-finding strategies failed."; String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_source"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/signal_selection_source"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_snr { Float32 _FillValue 3.402823466e+38; String long_name "SNR"; String units "1"; String source "section 3.6.2"; String contentType "physicalMeasurement"; String description "Signal-to-noise ratio in the final refined window"; String origname "snr"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/snr"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_h_robust_sprd { Float32 _FillValue 3.402823466e+38; String long_name "Robust Spread"; String units "meters"; String source "section 3.6.3"; String contentType "referenceInformation"; String description "RDE of misfit between PE heights and the along-track segment fit."; String origname "h_robust_sprd"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/h_robust_sprd"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_n_seg_pulses { String units "counts"; Float32 _FillValue 3.402823466e+38; String long_name "Number potential segment pulses"; String source "section 3.3.3"; String contentType "referenceInformation"; String description "The number of pulses potentially included in the segment"; String origname "n_seg_pulses"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/n_seg_pulses"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_dh_fit_dx_sigma { Float32 _FillValue 3.402823466e+38; String long_name "Sigma of Along Track Slope"; String units "meters/meters"; String source "section 3.6.4"; String contentType "qualityInformation"; String description "Propagated error in the along-track segment slope"; String origname "dh_fit_dx_sigma"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/dh_fit_dx_sigma"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_snr_significance { Float32 _FillValue 3.402823466e+38; String long_name "SNR Significance"; String units "1"; String source "section 3.6.2"; String contentType "physicalMeasurement"; String description "Probability that signal-finding routine would converge to at least the observed SNR for a random-noise input. Small values indicate a small likelihood of a surface-detection blunder."; String origname "snr_significance"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/snr_significance"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_h_expected_rms { Float32 _FillValue 3.402823466e+38; String long_name "Expected RMS misfit"; String units "meters"; String source "section 3.6.3"; String contentType "qualityInformation"; String description "Expected RMS misfit between PE heights and along-track segment fit"; String origname "h_expected_rms"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/h_expected_rms"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_dh_fit_dy { Float32 _FillValue 3.402823466e+38; String long_name "Across Track Slope"; String units "meters/meters"; String source "section 3.7"; String contentType "physicalMeasurement"; String description "Across track slope from segment fits to weak and strong beam; the same slope is reported for both laser beams in each pair"; String origname "dh_fit_dy"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/dh_fit_dy"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_sigma_h_mean { Float32 _FillValue 3.402823466e+38; String long_name "Height Error"; String units "meters"; String source "section 3.6.4"; String contentType "qualityInformation"; String description "Propagated height error due to PE-height sampling error for height from the along-track fit, not including geolocation-induced error"; String origname "sigma_h_mean"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/sigma_h_mean"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_h_rms_misfit { Float32 _FillValue 3.402823466e+38; String long_name "RMS Misfit"; String units "meters"; String source "section 3.6.3"; String contentType "qualityInformation"; String description "RMS misfit between PE heights and along- track segment fit"; String origname "h_rms_misfit"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/h_rms_misfit"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_signal_selection_source_status { String long_name "Signal Selection Source Status"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 4; String contentType "qualityInformation"; String description "Indicates the status of the last signal selection algorithm attempted (see signal_selection_source). The definition of flag is different for each source and are defined in each of the signal_selection_status flags. (See Land Ice ATBD Table 3-2)."; String origname "signal_selection_source_status"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/signal_selection_source_status"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_dh_fit_dx { Float32 _FillValue 3.402823466e+38; String long_name "Along Track Slope"; String units "meters/meters"; String source "section 3.3.5.1"; String contentType "physicalMeasurement"; String description "Along-track slope from along-track segment fit"; String origname "dh_fit_dx"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/dh_fit_dx"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_n_fit_photons { Int32 _FillValue 2147483647; String long_name "Number of Photons in Fit"; String units "1"; String source "section 3.3.5.2"; String contentType "physicalMeasurement"; String description "Number of PEs used in determining h_li, after editing"; String origname "n_fit_photons"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/n_fit_photons"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_fit_statistics_w_surface_window_final { Float32 _FillValue 3.402823466e+38; String long_name "Surface Window Width"; String units "meters"; String source "section 3.3.5.2"; String contentType "physicalMeasurement"; String description "Width of the surface window, top to bottom"; String origname "w_surface_window_final"; String fullnamepath "/gt1r/land_ice_segments/fit_statistics/w_surface_window_final"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_longitude { String long_name "Longitude"; String standard_name "longitude"; String units "degrees_east"; String source "section 3.10"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Longitude of segment center, , WGS84, East=+"; String origname "longitude"; String fullnamepath "/gt1r/land_ice_segments/longitude"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude"; } gt1r_land_ice_segments_latitude { String long_name "Latitude"; String standard_name "latitude"; String units "degrees_north"; String source "section 3.10"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Latitude of segment center, WGS84, North=+,"; String origname "latitude"; String fullnamepath "/gt1r/land_ice_segments/latitude"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_h_li { Float32 _FillValue 3.402823466e+38; String long_name "Land Ice height"; String units "meters"; String source "section 4.4"; String contentType "physicalMeasurement"; String description "Standard land-ice segment height determined by land ice algorithm, corrected for first-photon bias, representing the median- based height of the selected PEs"; String origname "h_li"; String fullnamepath "/gt1r/land_ice_segments/h_li"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_ground_track_ref_azimuth { String units "radians"; Float32 _FillValue 3.402823466e+38; String long_name "Azimuth"; String source "ATL03g, Section 3.3"; String contentType "referenceInformation"; String description "The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft)."; String origname "ref_azimuth"; String fullnamepath "/gt1r/land_ice_segments/ground_track/ref_azimuth"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_ground_track_seg_azimuth { Float32 _FillValue 3.402823466e+38; String long_name "Segment Azimuth"; String units "degrees"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "Azimuth of the pair-track, east of local north."; String origname "seg_azimuth"; String fullnamepath "/gt1r/land_ice_segments/ground_track/seg_azimuth"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_ground_track_sigma_geo_at { Float32 _FillValue 3.402823466e+38; String long_name "Along Track Geolocation Error"; String units "meters"; String source "section 3.10"; String contentType "qualityInformation"; String description "Along-track component of the geolocation error."; String origname "sigma_geo_at"; String fullnamepath "/gt1r/land_ice_segments/ground_track/sigma_geo_at"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_ground_track_sigma_geo_r { Float32 _FillValue 3.402823466e+38; String long_name "Radial Orbit Error"; String units "meters"; String source "ATBD Section 3.10, (ATL03 sigma_h)"; String contentType "qualityInformation"; String description "Radial orbit component of the geolocation error."; String origname "sigma_geo_r"; String fullnamepath "/gt1r/land_ice_segments/ground_track/sigma_geo_r"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_ground_track_ref_coelv { Float32 _FillValue 3.402823466e+38; String long_name "Co-elevation"; String units "radians"; String source "ATL03g, Section 3.3"; String contentType "referenceInformation"; String description "Coelevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot."; String origname "ref_coelv"; String fullnamepath "/gt1r/land_ice_segments/ground_track/ref_coelv"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_ground_track_sigma_geo_xt { Float32 _FillValue 3.402823466e+38; String long_name "Across Track Geolocation Error"; String units "meters"; String source "section 3.10"; String contentType "qualityInformation"; String description "Across-track component of the geolocation error."; String origname "sigma_geo_xt"; String fullnamepath "/gt1r/land_ice_segments/ground_track/sigma_geo_xt"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_ground_track_x_atc { Float64 _FillValue 1.7976931348623157e+308; String long_name "X Along Track"; String units "meters"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "The along-track x-coordinate of the segment, measured parallel to the RGT, measured from the ascending node of the equatorial crossing of a given RGT."; String origname "x_atc"; String fullnamepath "/gt1r/land_ice_segments/ground_track/x_atc"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_ground_track_y_atc { Float32 _FillValue 3.402823466e+38; String long_name "Y Along Track"; String units "meters"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "Along-track y coordinate of the segment, relative to the RGT, measured along the perpendicular to the RGT, positive to the right of the RGT."; String origname "y_atc"; String fullnamepath "/gt1r/land_ice_segments/ground_track/y_atc"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_dem_dem_flag { String long_name "DEM Source Flag"; String units "1"; String source "ATL03"; Int16 valid_min 0; Int16 valid_max 4; String contentType "referenceInformation"; String description "Indicates source of the DEM height. Values: 0=None, 1=Arctic, 2=Global, 3=MSS, 4=Antarctic."; String flag_meanings "none arctic global mss antarctic"; Int16 flag_values 0, 1, 2, 3, 4; String origname "dem_flag"; String fullnamepath "/gt1r/land_ice_segments/dem/dem_flag"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_dem_geoid_free2mean { Float32 _FillValue 3.402823466e+38; String long_name "Geoid Free-to-Mean conversion"; String units "meters"; String source "ATL03"; String contentType "modelResult"; String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system. (Add to geoid to get the geoid heights in the mean-tide system.)"; String origname "geoid_free2mean"; String fullnamepath "/gt1r/land_ice_segments/dem/geoid_free2mean"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_dem_dem_h { Float32 _FillValue 3.402823466e+38; String long_name "DEM Height"; String units "meters"; String source "ATL06 ATBD"; String contentType "referenceInformation"; String description "Height of the DEM, interpolated by cubic-spline interpolation in the DEM coordinate system to the PE location. (Best available DEM value in priority of Arctic/Antarctic/Global/MSS)"; String origname "dem_h"; String fullnamepath "/gt1r/land_ice_segments/dem/dem_h"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_dem_geoid_h { Float32 _FillValue 3.402823466e+38; String long_name "Geoid Height"; String units "meters"; String source "EGM2008"; String contentType "referenceInformation"; String description "Geoid height above WGS-84 reference ellipsoid (range -107 to 86m) in the tide-free system."; String origname "geoid_h"; String fullnamepath "/gt1r/land_ice_segments/dem/geoid_h"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_msw_flag { Int16 _FillValue 127; String long_name "Multiple Scattering Warning Flag"; String units "1"; String source "ATL09"; Int16 valid_min -1; Int16 valid_max 5; String contentType "referenceInformation"; String description "Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight."; String flag_meanings "cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5"; Int16 flag_values -1, 0, 1, 2, 3, 4, 5; String origname "msw_flag"; String fullnamepath "/gt1r/land_ice_segments/geophysical/msw_flag"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_layer_flag { String units "1"; String source "ATL09"; Int16 _FillValue 127; String long_name "Consolidated cloud flag"; Int16 valid_min 0; Int16 valid_max 1; String contentType "referenceInformation"; String description "This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow."; String flag_meanings "likely_clear likely_cloudy"; Int16 flag_values 0, 1; String origname "layer_flag"; String fullnamepath "/gt1r/land_ice_segments/geophysical/layer_flag"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_bsnow_conf { Int16 _FillValue 127; String long_name "Blowing Snow confidence"; String units "1"; String source "ATL09"; String contentType "referenceInformation"; String description "Confidence flag for presence of blowing snow"; String origname "bsnow_conf"; String fullnamepath "/gt1r/land_ice_segments/geophysical/bsnow_conf"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_bsnow_h { Float32 _FillValue 3.402823466e+38; String long_name "Blowing Snow Layer Top Height"; String units "meters"; String source "ATL09"; String contentType "referenceInformation"; String description "Blowing snow layer top height"; String origname "bsnow_h"; String fullnamepath "/gt1r/land_ice_segments/geophysical/bsnow_h"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_tide_ocean { Float32 _FillValue 3.402823466e+38; String long_name "Ocean Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.1"; String contentType "referenceInformation"; String description "Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium)."; String origname "tide_ocean"; String fullnamepath "/gt1r/land_ice_segments/geophysical/tide_ocean"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_tide_earth { Float32 _FillValue 3.402823466e+38; String long_name "Earth Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.3"; String contentType "referenceInformation"; String description "Solid earth tides in the tide-free system."; String origname "tide_earth"; String fullnamepath "/gt1r/land_ice_segments/geophysical/tide_earth"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_solar_azimuth { Float32 _FillValue 3.402823466e+38; String long_name "solar azimuth"; String units "degrees_east"; String source "ATL03"; String contentType "referenceInformation"; String description "The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot."; String origname "solar_azimuth"; String fullnamepath "/gt1r/land_ice_segments/geophysical/solar_azimuth"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_r_eff { Float32 _FillValue 3.402823466e+38; String long_name "Effective uncorrected reflectance"; String units "1"; String source "section 3.1.5.4"; String contentType "referenceInformation"; String description "Effective reflectance, uncorrected for atmospheric effects."; String origname "r_eff"; String fullnamepath "/gt1r/land_ice_segments/geophysical/r_eff"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_dac { Float32 _FillValue 3.402823466e+38; String long_name "Dynamic Atmosphere Correction"; String units "meters"; String source "ATL03, 6.3.2"; String contentType "referenceInformation"; String description "Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect."; String origname "dac"; String fullnamepath "/gt1r/land_ice_segments/geophysical/dac"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_tide_load { Float32 _FillValue 3.402823466e+38; String long_name "Load Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.4"; String contentType "referenceInformation"; String description "Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm)."; String origname "tide_load"; String fullnamepath "/gt1r/land_ice_segments/geophysical/tide_load"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_tide_earth_free2mean { Float32 _FillValue 3.402823466e+38; String long_name "Earth Tide Free-to-Mean conversion"; String units "meters"; String source "ATL03"; String contentType "referenceInformation"; String description "Additive value to convert solid earth tide from the tide-free system to the mean tide system. (Add to tide_earth to get solid earth tides in the mean-tide system.)"; String origname "tide_earth_free2mean"; String fullnamepath "/gt1r/land_ice_segments/geophysical/tide_earth_free2mean"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_bsnow_od { Float32 _FillValue 3.402823466e+38; String long_name "Blowing snow OD"; String units "1"; String source "ATL09"; String contentType "modelResult"; String description "Optical thickness of blowing snow layer."; String origname "bsnow_od"; String fullnamepath "/gt1r/land_ice_segments/geophysical/bsnow_od"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_tide_equilibrium { Float32 _FillValue 3.402823466e+38; String long_name "Equilibrium Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.1"; String contentType "referenceInformation"; String description "Long period equilibrium tide self-consistent with the ocean tide model (+-0.04m)."; String origname "tide_equilibrium"; String fullnamepath "/gt1r/land_ice_segments/geophysical/tide_equilibrium"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_cloud_flg_atm { Int16 _FillValue 127; String long_name "Cloud Flag ATM"; String units "1"; String source "ATL09"; Int16 valid_min 0; Int16 valid_max 10; String contentType "referenceInformation"; String description "Number of layers found from the backscatter profile using the DDA layer finder."; String origname "cloud_flg_atm"; String fullnamepath "/gt1r/land_ice_segments/geophysical/cloud_flg_atm"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_solar_elevation { Float32 _FillValue 3.402823466e+38; String long_name "solar elevation"; String units "degrees"; String source "ATL03"; Float32 valid_min -90.00000000; Float32 valid_max 90.00000000; String contentType "referenceInformation"; String description "Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low-precision value, with approximately TBD degree accuracy."; String origname "solar_elevation"; String fullnamepath "/gt1r/land_ice_segments/geophysical/solar_elevation"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_tide_pole { Float32 _FillValue 3.402823466e+38; String long_name "Solid Earth Pole Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.5"; String contentType "referenceInformation"; String description "Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm)."; String origname "tide_pole"; String fullnamepath "/gt1r/land_ice_segments/geophysical/tide_pole"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_e_bckgrd { Float32 _FillValue 3.402823466e+38; String long_name "Expected background count rate"; String units "hz"; String source "section 3.6.1"; String contentType "referenceInformation"; String description "Expected background count rate based on sun angle, surface slope, for unit surface reflectance"; String origname "e_bckgrd"; String fullnamepath "/gt1r/land_ice_segments/geophysical/e_bckgrd"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_cloud_flg_asr { Int16 _FillValue 127; String long_name "Cloud Flag ASR"; String units "1"; String source "ATL09"; Int16 valid_min 0; Int16 valid_max 5; String contentType "referenceInformation"; String description "Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence"; String flag_meanings "clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence"; Int16 flag_values 0, 1, 2, 3, 4, 5; String origname "cloud_flg_asr"; String fullnamepath "/gt1r/land_ice_segments/geophysical/cloud_flg_asr"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_bckgrd { Float32 _FillValue 3.402823466e+38; String long_name "Background count rate"; String units "hz"; String source "section 3.6.1"; String contentType "referenceInformation"; String description "Background count rate, derived from the ATL03 50-shot-average, interpolated to the segment center."; String origname "bckgrd"; String fullnamepath "/gt1r/land_ice_segments/geophysical/bckgrd"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_geophysical_neutat_delay_total { Float32 _FillValue 3.402823466e+38; String long_name "Total Neutral Atmospheric Delay"; String units "meters"; String source "ATL03a ATBD"; String contentType "referenceInformation"; String description "Total neutral atmosphere delay correction (wet+dry)."; String origname "neutat_delay_total"; String fullnamepath "/gt1r/land_ice_segments/geophysical/neutat_delay_total"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_atl06_quality_summary { String long_name "ATL06_Quality_Summary"; String units "1"; String source "section 4.3"; Int16 valid_min 0; Int16 valid_max 1; String contentType "qualityInformation"; String description "The ATL06_quality_summary parameter indicates the best-quality subset of all ATL06 data. A zero in this parameter implies that no data-quality tests have found a problem with the segment, a one implies that some potential problem has been found. Users who select only segments with zero values for this flag can be relatively certain of obtaining high-quality data, but will likely miss a significant fraction of usable data, particularly in cloudy, rough, or low-surface-reflectance conditions."; String flag_meanings "best_quality potential_problem"; Int16 flag_values 0, 1; String origname "atl06_quality_summary"; String fullnamepath "/gt1r/land_ice_segments/atl06_quality_summary"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_segment_id { Int32 _FillValue 0; String long_name "Reference Point, m"; String units "1"; String source "section 3.1.2.1"; String contentType "referenceInformation"; String description "Segment number, counting from the equator. Equal to the segment_id for the second of the two 20m ATL03 segments included in the 40m ATL06 segment"; String origname "segment_id"; String fullnamepath "/gt1r/land_ice_segments/segment_id"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_bias_correction_fpb_mean_corr { Float32 _FillValue 3.402823466e+38; String long_name "first photon bias mean correction"; String units "meters"; String source "section 3.4.3.1"; String contentType "qualityInformation"; String description "Estimated first-photon bias (fpb) correction to mean segment height"; String origname "fpb_mean_corr"; String fullnamepath "/gt1r/land_ice_segments/bias_correction/fpb_mean_corr"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_bias_correction_fpb_mean_corr_sigma { String units "meters"; Float32 _FillValue 3.402823466e+38; String long_name "fpb mean corr sigma"; String source "section 3.4.3.1"; String contentType "qualityInformation"; String description "Estimated error in fpb_mean_corr"; String origname "fpb_mean_corr_sigma"; String fullnamepath "/gt1r/land_ice_segments/bias_correction/fpb_mean_corr_sigma"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_bias_correction_fpb_med_corr { Float32 _FillValue 3.402823466e+38; String long_name "fpb median corr"; String units "meters"; String source "section 3.4.3.2"; String contentType "qualityInformation"; String description "First-photon-bias correction giving the difference between the mean segment height and the corrected median height"; String origname "fpb_med_corr"; String fullnamepath "/gt1r/land_ice_segments/bias_correction/fpb_med_corr"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_bias_correction_fpb_med_corr_sigma { Float32 _FillValue 3.402823466e+38; String long_name "fpb median corr sigma"; String units "meters"; String source "section 3.4.3.2"; String contentType "qualityInformation"; String description "Estimated error in fpb_med_corr"; String origname "fpb_med_corr_sigma"; String fullnamepath "/gt1r/land_ice_segments/bias_correction/fpb_med_corr_sigma"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_bias_correction_fpb_n_corr { Float32 _FillValue 3.402823466e+38; String long_name "fpb number photons corr"; String units "counts"; String source "section 4.3.3.3"; String contentType "qualityInformation"; String description "Estimated window photon count after first-photon-bias correction"; String origname "fpb_n_corr"; String fullnamepath "/gt1r/land_ice_segments/bias_correction/fpb_n_corr"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_bias_correction_tx_mean_corr { Float32 _FillValue 3.402823466e+38; String long_name "tx shape mean correction"; String units "meters"; String source "section 3.5"; String contentType "qualityInformation"; String description "Estimate of the difference between the mean of the full-waveform transmit-pulse and the mean of a broadened, truncated waveform consistent with the received pulse"; String origname "tx_mean_corr"; String fullnamepath "/gt1r/land_ice_segments/bias_correction/tx_mean_corr"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_bias_correction_med_r_fit { Float32 _FillValue 3.402823466e+38; String long_name "mean median residual"; String units "meters"; String source "section 3.3.5"; String contentType "qualityInformation"; String description "Difference between uncorrected mean and median of linear fit residuals"; String origname "med_r_fit"; String fullnamepath "/gt1r/land_ice_segments/bias_correction/med_r_fit"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_land_ice_segments_bias_correction_tx_med_corr { Float32 _FillValue 3.402823466e+38; String long_name "tx shape median correction"; String units "meters"; String source "section 3.5"; String contentType "qualityInformation"; String description "Estimate of the difference between the median of the full-waveform transmit-pulse mean and the median of a broadened, truncated waveform consistent with the received pulse"; String origname "tx_med_corr"; String fullnamepath "/gt1r/land_ice_segments/bias_correction/tx_med_corr"; String coordinates "gt1r_land_ice_segments_delta_time gt1r_land_ice_segments_latitude gt1r_land_ice_segments_longitude"; } gt1r_residual_histogram_count { Int32 _FillValue 2147483647; String long_name "Bin Counts"; String units "counts"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Residual count falling with each histogram bin. The top height of each histogram bin may be found in the bin_top_h dataset."; String origname "count"; String fullnamepath "/gt1r/residual_histogram/count"; String coordinates "gt1r_residual_histogram_delta_time gt1r_residual_histogram_lat_mean gt1r_residual_histogram_lon_mean"; } gt1r_residual_histogram_lat_mean { String long_name "Latitude Mean"; String standard_name "latitude"; String units "degrees_north"; String source "Section 4.11"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Mean latitude of the segments included in the histogram"; String origname "lat_mean"; String fullnamepath "/gt1r/residual_histogram/lat_mean"; String coordinates "gt1r_residual_histogram_delta_time gt1r_residual_histogram_lon_mean"; } gt1r_residual_histogram_x_atc_mean { String long_name "Along Track Coordinate Mean"; String units "1"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Mean along-track coordinate of the segments included in the histogram."; String origname "x_atc_mean"; String fullnamepath "/gt1r/residual_histogram/x_atc_mean"; String coordinates "gt1r_residual_histogram_delta_time gt1r_residual_histogram_lat_mean gt1r_residual_histogram_lon_mean"; } gt1r_residual_histogram_segment_id_list { String long_name "Segment ID List"; String units "1"; String source "Section 4.11"; String contentType "referenceInformation"; String description "Segments ids included in each column of the histogram"; Int32 _FillValue 2147483647; String origname "segment_id_list"; String fullnamepath "/gt1r/residual_histogram/segment_id_list"; String coordinates "gt1r_residual_histogram_delta_time gt1r_residual_histogram_lat_mean gt1r_residual_histogram_lon_mean"; } gt1r_residual_histogram_bckgrd_per_m { String long_name "Expected background PEs"; String units "1"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Number of background PE expected for each vertical meter of the histogram based on the observed background rate (bckgrd)."; String origname "bckgrd_per_m"; String fullnamepath "/gt1r/residual_histogram/bckgrd_per_m"; String coordinates "gt1r_residual_histogram_delta_time gt1r_residual_histogram_lat_mean gt1r_residual_histogram_lon_mean"; } gt1r_residual_histogram_pulse_count { String long_name "Number of Histogram Segment Pulses"; String units "counts"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Number of pulses potentially included in the histogram (pulses are counted if they are in the central 20 m of each segment, even if no PE from the pulse are selected)."; String origname "pulse_count"; String fullnamepath "/gt1r/residual_histogram/pulse_count"; String coordinates "gt1r_residual_histogram_delta_time gt1r_residual_histogram_lat_mean gt1r_residual_histogram_lon_mean"; } gt1r_residual_histogram_lon_mean { String long_name "Longitude Mean"; String standard_name "longitude"; String units "degrees_east"; String source "Section 4.11"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Mean longitude of the segments included in the histogram"; String origname "lon_mean"; String fullnamepath "/gt1r/residual_histogram/lon_mean"; String coordinates "gt1r_residual_histogram_delta_time gt1r_residual_histogram_lat_mean"; } gt1r_segment_quality_record_number { String long_name "Land Ice Height Index"; String units "1"; String source "section 4.2"; String contentType "referenceInformation"; String description "For those segments that have adequate signal strength, this parameter gives the record for the pair within the other groups in the granule."; String origname "record_number"; String fullnamepath "/gt1r/segment_quality/record_number"; String coordinates "gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lat gt1r_segment_quality_reference_pt_lon"; } gt1r_segment_quality_reference_pt_lat { String long_name "Latitude"; String units "degrees_north"; String source "section 3.1.9"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "referenceInformation"; String description "Latitude of the reference segment location on the RPT"; String standard_name "latitude"; String origname "reference_pt_lat"; String fullnamepath "/gt1r/segment_quality/reference_pt_lat"; String coordinates "gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lon"; } gt1r_segment_quality_reference_pt_lon { String long_name "Longitude"; String units "degrees_east"; String source "section 3.1.9"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "referenceInformation"; String description "Longitude of the reference segment location on the RPT"; String standard_name "longitude"; String origname "reference_pt_lon"; String fullnamepath "/gt1r/segment_quality/reference_pt_lon"; String coordinates "gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lat"; } gt1r_segment_quality_segment_id { String long_name "Reference Point, m"; String units "1"; String source "section 3.1.2.1"; String contentType "referenceInformation"; String description "Segment number corresponding to the second of two ATL03 segments in the ATL06 segment, counted from the RGT equator crossing"; String origname "segment_id"; String fullnamepath "/gt1r/segment_quality/segment_id"; String coordinates "gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lat gt1r_segment_quality_reference_pt_lon"; } gt1r_segment_quality_signal_selection_source { String long_name "Signal Selection Source"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 2=Signal selection failed using all flagged ATL03 PE, but succeeded using the backup algorithm; 3=All signal-finding strategies failed."; String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_source"; String fullnamepath "/gt1r/segment_quality/signal_selection_source"; String coordinates "gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lat gt1r_segment_quality_reference_pt_lon"; } gt1r_segment_quality_signal_selection_status_signal_selection_status_all { String units "1"; String long_name "Signal Selection Status Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using all ATL03-flagged PEs. 0=Signal selection succeeded using all ATL03-flagged PEs (or algorithm not attempted); 1=Signal selection using all ATL03-flagged PEs failed the 20-meter-spread test; 2=Signal selection using all ATL03-flagged PEs failed the 10-photon-count test; 3=Signal selection using all ATL03-flagged PEs failed both tests"; String flag_meanings "succeeded failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_status_all"; String fullnamepath "/gt1r/segment_quality/signal_selection_status/signal_selection_status_all"; String coordinates "gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lat gt1r_segment_quality_reference_pt_lon"; } gt1r_segment_quality_signal_selection_status_signal_selection_status_backup { String units "1"; String long_name "Signal Selection Backup Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 4; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using the backup signal finder. 0=Signal selection succeeded using the backup signal finder after centering the window on flagged PE (or backup signal finder not attempted); 1=Signal selection succeeded using the backup signal finder after searching for the strongest-signal window using four adjacent ATL03 segments; 2=Signal selection using the backup signal finder failed the 20-meter spread test; 3=Signal selection using the backup signal finder failed the 10-photon count test; 4=Signal selection using the backup signal finder failed both tests"; String flag_meanings "succeeded failed_widen failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3, 4; String origname "signal_selection_status_backup"; String fullnamepath "/gt1r/segment_quality/signal_selection_status/signal_selection_status_backup"; String coordinates "gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lat gt1r_segment_quality_reference_pt_lon"; } gt1r_segment_quality_signal_selection_status_signal_selection_status_confident { String units "1"; String long_name "Signal Selection Confident Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using low or better PEs. 0=Signal selection succeeded using ATL03 low-or-better confidence PEs; 1=Signal selection using ATL03 low-or-better confidence PEs failed the 20-meter-spread test; 2=Signal selection using ATL03 low-or-better confidence PEs failed the 10-photon-count test; 3=Signal selection using ATL03 low-or-better confidence PEs failed both tests"; String flag_meanings "succeeded failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_status_confident"; String fullnamepath "/gt1r/segment_quality/signal_selection_status/signal_selection_status_confident"; String coordinates "gt1r_segment_quality_delta_time gt1r_segment_quality_reference_pt_lat gt1r_segment_quality_reference_pt_lon"; } gt2r_land_ice_segments_sigma_geo_h { Float32 _FillValue 3.402823466e+38; String long_name "Vertical Geolocation Error"; String units "meters"; String source "ATBD Section 3.10"; String contentType "qualityInformation"; String description "Total vertical geolocation error due to PPD and POD, including the effects of horizontal geolocation error on the segment vertical error."; String origname "sigma_geo_h"; String fullnamepath "/gt2r/land_ice_segments/sigma_geo_h"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_h_li_sigma { Float32 _FillValue 3.402823466e+38; String long_name "Expected RMS segment misfit"; String units "meters"; String source "section 4.4"; String contentType "qualityInformation"; String description "Propagated error due to sampling error and FPB correction from the land ice algorithm"; String origname "h_li_sigma"; String fullnamepath "/gt2r/land_ice_segments/h_li_sigma"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_h_mean { Float32 _FillValue 3.402823466e+38; String long_name "Height Mean"; String units "meters"; String source "ATL06 ATBD"; String contentType "modelResult"; String description "Mean surface height, not corrected for first-photon bias or pulse truncation."; String origname "h_mean"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/h_mean"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_signal_selection_source { String long_name "Signal Selection Source"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 2=Signal selection failed using all flagged ATL03 PE, but succeeded using the backup algorithm; 3=All signal-finding strategies failed."; String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_source"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/signal_selection_source"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_snr { Float32 _FillValue 3.402823466e+38; String long_name "SNR"; String units "1"; String source "section 3.6.2"; String contentType "physicalMeasurement"; String description "Signal-to-noise ratio in the final refined window"; String origname "snr"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/snr"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_h_robust_sprd { Float32 _FillValue 3.402823466e+38; String long_name "Robust Spread"; String units "meters"; String source "section 3.6.3"; String contentType "referenceInformation"; String description "RDE of misfit between PE heights and the along-track segment fit."; String origname "h_robust_sprd"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/h_robust_sprd"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_n_seg_pulses { String units "counts"; Float32 _FillValue 3.402823466e+38; String long_name "Number potential segment pulses"; String source "section 3.3.3"; String contentType "referenceInformation"; String description "The number of pulses potentially included in the segment"; String origname "n_seg_pulses"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/n_seg_pulses"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_dh_fit_dx_sigma { Float32 _FillValue 3.402823466e+38; String long_name "Sigma of Along Track Slope"; String units "meters/meters"; String source "section 3.6.4"; String contentType "qualityInformation"; String description "Propagated error in the along-track segment slope"; String origname "dh_fit_dx_sigma"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/dh_fit_dx_sigma"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_snr_significance { Float32 _FillValue 3.402823466e+38; String long_name "SNR Significance"; String units "1"; String source "section 3.6.2"; String contentType "physicalMeasurement"; String description "Probability that signal-finding routine would converge to at least the observed SNR for a random-noise input. Small values indicate a small likelihood of a surface-detection blunder."; String origname "snr_significance"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/snr_significance"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_h_expected_rms { Float32 _FillValue 3.402823466e+38; String long_name "Expected RMS misfit"; String units "meters"; String source "section 3.6.3"; String contentType "qualityInformation"; String description "Expected RMS misfit between PE heights and along-track segment fit"; String origname "h_expected_rms"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/h_expected_rms"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_dh_fit_dy { Float32 _FillValue 3.402823466e+38; String long_name "Across Track Slope"; String units "meters/meters"; String source "section 3.7"; String contentType "physicalMeasurement"; String description "Across track slope from segment fits to weak and strong beam; the same slope is reported for both laser beams in each pair"; String origname "dh_fit_dy"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/dh_fit_dy"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_sigma_h_mean { Float32 _FillValue 3.402823466e+38; String long_name "Height Error"; String units "meters"; String source "section 3.6.4"; String contentType "qualityInformation"; String description "Propagated height error due to PE-height sampling error for height from the along-track fit, not including geolocation-induced error"; String origname "sigma_h_mean"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/sigma_h_mean"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_h_rms_misfit { Float32 _FillValue 3.402823466e+38; String long_name "RMS Misfit"; String units "meters"; String source "section 3.6.3"; String contentType "qualityInformation"; String description "RMS misfit between PE heights and along- track segment fit"; String origname "h_rms_misfit"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/h_rms_misfit"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_signal_selection_source_status { String long_name "Signal Selection Source Status"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 4; String contentType "qualityInformation"; String description "Indicates the status of the last signal selection algorithm attempted (see signal_selection_source). The definition of flag is different for each source and are defined in each of the signal_selection_status flags. (See Land Ice ATBD Table 3-2)."; String origname "signal_selection_source_status"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/signal_selection_source_status"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_dh_fit_dx { Float32 _FillValue 3.402823466e+38; String long_name "Along Track Slope"; String units "meters/meters"; String source "section 3.3.5.1"; String contentType "physicalMeasurement"; String description "Along-track slope from along-track segment fit"; String origname "dh_fit_dx"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/dh_fit_dx"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_n_fit_photons { Int32 _FillValue 2147483647; String long_name "Number of Photons in Fit"; String units "1"; String source "section 3.3.5.2"; String contentType "physicalMeasurement"; String description "Number of PEs used in determining h_li, after editing"; String origname "n_fit_photons"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/n_fit_photons"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_fit_statistics_w_surface_window_final { Float32 _FillValue 3.402823466e+38; String long_name "Surface Window Width"; String units "meters"; String source "section 3.3.5.2"; String contentType "physicalMeasurement"; String description "Width of the surface window, top to bottom"; String origname "w_surface_window_final"; String fullnamepath "/gt2r/land_ice_segments/fit_statistics/w_surface_window_final"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_longitude { String long_name "Longitude"; String standard_name "longitude"; String units "degrees_east"; String source "section 3.10"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Longitude of segment center, , WGS84, East=+"; String origname "longitude"; String fullnamepath "/gt2r/land_ice_segments/longitude"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude"; } gt2r_land_ice_segments_latitude { String long_name "Latitude"; String standard_name "latitude"; String units "degrees_north"; String source "section 3.10"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Latitude of segment center, WGS84, North=+,"; String origname "latitude"; String fullnamepath "/gt2r/land_ice_segments/latitude"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_h_li { Float32 _FillValue 3.402823466e+38; String long_name "Land Ice height"; String units "meters"; String source "section 4.4"; String contentType "physicalMeasurement"; String description "Standard land-ice segment height determined by land ice algorithm, corrected for first-photon bias, representing the median- based height of the selected PEs"; String origname "h_li"; String fullnamepath "/gt2r/land_ice_segments/h_li"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_ground_track_ref_azimuth { String units "radians"; Float32 _FillValue 3.402823466e+38; String long_name "Azimuth"; String source "ATL03g, Section 3.3"; String contentType "referenceInformation"; String description "The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft)."; String origname "ref_azimuth"; String fullnamepath "/gt2r/land_ice_segments/ground_track/ref_azimuth"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_ground_track_seg_azimuth { Float32 _FillValue 3.402823466e+38; String long_name "Segment Azimuth"; String units "degrees"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "Azimuth of the pair-track, east of local north."; String origname "seg_azimuth"; String fullnamepath "/gt2r/land_ice_segments/ground_track/seg_azimuth"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_ground_track_sigma_geo_at { Float32 _FillValue 3.402823466e+38; String long_name "Along Track Geolocation Error"; String units "meters"; String source "section 3.10"; String contentType "qualityInformation"; String description "Along-track component of the geolocation error."; String origname "sigma_geo_at"; String fullnamepath "/gt2r/land_ice_segments/ground_track/sigma_geo_at"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_ground_track_sigma_geo_r { Float32 _FillValue 3.402823466e+38; String long_name "Radial Orbit Error"; String units "meters"; String source "ATBD Section 3.10, (ATL03 sigma_h)"; String contentType "qualityInformation"; String description "Radial orbit component of the geolocation error."; String origname "sigma_geo_r"; String fullnamepath "/gt2r/land_ice_segments/ground_track/sigma_geo_r"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_ground_track_ref_coelv { Float32 _FillValue 3.402823466e+38; String long_name "Co-elevation"; String units "radians"; String source "ATL03g, Section 3.3"; String contentType "referenceInformation"; String description "Coelevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot."; String origname "ref_coelv"; String fullnamepath "/gt2r/land_ice_segments/ground_track/ref_coelv"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_ground_track_sigma_geo_xt { Float32 _FillValue 3.402823466e+38; String long_name "Across Track Geolocation Error"; String units "meters"; String source "section 3.10"; String contentType "qualityInformation"; String description "Across-track component of the geolocation error."; String origname "sigma_geo_xt"; String fullnamepath "/gt2r/land_ice_segments/ground_track/sigma_geo_xt"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_ground_track_x_atc { Float64 _FillValue 1.7976931348623157e+308; String long_name "X Along Track"; String units "meters"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "The along-track x-coordinate of the segment, measured parallel to the RGT, measured from the ascending node of the equatorial crossing of a given RGT."; String origname "x_atc"; String fullnamepath "/gt2r/land_ice_segments/ground_track/x_atc"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_ground_track_y_atc { Float32 _FillValue 3.402823466e+38; String long_name "Y Along Track"; String units "meters"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "Along-track y coordinate of the segment, relative to the RGT, measured along the perpendicular to the RGT, positive to the right of the RGT."; String origname "y_atc"; String fullnamepath "/gt2r/land_ice_segments/ground_track/y_atc"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_dem_dem_flag { String long_name "DEM Source Flag"; String units "1"; String source "ATL03"; Int16 valid_min 0; Int16 valid_max 4; String contentType "referenceInformation"; String description "Indicates source of the DEM height. Values: 0=None, 1=Arctic, 2=Global, 3=MSS, 4=Antarctic."; String flag_meanings "none arctic global mss antarctic"; Int16 flag_values 0, 1, 2, 3, 4; String origname "dem_flag"; String fullnamepath "/gt2r/land_ice_segments/dem/dem_flag"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_dem_geoid_free2mean { Float32 _FillValue 3.402823466e+38; String long_name "Geoid Free-to-Mean conversion"; String units "meters"; String source "ATL03"; String contentType "modelResult"; String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system. (Add to geoid to get the geoid heights in the mean-tide system.)"; String origname "geoid_free2mean"; String fullnamepath "/gt2r/land_ice_segments/dem/geoid_free2mean"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_dem_dem_h { Float32 _FillValue 3.402823466e+38; String long_name "DEM Height"; String units "meters"; String source "ATL06 ATBD"; String contentType "referenceInformation"; String description "Height of the DEM, interpolated by cubic-spline interpolation in the DEM coordinate system to the PE location. (Best available DEM value in priority of Arctic/Antarctic/Global/MSS)"; String origname "dem_h"; String fullnamepath "/gt2r/land_ice_segments/dem/dem_h"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_dem_geoid_h { Float32 _FillValue 3.402823466e+38; String long_name "Geoid Height"; String units "meters"; String source "EGM2008"; String contentType "referenceInformation"; String description "Geoid height above WGS-84 reference ellipsoid (range -107 to 86m) in the tide-free system."; String origname "geoid_h"; String fullnamepath "/gt2r/land_ice_segments/dem/geoid_h"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_msw_flag { Int16 _FillValue 127; String long_name "Multiple Scattering Warning Flag"; String units "1"; String source "ATL09"; Int16 valid_min -1; Int16 valid_max 5; String contentType "referenceInformation"; String description "Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight."; String flag_meanings "cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5"; Int16 flag_values -1, 0, 1, 2, 3, 4, 5; String origname "msw_flag"; String fullnamepath "/gt2r/land_ice_segments/geophysical/msw_flag"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_layer_flag { String units "1"; String source "ATL09"; Int16 _FillValue 127; String long_name "Consolidated cloud flag"; Int16 valid_min 0; Int16 valid_max 1; String contentType "referenceInformation"; String description "This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow."; String flag_meanings "likely_clear likely_cloudy"; Int16 flag_values 0, 1; String origname "layer_flag"; String fullnamepath "/gt2r/land_ice_segments/geophysical/layer_flag"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_bsnow_conf { Int16 _FillValue 127; String long_name "Blowing Snow confidence"; String units "1"; String source "ATL09"; String contentType "referenceInformation"; String description "Confidence flag for presence of blowing snow"; String origname "bsnow_conf"; String fullnamepath "/gt2r/land_ice_segments/geophysical/bsnow_conf"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_bsnow_h { Float32 _FillValue 3.402823466e+38; String long_name "Blowing Snow Layer Top Height"; String units "meters"; String source "ATL09"; String contentType "referenceInformation"; String description "Blowing snow layer top height"; String origname "bsnow_h"; String fullnamepath "/gt2r/land_ice_segments/geophysical/bsnow_h"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_tide_ocean { Float32 _FillValue 3.402823466e+38; String long_name "Ocean Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.1"; String contentType "referenceInformation"; String description "Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium)."; String origname "tide_ocean"; String fullnamepath "/gt2r/land_ice_segments/geophysical/tide_ocean"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_tide_earth { Float32 _FillValue 3.402823466e+38; String long_name "Earth Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.3"; String contentType "referenceInformation"; String description "Solid earth tides in the tide-free system."; String origname "tide_earth"; String fullnamepath "/gt2r/land_ice_segments/geophysical/tide_earth"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_solar_azimuth { Float32 _FillValue 3.402823466e+38; String long_name "solar azimuth"; String units "degrees_east"; String source "ATL03"; String contentType "referenceInformation"; String description "The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot."; String origname "solar_azimuth"; String fullnamepath "/gt2r/land_ice_segments/geophysical/solar_azimuth"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_r_eff { Float32 _FillValue 3.402823466e+38; String long_name "Effective uncorrected reflectance"; String units "1"; String source "section 3.1.5.4"; String contentType "referenceInformation"; String description "Effective reflectance, uncorrected for atmospheric effects."; String origname "r_eff"; String fullnamepath "/gt2r/land_ice_segments/geophysical/r_eff"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_dac { Float32 _FillValue 3.402823466e+38; String long_name "Dynamic Atmosphere Correction"; String units "meters"; String source "ATL03, 6.3.2"; String contentType "referenceInformation"; String description "Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect."; String origname "dac"; String fullnamepath "/gt2r/land_ice_segments/geophysical/dac"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_tide_load { Float32 _FillValue 3.402823466e+38; String long_name "Load Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.4"; String contentType "referenceInformation"; String description "Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm)."; String origname "tide_load"; String fullnamepath "/gt2r/land_ice_segments/geophysical/tide_load"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_tide_earth_free2mean { Float32 _FillValue 3.402823466e+38; String long_name "Earth Tide Free-to-Mean conversion"; String units "meters"; String source "ATL03"; String contentType "referenceInformation"; String description "Additive value to convert solid earth tide from the tide-free system to the mean tide system. (Add to tide_earth to get solid earth tides in the mean-tide system.)"; String origname "tide_earth_free2mean"; String fullnamepath "/gt2r/land_ice_segments/geophysical/tide_earth_free2mean"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_bsnow_od { Float32 _FillValue 3.402823466e+38; String long_name "Blowing snow OD"; String units "1"; String source "ATL09"; String contentType "modelResult"; String description "Optical thickness of blowing snow layer."; String origname "bsnow_od"; String fullnamepath "/gt2r/land_ice_segments/geophysical/bsnow_od"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_tide_equilibrium { Float32 _FillValue 3.402823466e+38; String long_name "Equilibrium Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.1"; String contentType "referenceInformation"; String description "Long period equilibrium tide self-consistent with the ocean tide model (+-0.04m)."; String origname "tide_equilibrium"; String fullnamepath "/gt2r/land_ice_segments/geophysical/tide_equilibrium"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_cloud_flg_atm { Int16 _FillValue 127; String long_name "Cloud Flag ATM"; String units "1"; String source "ATL09"; Int16 valid_min 0; Int16 valid_max 10; String contentType "referenceInformation"; String description "Number of layers found from the backscatter profile using the DDA layer finder."; String origname "cloud_flg_atm"; String fullnamepath "/gt2r/land_ice_segments/geophysical/cloud_flg_atm"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_solar_elevation { Float32 _FillValue 3.402823466e+38; String long_name "solar elevation"; String units "degrees"; String source "ATL03"; Float32 valid_min -90.00000000; Float32 valid_max 90.00000000; String contentType "referenceInformation"; String description "Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low-precision value, with approximately TBD degree accuracy."; String origname "solar_elevation"; String fullnamepath "/gt2r/land_ice_segments/geophysical/solar_elevation"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_tide_pole { Float32 _FillValue 3.402823466e+38; String long_name "Solid Earth Pole Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.5"; String contentType "referenceInformation"; String description "Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm)."; String origname "tide_pole"; String fullnamepath "/gt2r/land_ice_segments/geophysical/tide_pole"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_e_bckgrd { Float32 _FillValue 3.402823466e+38; String long_name "Expected background count rate"; String units "hz"; String source "section 3.6.1"; String contentType "referenceInformation"; String description "Expected background count rate based on sun angle, surface slope, for unit surface reflectance"; String origname "e_bckgrd"; String fullnamepath "/gt2r/land_ice_segments/geophysical/e_bckgrd"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_cloud_flg_asr { Int16 _FillValue 127; String long_name "Cloud Flag ASR"; String units "1"; String source "ATL09"; Int16 valid_min 0; Int16 valid_max 5; String contentType "referenceInformation"; String description "Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence"; String flag_meanings "clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence"; Int16 flag_values 0, 1, 2, 3, 4, 5; String origname "cloud_flg_asr"; String fullnamepath "/gt2r/land_ice_segments/geophysical/cloud_flg_asr"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_bckgrd { Float32 _FillValue 3.402823466e+38; String long_name "Background count rate"; String units "hz"; String source "section 3.6.1"; String contentType "referenceInformation"; String description "Background count rate, derived from the ATL03 50-shot-average, interpolated to the segment center."; String origname "bckgrd"; String fullnamepath "/gt2r/land_ice_segments/geophysical/bckgrd"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_geophysical_neutat_delay_total { Float32 _FillValue 3.402823466e+38; String long_name "Total Neutral Atmospheric Delay"; String units "meters"; String source "ATL03a ATBD"; String contentType "referenceInformation"; String description "Total neutral atmosphere delay correction (wet+dry)."; String origname "neutat_delay_total"; String fullnamepath "/gt2r/land_ice_segments/geophysical/neutat_delay_total"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_atl06_quality_summary { String long_name "ATL06_Quality_Summary"; String units "1"; String source "section 4.3"; Int16 valid_min 0; Int16 valid_max 1; String contentType "qualityInformation"; String description "The ATL06_quality_summary parameter indicates the best-quality subset of all ATL06 data. A zero in this parameter implies that no data-quality tests have found a problem with the segment, a one implies that some potential problem has been found. Users who select only segments with zero values for this flag can be relatively certain of obtaining high-quality data, but will likely miss a significant fraction of usable data, particularly in cloudy, rough, or low-surface-reflectance conditions."; String flag_meanings "best_quality potential_problem"; Int16 flag_values 0, 1; String origname "atl06_quality_summary"; String fullnamepath "/gt2r/land_ice_segments/atl06_quality_summary"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_segment_id { Int32 _FillValue 0; String long_name "Reference Point, m"; String units "1"; String source "section 3.1.2.1"; String contentType "referenceInformation"; String description "Segment number, counting from the equator. Equal to the segment_id for the second of the two 20m ATL03 segments included in the 40m ATL06 segment"; String origname "segment_id"; String fullnamepath "/gt2r/land_ice_segments/segment_id"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_bias_correction_fpb_mean_corr { Float32 _FillValue 3.402823466e+38; String long_name "first photon bias mean correction"; String units "meters"; String source "section 3.4.3.1"; String contentType "qualityInformation"; String description "Estimated first-photon bias (fpb) correction to mean segment height"; String origname "fpb_mean_corr"; String fullnamepath "/gt2r/land_ice_segments/bias_correction/fpb_mean_corr"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_bias_correction_fpb_mean_corr_sigma { String units "meters"; Float32 _FillValue 3.402823466e+38; String long_name "fpb mean corr sigma"; String source "section 3.4.3.1"; String contentType "qualityInformation"; String description "Estimated error in fpb_mean_corr"; String origname "fpb_mean_corr_sigma"; String fullnamepath "/gt2r/land_ice_segments/bias_correction/fpb_mean_corr_sigma"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_bias_correction_fpb_med_corr { Float32 _FillValue 3.402823466e+38; String long_name "fpb median corr"; String units "meters"; String source "section 3.4.3.2"; String contentType "qualityInformation"; String description "First-photon-bias correction giving the difference between the mean segment height and the corrected median height"; String origname "fpb_med_corr"; String fullnamepath "/gt2r/land_ice_segments/bias_correction/fpb_med_corr"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_bias_correction_fpb_med_corr_sigma { Float32 _FillValue 3.402823466e+38; String long_name "fpb median corr sigma"; String units "meters"; String source "section 3.4.3.2"; String contentType "qualityInformation"; String description "Estimated error in fpb_med_corr"; String origname "fpb_med_corr_sigma"; String fullnamepath "/gt2r/land_ice_segments/bias_correction/fpb_med_corr_sigma"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_bias_correction_fpb_n_corr { Float32 _FillValue 3.402823466e+38; String long_name "fpb number photons corr"; String units "counts"; String source "section 4.3.3.3"; String contentType "qualityInformation"; String description "Estimated window photon count after first-photon-bias correction"; String origname "fpb_n_corr"; String fullnamepath "/gt2r/land_ice_segments/bias_correction/fpb_n_corr"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_bias_correction_tx_mean_corr { Float32 _FillValue 3.402823466e+38; String long_name "tx shape mean correction"; String units "meters"; String source "section 3.5"; String contentType "qualityInformation"; String description "Estimate of the difference between the mean of the full-waveform transmit-pulse and the mean of a broadened, truncated waveform consistent with the received pulse"; String origname "tx_mean_corr"; String fullnamepath "/gt2r/land_ice_segments/bias_correction/tx_mean_corr"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_bias_correction_med_r_fit { Float32 _FillValue 3.402823466e+38; String long_name "mean median residual"; String units "meters"; String source "section 3.3.5"; String contentType "qualityInformation"; String description "Difference between uncorrected mean and median of linear fit residuals"; String origname "med_r_fit"; String fullnamepath "/gt2r/land_ice_segments/bias_correction/med_r_fit"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_land_ice_segments_bias_correction_tx_med_corr { Float32 _FillValue 3.402823466e+38; String long_name "tx shape median correction"; String units "meters"; String source "section 3.5"; String contentType "qualityInformation"; String description "Estimate of the difference between the median of the full-waveform transmit-pulse mean and the median of a broadened, truncated waveform consistent with the received pulse"; String origname "tx_med_corr"; String fullnamepath "/gt2r/land_ice_segments/bias_correction/tx_med_corr"; String coordinates "gt2r_land_ice_segments_delta_time gt2r_land_ice_segments_latitude gt2r_land_ice_segments_longitude"; } gt2r_residual_histogram_count { Int32 _FillValue 2147483647; String long_name "Bin Counts"; String units "counts"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Residual count falling with each histogram bin. The top height of each histogram bin may be found in the bin_top_h dataset."; String origname "count"; String fullnamepath "/gt2r/residual_histogram/count"; String coordinates "gt2r_residual_histogram_delta_time gt2r_residual_histogram_lat_mean gt2r_residual_histogram_lon_mean"; } gt2r_residual_histogram_lat_mean { String long_name "Latitude Mean"; String standard_name "latitude"; String units "degrees_north"; String source "Section 4.11"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Mean latitude of the segments included in the histogram"; String origname "lat_mean"; String fullnamepath "/gt2r/residual_histogram/lat_mean"; String coordinates "gt2r_residual_histogram_delta_time gt2r_residual_histogram_lon_mean"; } gt2r_residual_histogram_x_atc_mean { String long_name "Along Track Coordinate Mean"; String units "1"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Mean along-track coordinate of the segments included in the histogram."; String origname "x_atc_mean"; String fullnamepath "/gt2r/residual_histogram/x_atc_mean"; String coordinates "gt2r_residual_histogram_delta_time gt2r_residual_histogram_lat_mean gt2r_residual_histogram_lon_mean"; } gt2r_residual_histogram_segment_id_list { String long_name "Segment ID List"; String units "1"; String source "Section 4.11"; String contentType "referenceInformation"; String description "Segments ids included in each column of the histogram"; Int32 _FillValue 2147483647; String origname "segment_id_list"; String fullnamepath "/gt2r/residual_histogram/segment_id_list"; String coordinates "gt2r_residual_histogram_delta_time gt2r_residual_histogram_lat_mean gt2r_residual_histogram_lon_mean"; } gt2r_residual_histogram_bckgrd_per_m { String long_name "Expected background PEs"; String units "1"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Number of background PE expected for each vertical meter of the histogram based on the observed background rate (bckgrd)."; String origname "bckgrd_per_m"; String fullnamepath "/gt2r/residual_histogram/bckgrd_per_m"; String coordinates "gt2r_residual_histogram_delta_time gt2r_residual_histogram_lat_mean gt2r_residual_histogram_lon_mean"; } gt2r_residual_histogram_pulse_count { String long_name "Number of Histogram Segment Pulses"; String units "counts"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Number of pulses potentially included in the histogram (pulses are counted if they are in the central 20 m of each segment, even if no PE from the pulse are selected)."; String origname "pulse_count"; String fullnamepath "/gt2r/residual_histogram/pulse_count"; String coordinates "gt2r_residual_histogram_delta_time gt2r_residual_histogram_lat_mean gt2r_residual_histogram_lon_mean"; } gt2r_residual_histogram_lon_mean { String long_name "Longitude Mean"; String standard_name "longitude"; String units "degrees_east"; String source "Section 4.11"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Mean longitude of the segments included in the histogram"; String origname "lon_mean"; String fullnamepath "/gt2r/residual_histogram/lon_mean"; String coordinates "gt2r_residual_histogram_delta_time gt2r_residual_histogram_lat_mean"; } gt2r_segment_quality_record_number { String long_name "Land Ice Height Index"; String units "1"; String source "section 4.2"; String contentType "referenceInformation"; String description "For those segments that have adequate signal strength, this parameter gives the record for the pair within the other groups in the granule."; String origname "record_number"; String fullnamepath "/gt2r/segment_quality/record_number"; String coordinates "gt2r_segment_quality_delta_time gt2r_segment_quality_reference_pt_lat gt2r_segment_quality_reference_pt_lon"; } gt2r_segment_quality_reference_pt_lat { String long_name "Latitude"; String units "degrees_north"; String source "section 3.1.9"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "referenceInformation"; String description "Latitude of the reference segment location on the RPT"; String standard_name "latitude"; String origname "reference_pt_lat"; String fullnamepath "/gt2r/segment_quality/reference_pt_lat"; String coordinates "gt2r_segment_quality_delta_time gt2r_segment_quality_reference_pt_lon"; } gt2r_segment_quality_reference_pt_lon { String long_name "Longitude"; String units "degrees_east"; String source "section 3.1.9"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "referenceInformation"; String description "Longitude of the reference segment location on the RPT"; String standard_name "longitude"; String origname "reference_pt_lon"; String fullnamepath "/gt2r/segment_quality/reference_pt_lon"; String coordinates "gt2r_segment_quality_delta_time gt2r_segment_quality_reference_pt_lat"; } gt2r_segment_quality_segment_id { String long_name "Reference Point, m"; String units "1"; String source "section 3.1.2.1"; String contentType "referenceInformation"; String description "Segment number corresponding to the second of two ATL03 segments in the ATL06 segment, counted from the RGT equator crossing"; String origname "segment_id"; String fullnamepath "/gt2r/segment_quality/segment_id"; String coordinates "gt2r_segment_quality_delta_time gt2r_segment_quality_reference_pt_lat gt2r_segment_quality_reference_pt_lon"; } gt2r_segment_quality_signal_selection_source { String long_name "Signal Selection Source"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 2=Signal selection failed using all flagged ATL03 PE, but succeeded using the backup algorithm; 3=All signal-finding strategies failed."; String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_source"; String fullnamepath "/gt2r/segment_quality/signal_selection_source"; String coordinates "gt2r_segment_quality_delta_time gt2r_segment_quality_reference_pt_lat gt2r_segment_quality_reference_pt_lon"; } gt2r_segment_quality_signal_selection_status_signal_selection_status_all { String units "1"; String long_name "Signal Selection Status Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using all ATL03-flagged PEs. 0=Signal selection succeeded using all ATL03-flagged PEs (or algorithm not attempted); 1=Signal selection using all ATL03-flagged PEs failed the 20-meter-spread test; 2=Signal selection using all ATL03-flagged PEs failed the 10-photon-count test; 3=Signal selection using all ATL03-flagged PEs failed both tests"; String flag_meanings "succeeded failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_status_all"; String fullnamepath "/gt2r/segment_quality/signal_selection_status/signal_selection_status_all"; String coordinates "gt2r_segment_quality_delta_time gt2r_segment_quality_reference_pt_lat gt2r_segment_quality_reference_pt_lon"; } gt2r_segment_quality_signal_selection_status_signal_selection_status_backup { String units "1"; String long_name "Signal Selection Backup Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 4; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using the backup signal finder. 0=Signal selection succeeded using the backup signal finder after centering the window on flagged PE (or backup signal finder not attempted); 1=Signal selection succeeded using the backup signal finder after searching for the strongest-signal window using four adjacent ATL03 segments; 2=Signal selection using the backup signal finder failed the 20-meter spread test; 3=Signal selection using the backup signal finder failed the 10-photon count test; 4=Signal selection using the backup signal finder failed both tests"; String flag_meanings "succeeded failed_widen failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3, 4; String origname "signal_selection_status_backup"; String fullnamepath "/gt2r/segment_quality/signal_selection_status/signal_selection_status_backup"; String coordinates "gt2r_segment_quality_delta_time gt2r_segment_quality_reference_pt_lat gt2r_segment_quality_reference_pt_lon"; } gt2r_segment_quality_signal_selection_status_signal_selection_status_confident { String units "1"; String long_name "Signal Selection Confident Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using low or better PEs. 0=Signal selection succeeded using ATL03 low-or-better confidence PEs; 1=Signal selection using ATL03 low-or-better confidence PEs failed the 20-meter-spread test; 2=Signal selection using ATL03 low-or-better confidence PEs failed the 10-photon-count test; 3=Signal selection using ATL03 low-or-better confidence PEs failed both tests"; String flag_meanings "succeeded failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_status_confident"; String fullnamepath "/gt2r/segment_quality/signal_selection_status/signal_selection_status_confident"; String coordinates "gt2r_segment_quality_delta_time gt2r_segment_quality_reference_pt_lat gt2r_segment_quality_reference_pt_lon"; } gt1l_land_ice_segments_sigma_geo_h { Float32 _FillValue 3.402823466e+38; String long_name "Vertical Geolocation Error"; String units "meters"; String source "ATBD Section 3.10"; String contentType "qualityInformation"; String description "Total vertical geolocation error due to PPD and POD, including the effects of horizontal geolocation error on the segment vertical error."; String origname "sigma_geo_h"; String fullnamepath "/gt1l/land_ice_segments/sigma_geo_h"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_h_li_sigma { Float32 _FillValue 3.402823466e+38; String long_name "Expected RMS segment misfit"; String units "meters"; String source "section 4.4"; String contentType "qualityInformation"; String description "Propagated error due to sampling error and FPB correction from the land ice algorithm"; String origname "h_li_sigma"; String fullnamepath "/gt1l/land_ice_segments/h_li_sigma"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_h_mean { Float32 _FillValue 3.402823466e+38; String long_name "Height Mean"; String units "meters"; String source "ATL06 ATBD"; String contentType "modelResult"; String description "Mean surface height, not corrected for first-photon bias or pulse truncation."; String origname "h_mean"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/h_mean"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_signal_selection_source { String long_name "Signal Selection Source"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 2=Signal selection failed using all flagged ATL03 PE, but succeeded using the backup algorithm; 3=All signal-finding strategies failed."; String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_source"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/signal_selection_source"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_snr { Float32 _FillValue 3.402823466e+38; String long_name "SNR"; String units "1"; String source "section 3.6.2"; String contentType "physicalMeasurement"; String description "Signal-to-noise ratio in the final refined window"; String origname "snr"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/snr"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_h_robust_sprd { Float32 _FillValue 3.402823466e+38; String long_name "Robust Spread"; String units "meters"; String source "section 3.6.3"; String contentType "referenceInformation"; String description "RDE of misfit between PE heights and the along-track segment fit."; String origname "h_robust_sprd"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/h_robust_sprd"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_n_seg_pulses { String units "counts"; Float32 _FillValue 3.402823466e+38; String long_name "Number potential segment pulses"; String source "section 3.3.3"; String contentType "referenceInformation"; String description "The number of pulses potentially included in the segment"; String origname "n_seg_pulses"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/n_seg_pulses"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_dh_fit_dx_sigma { Float32 _FillValue 3.402823466e+38; String long_name "Sigma of Along Track Slope"; String units "meters/meters"; String source "section 3.6.4"; String contentType "qualityInformation"; String description "Propagated error in the along-track segment slope"; String origname "dh_fit_dx_sigma"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/dh_fit_dx_sigma"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_snr_significance { Float32 _FillValue 3.402823466e+38; String long_name "SNR Significance"; String units "1"; String source "section 3.6.2"; String contentType "physicalMeasurement"; String description "Probability that signal-finding routine would converge to at least the observed SNR for a random-noise input. Small values indicate a small likelihood of a surface-detection blunder."; String origname "snr_significance"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/snr_significance"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_h_expected_rms { Float32 _FillValue 3.402823466e+38; String long_name "Expected RMS misfit"; String units "meters"; String source "section 3.6.3"; String contentType "qualityInformation"; String description "Expected RMS misfit between PE heights and along-track segment fit"; String origname "h_expected_rms"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/h_expected_rms"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_dh_fit_dy { Float32 _FillValue 3.402823466e+38; String long_name "Across Track Slope"; String units "meters/meters"; String source "section 3.7"; String contentType "physicalMeasurement"; String description "Across track slope from segment fits to weak and strong beam; the same slope is reported for both laser beams in each pair"; String origname "dh_fit_dy"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/dh_fit_dy"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_sigma_h_mean { Float32 _FillValue 3.402823466e+38; String long_name "Height Error"; String units "meters"; String source "section 3.6.4"; String contentType "qualityInformation"; String description "Propagated height error due to PE-height sampling error for height from the along-track fit, not including geolocation-induced error"; String origname "sigma_h_mean"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/sigma_h_mean"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_h_rms_misfit { Float32 _FillValue 3.402823466e+38; String long_name "RMS Misfit"; String units "meters"; String source "section 3.6.3"; String contentType "qualityInformation"; String description "RMS misfit between PE heights and along- track segment fit"; String origname "h_rms_misfit"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/h_rms_misfit"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_signal_selection_source_status { String long_name "Signal Selection Source Status"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 4; String contentType "qualityInformation"; String description "Indicates the status of the last signal selection algorithm attempted (see signal_selection_source). The definition of flag is different for each source and are defined in each of the signal_selection_status flags. (See Land Ice ATBD Table 3-2)."; String origname "signal_selection_source_status"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/signal_selection_source_status"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_dh_fit_dx { Float32 _FillValue 3.402823466e+38; String long_name "Along Track Slope"; String units "meters/meters"; String source "section 3.3.5.1"; String contentType "physicalMeasurement"; String description "Along-track slope from along-track segment fit"; String origname "dh_fit_dx"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/dh_fit_dx"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_n_fit_photons { Int32 _FillValue 2147483647; String long_name "Number of Photons in Fit"; String units "1"; String source "section 3.3.5.2"; String contentType "physicalMeasurement"; String description "Number of PEs used in determining h_li, after editing"; String origname "n_fit_photons"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/n_fit_photons"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_fit_statistics_w_surface_window_final { Float32 _FillValue 3.402823466e+38; String long_name "Surface Window Width"; String units "meters"; String source "section 3.3.5.2"; String contentType "physicalMeasurement"; String description "Width of the surface window, top to bottom"; String origname "w_surface_window_final"; String fullnamepath "/gt1l/land_ice_segments/fit_statistics/w_surface_window_final"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_longitude { String long_name "Longitude"; String standard_name "longitude"; String units "degrees_east"; String source "section 3.10"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Longitude of segment center, , WGS84, East=+"; String origname "longitude"; String fullnamepath "/gt1l/land_ice_segments/longitude"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude"; } gt1l_land_ice_segments_latitude { String long_name "Latitude"; String standard_name "latitude"; String units "degrees_north"; String source "section 3.10"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Latitude of segment center, WGS84, North=+,"; String origname "latitude"; String fullnamepath "/gt1l/land_ice_segments/latitude"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_h_li { Float32 _FillValue 3.402823466e+38; String long_name "Land Ice height"; String units "meters"; String source "section 4.4"; String contentType "physicalMeasurement"; String description "Standard land-ice segment height determined by land ice algorithm, corrected for first-photon bias, representing the median- based height of the selected PEs"; String origname "h_li"; String fullnamepath "/gt1l/land_ice_segments/h_li"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_ground_track_ref_azimuth { String units "radians"; Float32 _FillValue 3.402823466e+38; String long_name "Azimuth"; String source "ATL03g, Section 3.3"; String contentType "referenceInformation"; String description "The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft)."; String origname "ref_azimuth"; String fullnamepath "/gt1l/land_ice_segments/ground_track/ref_azimuth"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_ground_track_seg_azimuth { Float32 _FillValue 3.402823466e+38; String long_name "Segment Azimuth"; String units "degrees"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "Azimuth of the pair-track, east of local north."; String origname "seg_azimuth"; String fullnamepath "/gt1l/land_ice_segments/ground_track/seg_azimuth"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_ground_track_sigma_geo_at { Float32 _FillValue 3.402823466e+38; String long_name "Along Track Geolocation Error"; String units "meters"; String source "section 3.10"; String contentType "qualityInformation"; String description "Along-track component of the geolocation error."; String origname "sigma_geo_at"; String fullnamepath "/gt1l/land_ice_segments/ground_track/sigma_geo_at"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_ground_track_sigma_geo_r { Float32 _FillValue 3.402823466e+38; String long_name "Radial Orbit Error"; String units "meters"; String source "ATBD Section 3.10, (ATL03 sigma_h)"; String contentType "qualityInformation"; String description "Radial orbit component of the geolocation error."; String origname "sigma_geo_r"; String fullnamepath "/gt1l/land_ice_segments/ground_track/sigma_geo_r"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_ground_track_ref_coelv { Float32 _FillValue 3.402823466e+38; String long_name "Co-elevation"; String units "radians"; String source "ATL03g, Section 3.3"; String contentType "referenceInformation"; String description "Coelevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot."; String origname "ref_coelv"; String fullnamepath "/gt1l/land_ice_segments/ground_track/ref_coelv"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_ground_track_sigma_geo_xt { Float32 _FillValue 3.402823466e+38; String long_name "Across Track Geolocation Error"; String units "meters"; String source "section 3.10"; String contentType "qualityInformation"; String description "Across-track component of the geolocation error."; String origname "sigma_geo_xt"; String fullnamepath "/gt1l/land_ice_segments/ground_track/sigma_geo_xt"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_ground_track_x_atc { Float64 _FillValue 1.7976931348623157e+308; String long_name "X Along Track"; String units "meters"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "The along-track x-coordinate of the segment, measured parallel to the RGT, measured from the ascending node of the equatorial crossing of a given RGT."; String origname "x_atc"; String fullnamepath "/gt1l/land_ice_segments/ground_track/x_atc"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_ground_track_y_atc { Float32 _FillValue 3.402823466e+38; String long_name "Y Along Track"; String units "meters"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "Along-track y coordinate of the segment, relative to the RGT, measured along the perpendicular to the RGT, positive to the right of the RGT."; String origname "y_atc"; String fullnamepath "/gt1l/land_ice_segments/ground_track/y_atc"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_dem_dem_flag { String long_name "DEM Source Flag"; String units "1"; String source "ATL03"; Int16 valid_min 0; Int16 valid_max 4; String contentType "referenceInformation"; String description "Indicates source of the DEM height. Values: 0=None, 1=Arctic, 2=Global, 3=MSS, 4=Antarctic."; String flag_meanings "none arctic global mss antarctic"; Int16 flag_values 0, 1, 2, 3, 4; String origname "dem_flag"; String fullnamepath "/gt1l/land_ice_segments/dem/dem_flag"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_dem_geoid_free2mean { Float32 _FillValue 3.402823466e+38; String long_name "Geoid Free-to-Mean conversion"; String units "meters"; String source "ATL03"; String contentType "modelResult"; String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system. (Add to geoid to get the geoid heights in the mean-tide system.)"; String origname "geoid_free2mean"; String fullnamepath "/gt1l/land_ice_segments/dem/geoid_free2mean"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_dem_dem_h { Float32 _FillValue 3.402823466e+38; String long_name "DEM Height"; String units "meters"; String source "ATL06 ATBD"; String contentType "referenceInformation"; String description "Height of the DEM, interpolated by cubic-spline interpolation in the DEM coordinate system to the PE location. (Best available DEM value in priority of Arctic/Antarctic/Global/MSS)"; String origname "dem_h"; String fullnamepath "/gt1l/land_ice_segments/dem/dem_h"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_dem_geoid_h { Float32 _FillValue 3.402823466e+38; String long_name "Geoid Height"; String units "meters"; String source "EGM2008"; String contentType "referenceInformation"; String description "Geoid height above WGS-84 reference ellipsoid (range -107 to 86m) in the tide-free system."; String origname "geoid_h"; String fullnamepath "/gt1l/land_ice_segments/dem/geoid_h"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_msw_flag { Int16 _FillValue 127; String long_name "Multiple Scattering Warning Flag"; String units "1"; String source "ATL09"; Int16 valid_min -1; Int16 valid_max 5; String contentType "referenceInformation"; String description "Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight."; String flag_meanings "cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5"; Int16 flag_values -1, 0, 1, 2, 3, 4, 5; String origname "msw_flag"; String fullnamepath "/gt1l/land_ice_segments/geophysical/msw_flag"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_layer_flag { String units "1"; String source "ATL09"; Int16 _FillValue 127; String long_name "Consolidated cloud flag"; Int16 valid_min 0; Int16 valid_max 1; String contentType "referenceInformation"; String description "This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow."; String flag_meanings "likely_clear likely_cloudy"; Int16 flag_values 0, 1; String origname "layer_flag"; String fullnamepath "/gt1l/land_ice_segments/geophysical/layer_flag"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_bsnow_conf { Int16 _FillValue 127; String long_name "Blowing Snow confidence"; String units "1"; String source "ATL09"; String contentType "referenceInformation"; String description "Confidence flag for presence of blowing snow"; String origname "bsnow_conf"; String fullnamepath "/gt1l/land_ice_segments/geophysical/bsnow_conf"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_bsnow_h { Float32 _FillValue 3.402823466e+38; String long_name "Blowing Snow Layer Top Height"; String units "meters"; String source "ATL09"; String contentType "referenceInformation"; String description "Blowing snow layer top height"; String origname "bsnow_h"; String fullnamepath "/gt1l/land_ice_segments/geophysical/bsnow_h"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_tide_ocean { Float32 _FillValue 3.402823466e+38; String long_name "Ocean Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.1"; String contentType "referenceInformation"; String description "Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium)."; String origname "tide_ocean"; String fullnamepath "/gt1l/land_ice_segments/geophysical/tide_ocean"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_tide_earth { Float32 _FillValue 3.402823466e+38; String long_name "Earth Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.3"; String contentType "referenceInformation"; String description "Solid earth tides in the tide-free system."; String origname "tide_earth"; String fullnamepath "/gt1l/land_ice_segments/geophysical/tide_earth"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_solar_azimuth { Float32 _FillValue 3.402823466e+38; String long_name "solar azimuth"; String units "degrees_east"; String source "ATL03"; String contentType "referenceInformation"; String description "The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot."; String origname "solar_azimuth"; String fullnamepath "/gt1l/land_ice_segments/geophysical/solar_azimuth"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_r_eff { Float32 _FillValue 3.402823466e+38; String long_name "Effective uncorrected reflectance"; String units "1"; String source "section 3.1.5.4"; String contentType "referenceInformation"; String description "Effective reflectance, uncorrected for atmospheric effects."; String origname "r_eff"; String fullnamepath "/gt1l/land_ice_segments/geophysical/r_eff"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_dac { Float32 _FillValue 3.402823466e+38; String long_name "Dynamic Atmosphere Correction"; String units "meters"; String source "ATL03, 6.3.2"; String contentType "referenceInformation"; String description "Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect."; String origname "dac"; String fullnamepath "/gt1l/land_ice_segments/geophysical/dac"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_tide_load { Float32 _FillValue 3.402823466e+38; String long_name "Load Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.4"; String contentType "referenceInformation"; String description "Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm)."; String origname "tide_load"; String fullnamepath "/gt1l/land_ice_segments/geophysical/tide_load"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_tide_earth_free2mean { Float32 _FillValue 3.402823466e+38; String long_name "Earth Tide Free-to-Mean conversion"; String units "meters"; String source "ATL03"; String contentType "referenceInformation"; String description "Additive value to convert solid earth tide from the tide-free system to the mean tide system. (Add to tide_earth to get solid earth tides in the mean-tide system.)"; String origname "tide_earth_free2mean"; String fullnamepath "/gt1l/land_ice_segments/geophysical/tide_earth_free2mean"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_bsnow_od { Float32 _FillValue 3.402823466e+38; String long_name "Blowing snow OD"; String units "1"; String source "ATL09"; String contentType "modelResult"; String description "Optical thickness of blowing snow layer."; String origname "bsnow_od"; String fullnamepath "/gt1l/land_ice_segments/geophysical/bsnow_od"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_tide_equilibrium { Float32 _FillValue 3.402823466e+38; String long_name "Equilibrium Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.1"; String contentType "referenceInformation"; String description "Long period equilibrium tide self-consistent with the ocean tide model (+-0.04m)."; String origname "tide_equilibrium"; String fullnamepath "/gt1l/land_ice_segments/geophysical/tide_equilibrium"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_cloud_flg_atm { Int16 _FillValue 127; String long_name "Cloud Flag ATM"; String units "1"; String source "ATL09"; Int16 valid_min 0; Int16 valid_max 10; String contentType "referenceInformation"; String description "Number of layers found from the backscatter profile using the DDA layer finder."; String origname "cloud_flg_atm"; String fullnamepath "/gt1l/land_ice_segments/geophysical/cloud_flg_atm"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_solar_elevation { Float32 _FillValue 3.402823466e+38; String long_name "solar elevation"; String units "degrees"; String source "ATL03"; Float32 valid_min -90.00000000; Float32 valid_max 90.00000000; String contentType "referenceInformation"; String description "Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low-precision value, with approximately TBD degree accuracy."; String origname "solar_elevation"; String fullnamepath "/gt1l/land_ice_segments/geophysical/solar_elevation"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_tide_pole { Float32 _FillValue 3.402823466e+38; String long_name "Solid Earth Pole Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.5"; String contentType "referenceInformation"; String description "Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm)."; String origname "tide_pole"; String fullnamepath "/gt1l/land_ice_segments/geophysical/tide_pole"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_e_bckgrd { Float32 _FillValue 3.402823466e+38; String long_name "Expected background count rate"; String units "hz"; String source "section 3.6.1"; String contentType "referenceInformation"; String description "Expected background count rate based on sun angle, surface slope, for unit surface reflectance"; String origname "e_bckgrd"; String fullnamepath "/gt1l/land_ice_segments/geophysical/e_bckgrd"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_cloud_flg_asr { Int16 _FillValue 127; String long_name "Cloud Flag ASR"; String units "1"; String source "ATL09"; Int16 valid_min 0; Int16 valid_max 5; String contentType "referenceInformation"; String description "Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence"; String flag_meanings "clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence"; Int16 flag_values 0, 1, 2, 3, 4, 5; String origname "cloud_flg_asr"; String fullnamepath "/gt1l/land_ice_segments/geophysical/cloud_flg_asr"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_bckgrd { Float32 _FillValue 3.402823466e+38; String long_name "Background count rate"; String units "hz"; String source "section 3.6.1"; String contentType "referenceInformation"; String description "Background count rate, derived from the ATL03 50-shot-average, interpolated to the segment center."; String origname "bckgrd"; String fullnamepath "/gt1l/land_ice_segments/geophysical/bckgrd"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_geophysical_neutat_delay_total { Float32 _FillValue 3.402823466e+38; String long_name "Total Neutral Atmospheric Delay"; String units "meters"; String source "ATL03a ATBD"; String contentType "referenceInformation"; String description "Total neutral atmosphere delay correction (wet+dry)."; String origname "neutat_delay_total"; String fullnamepath "/gt1l/land_ice_segments/geophysical/neutat_delay_total"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_atl06_quality_summary { String long_name "ATL06_Quality_Summary"; String units "1"; String source "section 4.3"; Int16 valid_min 0; Int16 valid_max 1; String contentType "qualityInformation"; String description "The ATL06_quality_summary parameter indicates the best-quality subset of all ATL06 data. A zero in this parameter implies that no data-quality tests have found a problem with the segment, a one implies that some potential problem has been found. Users who select only segments with zero values for this flag can be relatively certain of obtaining high-quality data, but will likely miss a significant fraction of usable data, particularly in cloudy, rough, or low-surface-reflectance conditions."; String flag_meanings "best_quality potential_problem"; Int16 flag_values 0, 1; String origname "atl06_quality_summary"; String fullnamepath "/gt1l/land_ice_segments/atl06_quality_summary"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_segment_id { Int32 _FillValue 0; String long_name "Reference Point, m"; String units "1"; String source "section 3.1.2.1"; String contentType "referenceInformation"; String description "Segment number, counting from the equator. Equal to the segment_id for the second of the two 20m ATL03 segments included in the 40m ATL06 segment"; String origname "segment_id"; String fullnamepath "/gt1l/land_ice_segments/segment_id"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_bias_correction_fpb_mean_corr { Float32 _FillValue 3.402823466e+38; String long_name "first photon bias mean correction"; String units "meters"; String source "section 3.4.3.1"; String contentType "qualityInformation"; String description "Estimated first-photon bias (fpb) correction to mean segment height"; String origname "fpb_mean_corr"; String fullnamepath "/gt1l/land_ice_segments/bias_correction/fpb_mean_corr"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_bias_correction_fpb_mean_corr_sigma { String units "meters"; Float32 _FillValue 3.402823466e+38; String long_name "fpb mean corr sigma"; String source "section 3.4.3.1"; String contentType "qualityInformation"; String description "Estimated error in fpb_mean_corr"; String origname "fpb_mean_corr_sigma"; String fullnamepath "/gt1l/land_ice_segments/bias_correction/fpb_mean_corr_sigma"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_bias_correction_fpb_med_corr { Float32 _FillValue 3.402823466e+38; String long_name "fpb median corr"; String units "meters"; String source "section 3.4.3.2"; String contentType "qualityInformation"; String description "First-photon-bias correction giving the difference between the mean segment height and the corrected median height"; String origname "fpb_med_corr"; String fullnamepath "/gt1l/land_ice_segments/bias_correction/fpb_med_corr"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_bias_correction_fpb_med_corr_sigma { Float32 _FillValue 3.402823466e+38; String long_name "fpb median corr sigma"; String units "meters"; String source "section 3.4.3.2"; String contentType "qualityInformation"; String description "Estimated error in fpb_med_corr"; String origname "fpb_med_corr_sigma"; String fullnamepath "/gt1l/land_ice_segments/bias_correction/fpb_med_corr_sigma"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_bias_correction_fpb_n_corr { Float32 _FillValue 3.402823466e+38; String long_name "fpb number photons corr"; String units "counts"; String source "section 4.3.3.3"; String contentType "qualityInformation"; String description "Estimated window photon count after first-photon-bias correction"; String origname "fpb_n_corr"; String fullnamepath "/gt1l/land_ice_segments/bias_correction/fpb_n_corr"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_bias_correction_tx_mean_corr { Float32 _FillValue 3.402823466e+38; String long_name "tx shape mean correction"; String units "meters"; String source "section 3.5"; String contentType "qualityInformation"; String description "Estimate of the difference between the mean of the full-waveform transmit-pulse and the mean of a broadened, truncated waveform consistent with the received pulse"; String origname "tx_mean_corr"; String fullnamepath "/gt1l/land_ice_segments/bias_correction/tx_mean_corr"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_bias_correction_med_r_fit { Float32 _FillValue 3.402823466e+38; String long_name "mean median residual"; String units "meters"; String source "section 3.3.5"; String contentType "qualityInformation"; String description "Difference between uncorrected mean and median of linear fit residuals"; String origname "med_r_fit"; String fullnamepath "/gt1l/land_ice_segments/bias_correction/med_r_fit"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_land_ice_segments_bias_correction_tx_med_corr { Float32 _FillValue 3.402823466e+38; String long_name "tx shape median correction"; String units "meters"; String source "section 3.5"; String contentType "qualityInformation"; String description "Estimate of the difference between the median of the full-waveform transmit-pulse mean and the median of a broadened, truncated waveform consistent with the received pulse"; String origname "tx_med_corr"; String fullnamepath "/gt1l/land_ice_segments/bias_correction/tx_med_corr"; String coordinates "gt1l_land_ice_segments_delta_time gt1l_land_ice_segments_latitude gt1l_land_ice_segments_longitude"; } gt1l_residual_histogram_count { Int32 _FillValue 2147483647; String long_name "Bin Counts"; String units "counts"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Residual count falling with each histogram bin. The top height of each histogram bin may be found in the bin_top_h dataset."; String origname "count"; String fullnamepath "/gt1l/residual_histogram/count"; String coordinates "gt1l_residual_histogram_delta_time gt1l_residual_histogram_lat_mean gt1l_residual_histogram_lon_mean"; } gt1l_residual_histogram_lat_mean { String long_name "Latitude Mean"; String standard_name "latitude"; String units "degrees_north"; String source "Section 4.11"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Mean latitude of the segments included in the histogram"; String origname "lat_mean"; String fullnamepath "/gt1l/residual_histogram/lat_mean"; String coordinates "gt1l_residual_histogram_delta_time gt1l_residual_histogram_lon_mean"; } gt1l_residual_histogram_x_atc_mean { String long_name "Along Track Coordinate Mean"; String units "1"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Mean along-track coordinate of the segments included in the histogram."; String origname "x_atc_mean"; String fullnamepath "/gt1l/residual_histogram/x_atc_mean"; String coordinates "gt1l_residual_histogram_delta_time gt1l_residual_histogram_lat_mean gt1l_residual_histogram_lon_mean"; } gt1l_residual_histogram_segment_id_list { String long_name "Segment ID List"; String units "1"; String source "Section 4.11"; String contentType "referenceInformation"; String description "Segments ids included in each column of the histogram"; Int32 _FillValue 2147483647; String origname "segment_id_list"; String fullnamepath "/gt1l/residual_histogram/segment_id_list"; String coordinates "gt1l_residual_histogram_delta_time gt1l_residual_histogram_lat_mean gt1l_residual_histogram_lon_mean"; } gt1l_residual_histogram_bckgrd_per_m { String long_name "Expected background PEs"; String units "1"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Number of background PE expected for each vertical meter of the histogram based on the observed background rate (bckgrd)."; String origname "bckgrd_per_m"; String fullnamepath "/gt1l/residual_histogram/bckgrd_per_m"; String coordinates "gt1l_residual_histogram_delta_time gt1l_residual_histogram_lat_mean gt1l_residual_histogram_lon_mean"; } gt1l_residual_histogram_pulse_count { String long_name "Number of Histogram Segment Pulses"; String units "counts"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Number of pulses potentially included in the histogram (pulses are counted if they are in the central 20 m of each segment, even if no PE from the pulse are selected)."; String origname "pulse_count"; String fullnamepath "/gt1l/residual_histogram/pulse_count"; String coordinates "gt1l_residual_histogram_delta_time gt1l_residual_histogram_lat_mean gt1l_residual_histogram_lon_mean"; } gt1l_residual_histogram_lon_mean { String long_name "Longitude Mean"; String standard_name "longitude"; String units "degrees_east"; String source "Section 4.11"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Mean longitude of the segments included in the histogram"; String origname "lon_mean"; String fullnamepath "/gt1l/residual_histogram/lon_mean"; String coordinates "gt1l_residual_histogram_delta_time gt1l_residual_histogram_lat_mean"; } gt1l_segment_quality_record_number { String long_name "Land Ice Height Index"; String units "1"; String source "section 4.2"; String contentType "referenceInformation"; String description "For those segments that have adequate signal strength, this parameter gives the record for the pair within the other groups in the granule."; String origname "record_number"; String fullnamepath "/gt1l/segment_quality/record_number"; String coordinates "gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lat gt1l_segment_quality_reference_pt_lon"; } gt1l_segment_quality_reference_pt_lat { String long_name "Latitude"; String units "degrees_north"; String source "section 3.1.9"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "referenceInformation"; String description "Latitude of the reference segment location on the RPT"; String standard_name "latitude"; String origname "reference_pt_lat"; String fullnamepath "/gt1l/segment_quality/reference_pt_lat"; String coordinates "gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lon"; } gt1l_segment_quality_reference_pt_lon { String long_name "Longitude"; String units "degrees_east"; String source "section 3.1.9"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "referenceInformation"; String description "Longitude of the reference segment location on the RPT"; String standard_name "longitude"; String origname "reference_pt_lon"; String fullnamepath "/gt1l/segment_quality/reference_pt_lon"; String coordinates "gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lat"; } gt1l_segment_quality_segment_id { String long_name "Reference Point, m"; String units "1"; String source "section 3.1.2.1"; String contentType "referenceInformation"; String description "Segment number corresponding to the second of two ATL03 segments in the ATL06 segment, counted from the RGT equator crossing"; String origname "segment_id"; String fullnamepath "/gt1l/segment_quality/segment_id"; String coordinates "gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lat gt1l_segment_quality_reference_pt_lon"; } gt1l_segment_quality_signal_selection_source { String long_name "Signal Selection Source"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 2=Signal selection failed using all flagged ATL03 PE, but succeeded using the backup algorithm; 3=All signal-finding strategies failed."; String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_source"; String fullnamepath "/gt1l/segment_quality/signal_selection_source"; String coordinates "gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lat gt1l_segment_quality_reference_pt_lon"; } gt1l_segment_quality_signal_selection_status_signal_selection_status_all { String units "1"; String long_name "Signal Selection Status Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using all ATL03-flagged PEs. 0=Signal selection succeeded using all ATL03-flagged PEs (or algorithm not attempted); 1=Signal selection using all ATL03-flagged PEs failed the 20-meter-spread test; 2=Signal selection using all ATL03-flagged PEs failed the 10-photon-count test; 3=Signal selection using all ATL03-flagged PEs failed both tests"; String flag_meanings "succeeded failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_status_all"; String fullnamepath "/gt1l/segment_quality/signal_selection_status/signal_selection_status_all"; String coordinates "gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lat gt1l_segment_quality_reference_pt_lon"; } gt1l_segment_quality_signal_selection_status_signal_selection_status_backup { String units "1"; String long_name "Signal Selection Backup Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 4; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using the backup signal finder. 0=Signal selection succeeded using the backup signal finder after centering the window on flagged PE (or backup signal finder not attempted); 1=Signal selection succeeded using the backup signal finder after searching for the strongest-signal window using four adjacent ATL03 segments; 2=Signal selection using the backup signal finder failed the 20-meter spread test; 3=Signal selection using the backup signal finder failed the 10-photon count test; 4=Signal selection using the backup signal finder failed both tests"; String flag_meanings "succeeded failed_widen failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3, 4; String origname "signal_selection_status_backup"; String fullnamepath "/gt1l/segment_quality/signal_selection_status/signal_selection_status_backup"; String coordinates "gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lat gt1l_segment_quality_reference_pt_lon"; } gt1l_segment_quality_signal_selection_status_signal_selection_status_confident { String units "1"; String long_name "Signal Selection Confident Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using low or better PEs. 0=Signal selection succeeded using ATL03 low-or-better confidence PEs; 1=Signal selection using ATL03 low-or-better confidence PEs failed the 20-meter-spread test; 2=Signal selection using ATL03 low-or-better confidence PEs failed the 10-photon-count test; 3=Signal selection using ATL03 low-or-better confidence PEs failed both tests"; String flag_meanings "succeeded failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_status_confident"; String fullnamepath "/gt1l/segment_quality/signal_selection_status/signal_selection_status_confident"; String coordinates "gt1l_segment_quality_delta_time gt1l_segment_quality_reference_pt_lat gt1l_segment_quality_reference_pt_lon"; } quality_assessment_qa_granule_pass_fail { String long_name "Granule Pass Flag"; String units "1"; String source "Operations"; Int32 valid_min 0; Int32 valid_max 1; String contentType "qualityInformation"; String description "Flag indicating granule quality. 0=granule passes automatic QA. 1=granule fails automatic QA."; String flag_meanings "PASS FAIL"; Int32 flag_values 0, 1; String origname "qa_granule_pass_fail"; String fullnamepath "/quality_assessment/qa_granule_pass_fail"; } quality_assessment_gt1r_lon_mean { String long_name "Longitude Mean"; String standard_name "longitude"; String units "degrees_east"; String source "Section 4.11"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Mean longitude of the 10km segment."; String origname "lon_mean"; String fullnamepath "/quality_assessment/gt1r/lon_mean"; String coordinates "quality_assessment_gt1r_delta_time quality_assessment_gt1r_lat_mean"; } quality_assessment_gt1r_signal_selection_source_fraction_0 { String long_name "Signal Selection Source Fraction 0"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to zero."; String origname "signal_selection_source_fraction_0"; String fullnamepath "/quality_assessment/gt1r/signal_selection_source_fraction_0"; String coordinates "quality_assessment_gt1r_delta_time quality_assessment_gt1r_lat_mean quality_assessment_gt1r_lon_mean"; } quality_assessment_gt1r_signal_selection_source_fraction_1 { String long_name "Signal Selection Source Fraction 1"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 1."; String origname "signal_selection_source_fraction_1"; String fullnamepath "/quality_assessment/gt1r/signal_selection_source_fraction_1"; String coordinates "quality_assessment_gt1r_delta_time quality_assessment_gt1r_lat_mean quality_assessment_gt1r_lon_mean"; } quality_assessment_gt1r_signal_selection_source_fraction_2 { String long_name "Signal Selection Source Fraction 2"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 2."; String origname "signal_selection_source_fraction_2"; String fullnamepath "/quality_assessment/gt1r/signal_selection_source_fraction_2"; String coordinates "quality_assessment_gt1r_delta_time quality_assessment_gt1r_lat_mean quality_assessment_gt1r_lon_mean"; } quality_assessment_gt1r_lat_mean { String long_name "Latitude Mean"; String standard_name "latitude"; String units "degrees_north"; String source "Section 4.11"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Mean latitude of the 10km segment."; String origname "lat_mean"; String fullnamepath "/quality_assessment/gt1r/lat_mean"; String coordinates "quality_assessment_gt1r_delta_time quality_assessment_gt1r_lon_mean"; } quality_assessment_gt1r_signal_selection_source_fraction_3 { String long_name "Signal Selection Source Fraction 3"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 3."; String origname "signal_selection_source_fraction_3"; String fullnamepath "/quality_assessment/gt1r/signal_selection_source_fraction_3"; String coordinates "quality_assessment_gt1r_delta_time quality_assessment_gt1r_lat_mean quality_assessment_gt1r_lon_mean"; } quality_assessment_gt2r_lon_mean { String long_name "Longitude Mean"; String standard_name "longitude"; String units "degrees_east"; String source "Section 4.11"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Mean longitude of the 10km segment."; String origname "lon_mean"; String fullnamepath "/quality_assessment/gt2r/lon_mean"; String coordinates "quality_assessment_gt2r_delta_time quality_assessment_gt2r_lat_mean"; } quality_assessment_gt2r_signal_selection_source_fraction_0 { String long_name "Signal Selection Source Fraction 0"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to zero."; String origname "signal_selection_source_fraction_0"; String fullnamepath "/quality_assessment/gt2r/signal_selection_source_fraction_0"; String coordinates "quality_assessment_gt2r_delta_time quality_assessment_gt2r_lat_mean quality_assessment_gt2r_lon_mean"; } quality_assessment_gt2r_signal_selection_source_fraction_1 { String long_name "Signal Selection Source Fraction 1"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 1."; String origname "signal_selection_source_fraction_1"; String fullnamepath "/quality_assessment/gt2r/signal_selection_source_fraction_1"; String coordinates "quality_assessment_gt2r_delta_time quality_assessment_gt2r_lat_mean quality_assessment_gt2r_lon_mean"; } quality_assessment_gt2r_signal_selection_source_fraction_2 { String long_name "Signal Selection Source Fraction 2"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 2."; String origname "signal_selection_source_fraction_2"; String fullnamepath "/quality_assessment/gt2r/signal_selection_source_fraction_2"; String coordinates "quality_assessment_gt2r_delta_time quality_assessment_gt2r_lat_mean quality_assessment_gt2r_lon_mean"; } quality_assessment_gt2r_lat_mean { String long_name "Latitude Mean"; String standard_name "latitude"; String units "degrees_north"; String source "Section 4.11"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Mean latitude of the 10km segment."; String origname "lat_mean"; String fullnamepath "/quality_assessment/gt2r/lat_mean"; String coordinates "quality_assessment_gt2r_delta_time quality_assessment_gt2r_lon_mean"; } quality_assessment_gt2r_signal_selection_source_fraction_3 { String long_name "Signal Selection Source Fraction 3"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 3."; String origname "signal_selection_source_fraction_3"; String fullnamepath "/quality_assessment/gt2r/signal_selection_source_fraction_3"; String coordinates "quality_assessment_gt2r_delta_time quality_assessment_gt2r_lat_mean quality_assessment_gt2r_lon_mean"; } quality_assessment_gt1l_lon_mean { String long_name "Longitude Mean"; String standard_name "longitude"; String units "degrees_east"; String source "Section 4.11"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Mean longitude of the 10km segment."; String origname "lon_mean"; String fullnamepath "/quality_assessment/gt1l/lon_mean"; String coordinates "quality_assessment_gt1l_delta_time quality_assessment_gt1l_lat_mean"; } quality_assessment_gt1l_signal_selection_source_fraction_0 { String long_name "Signal Selection Source Fraction 0"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to zero."; String origname "signal_selection_source_fraction_0"; String fullnamepath "/quality_assessment/gt1l/signal_selection_source_fraction_0"; String coordinates "quality_assessment_gt1l_delta_time quality_assessment_gt1l_lat_mean quality_assessment_gt1l_lon_mean"; } quality_assessment_gt1l_signal_selection_source_fraction_1 { String long_name "Signal Selection Source Fraction 1"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 1."; String origname "signal_selection_source_fraction_1"; String fullnamepath "/quality_assessment/gt1l/signal_selection_source_fraction_1"; String coordinates "quality_assessment_gt1l_delta_time quality_assessment_gt1l_lat_mean quality_assessment_gt1l_lon_mean"; } quality_assessment_gt1l_signal_selection_source_fraction_2 { String long_name "Signal Selection Source Fraction 2"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 2."; String origname "signal_selection_source_fraction_2"; String fullnamepath "/quality_assessment/gt1l/signal_selection_source_fraction_2"; String coordinates "quality_assessment_gt1l_delta_time quality_assessment_gt1l_lat_mean quality_assessment_gt1l_lon_mean"; } quality_assessment_gt1l_lat_mean { String long_name "Latitude Mean"; String standard_name "latitude"; String units "degrees_north"; String source "Section 4.11"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Mean latitude of the 10km segment."; String origname "lat_mean"; String fullnamepath "/quality_assessment/gt1l/lat_mean"; String coordinates "quality_assessment_gt1l_delta_time quality_assessment_gt1l_lon_mean"; } quality_assessment_gt1l_signal_selection_source_fraction_3 { String long_name "Signal Selection Source Fraction 3"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 3."; String origname "signal_selection_source_fraction_3"; String fullnamepath "/quality_assessment/gt1l/signal_selection_source_fraction_3"; String coordinates "quality_assessment_gt1l_delta_time quality_assessment_gt1l_lat_mean quality_assessment_gt1l_lon_mean"; } quality_assessment_qa_granule_fail_reason { String long_name "Granule Failure Reason"; String units "1"; String source "Operations"; Int32 valid_min 0; Int32 valid_max 5; String contentType "qualityInformation"; String description "Flag indicating granule failure reason. 0=no failure; 1=processing error; 2=Insufficient output data was generated; 3=TBD Failure; 4=TBD_Failure; 5=other failure."; String flag_meanings "no_failure PROCESS_ERROR INSUFFICIENT_OUTPUT failure_3 failure_4 OTHER_FAILURE"; Int32 flag_values 0, 1, 2, 3, 4, 5; String origname "qa_granule_fail_reason"; String fullnamepath "/quality_assessment/qa_granule_fail_reason"; } quality_assessment_gt3l_lon_mean { String long_name "Longitude Mean"; String standard_name "longitude"; String units "degrees_east"; String source "Section 4.11"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Mean longitude of the 10km segment."; String origname "lon_mean"; String fullnamepath "/quality_assessment/gt3l/lon_mean"; String coordinates "quality_assessment_gt3l_delta_time quality_assessment_gt3l_lat_mean"; } quality_assessment_gt3l_signal_selection_source_fraction_0 { String long_name "Signal Selection Source Fraction 0"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to zero."; String origname "signal_selection_source_fraction_0"; String fullnamepath "/quality_assessment/gt3l/signal_selection_source_fraction_0"; String coordinates "quality_assessment_gt3l_delta_time quality_assessment_gt3l_lat_mean quality_assessment_gt3l_lon_mean"; } quality_assessment_gt3l_signal_selection_source_fraction_1 { String long_name "Signal Selection Source Fraction 1"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 1."; String origname "signal_selection_source_fraction_1"; String fullnamepath "/quality_assessment/gt3l/signal_selection_source_fraction_1"; String coordinates "quality_assessment_gt3l_delta_time quality_assessment_gt3l_lat_mean quality_assessment_gt3l_lon_mean"; } quality_assessment_gt3l_signal_selection_source_fraction_2 { String long_name "Signal Selection Source Fraction 2"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 2."; String origname "signal_selection_source_fraction_2"; String fullnamepath "/quality_assessment/gt3l/signal_selection_source_fraction_2"; String coordinates "quality_assessment_gt3l_delta_time quality_assessment_gt3l_lat_mean quality_assessment_gt3l_lon_mean"; } quality_assessment_gt3l_lat_mean { String long_name "Latitude Mean"; String standard_name "latitude"; String units "degrees_north"; String source "Section 4.11"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Mean latitude of the 10km segment."; String origname "lat_mean"; String fullnamepath "/quality_assessment/gt3l/lat_mean"; String coordinates "quality_assessment_gt3l_delta_time quality_assessment_gt3l_lon_mean"; } quality_assessment_gt3l_signal_selection_source_fraction_3 { String long_name "Signal Selection Source Fraction 3"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 3."; String origname "signal_selection_source_fraction_3"; String fullnamepath "/quality_assessment/gt3l/signal_selection_source_fraction_3"; String coordinates "quality_assessment_gt3l_delta_time quality_assessment_gt3l_lat_mean quality_assessment_gt3l_lon_mean"; } quality_assessment_gt2l_lon_mean { String long_name "Longitude Mean"; String standard_name "longitude"; String units "degrees_east"; String source "Section 4.11"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Mean longitude of the 10km segment."; String origname "lon_mean"; String fullnamepath "/quality_assessment/gt2l/lon_mean"; String coordinates "quality_assessment_gt2l_delta_time quality_assessment_gt2l_lat_mean"; } quality_assessment_gt2l_signal_selection_source_fraction_0 { String long_name "Signal Selection Source Fraction 0"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to zero."; String origname "signal_selection_source_fraction_0"; String fullnamepath "/quality_assessment/gt2l/signal_selection_source_fraction_0"; String coordinates "quality_assessment_gt2l_delta_time quality_assessment_gt2l_lat_mean quality_assessment_gt2l_lon_mean"; } quality_assessment_gt2l_signal_selection_source_fraction_1 { String long_name "Signal Selection Source Fraction 1"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 1."; String origname "signal_selection_source_fraction_1"; String fullnamepath "/quality_assessment/gt2l/signal_selection_source_fraction_1"; String coordinates "quality_assessment_gt2l_delta_time quality_assessment_gt2l_lat_mean quality_assessment_gt2l_lon_mean"; } quality_assessment_gt2l_signal_selection_source_fraction_2 { String long_name "Signal Selection Source Fraction 2"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 2."; String origname "signal_selection_source_fraction_2"; String fullnamepath "/quality_assessment/gt2l/signal_selection_source_fraction_2"; String coordinates "quality_assessment_gt2l_delta_time quality_assessment_gt2l_lat_mean quality_assessment_gt2l_lon_mean"; } quality_assessment_gt2l_lat_mean { String long_name "Latitude Mean"; String standard_name "latitude"; String units "degrees_north"; String source "Section 4.11"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Mean latitude of the 10km segment."; String origname "lat_mean"; String fullnamepath "/quality_assessment/gt2l/lat_mean"; String coordinates "quality_assessment_gt2l_delta_time quality_assessment_gt2l_lon_mean"; } quality_assessment_gt2l_signal_selection_source_fraction_3 { String long_name "Signal Selection Source Fraction 3"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 3."; String origname "signal_selection_source_fraction_3"; String fullnamepath "/quality_assessment/gt2l/signal_selection_source_fraction_3"; String coordinates "quality_assessment_gt2l_delta_time quality_assessment_gt2l_lat_mean quality_assessment_gt2l_lon_mean"; } quality_assessment_gt3r_lon_mean { String long_name "Longitude Mean"; String standard_name "longitude"; String units "degrees_east"; String source "Section 4.11"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Mean longitude of the 10km segment."; String origname "lon_mean"; String fullnamepath "/quality_assessment/gt3r/lon_mean"; String coordinates "quality_assessment_gt3r_delta_time quality_assessment_gt3r_lat_mean"; } quality_assessment_gt3r_signal_selection_source_fraction_0 { String long_name "Signal Selection Source Fraction 0"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to zero."; String origname "signal_selection_source_fraction_0"; String fullnamepath "/quality_assessment/gt3r/signal_selection_source_fraction_0"; String coordinates "quality_assessment_gt3r_delta_time quality_assessment_gt3r_lat_mean quality_assessment_gt3r_lon_mean"; } quality_assessment_gt3r_signal_selection_source_fraction_1 { String long_name "Signal Selection Source Fraction 1"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 1."; String origname "signal_selection_source_fraction_1"; String fullnamepath "/quality_assessment/gt3r/signal_selection_source_fraction_1"; String coordinates "quality_assessment_gt3r_delta_time quality_assessment_gt3r_lat_mean quality_assessment_gt3r_lon_mean"; } quality_assessment_gt3r_signal_selection_source_fraction_2 { String long_name "Signal Selection Source Fraction 2"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 2."; String origname "signal_selection_source_fraction_2"; String fullnamepath "/quality_assessment/gt3r/signal_selection_source_fraction_2"; String coordinates "quality_assessment_gt3r_delta_time quality_assessment_gt3r_lat_mean quality_assessment_gt3r_lon_mean"; } quality_assessment_gt3r_lat_mean { String long_name "Latitude Mean"; String standard_name "latitude"; String units "degrees_north"; String source "Section 4.11"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Mean latitude of the 10km segment."; String origname "lat_mean"; String fullnamepath "/quality_assessment/gt3r/lat_mean"; String coordinates "quality_assessment_gt3r_delta_time quality_assessment_gt3r_lon_mean"; } quality_assessment_gt3r_signal_selection_source_fraction_3 { String long_name "Signal Selection Source Fraction 3"; String units "1"; String source "section 7.2"; Float32 valid_min 0.000000000; Float32 valid_max 1.000000000; String contentType "qualityInformation"; String description "The fraction of 20m segments with signal_selection_source equal to 3."; String origname "signal_selection_source_fraction_3"; String fullnamepath "/quality_assessment/gt3r/signal_selection_source_fraction_3"; String coordinates "quality_assessment_gt3r_delta_time quality_assessment_gt3r_lat_mean quality_assessment_gt3r_lon_mean"; } gt3l_land_ice_segments_sigma_geo_h { Float32 _FillValue 3.402823466e+38; String long_name "Vertical Geolocation Error"; String units "meters"; String source "ATBD Section 3.10"; String contentType "qualityInformation"; String description "Total vertical geolocation error due to PPD and POD, including the effects of horizontal geolocation error on the segment vertical error."; String origname "sigma_geo_h"; String fullnamepath "/gt3l/land_ice_segments/sigma_geo_h"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_h_li_sigma { Float32 _FillValue 3.402823466e+38; String long_name "Expected RMS segment misfit"; String units "meters"; String source "section 4.4"; String contentType "qualityInformation"; String description "Propagated error due to sampling error and FPB correction from the land ice algorithm"; String origname "h_li_sigma"; String fullnamepath "/gt3l/land_ice_segments/h_li_sigma"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_h_mean { Float32 _FillValue 3.402823466e+38; String long_name "Height Mean"; String units "meters"; String source "ATL06 ATBD"; String contentType "modelResult"; String description "Mean surface height, not corrected for first-photon bias or pulse truncation."; String origname "h_mean"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/h_mean"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_signal_selection_source { String long_name "Signal Selection Source"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 2=Signal selection failed using all flagged ATL03 PE, but succeeded using the backup algorithm; 3=All signal-finding strategies failed."; String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_source"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/signal_selection_source"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_snr { Float32 _FillValue 3.402823466e+38; String long_name "SNR"; String units "1"; String source "section 3.6.2"; String contentType "physicalMeasurement"; String description "Signal-to-noise ratio in the final refined window"; String origname "snr"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/snr"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_h_robust_sprd { Float32 _FillValue 3.402823466e+38; String long_name "Robust Spread"; String units "meters"; String source "section 3.6.3"; String contentType "referenceInformation"; String description "RDE of misfit between PE heights and the along-track segment fit."; String origname "h_robust_sprd"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/h_robust_sprd"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_n_seg_pulses { String units "counts"; Float32 _FillValue 3.402823466e+38; String long_name "Number potential segment pulses"; String source "section 3.3.3"; String contentType "referenceInformation"; String description "The number of pulses potentially included in the segment"; String origname "n_seg_pulses"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/n_seg_pulses"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_dh_fit_dx_sigma { Float32 _FillValue 3.402823466e+38; String long_name "Sigma of Along Track Slope"; String units "meters/meters"; String source "section 3.6.4"; String contentType "qualityInformation"; String description "Propagated error in the along-track segment slope"; String origname "dh_fit_dx_sigma"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/dh_fit_dx_sigma"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_snr_significance { Float32 _FillValue 3.402823466e+38; String long_name "SNR Significance"; String units "1"; String source "section 3.6.2"; String contentType "physicalMeasurement"; String description "Probability that signal-finding routine would converge to at least the observed SNR for a random-noise input. Small values indicate a small likelihood of a surface-detection blunder."; String origname "snr_significance"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/snr_significance"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_h_expected_rms { Float32 _FillValue 3.402823466e+38; String long_name "Expected RMS misfit"; String units "meters"; String source "section 3.6.3"; String contentType "qualityInformation"; String description "Expected RMS misfit between PE heights and along-track segment fit"; String origname "h_expected_rms"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/h_expected_rms"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_dh_fit_dy { Float32 _FillValue 3.402823466e+38; String long_name "Across Track Slope"; String units "meters/meters"; String source "section 3.7"; String contentType "physicalMeasurement"; String description "Across track slope from segment fits to weak and strong beam; the same slope is reported for both laser beams in each pair"; String origname "dh_fit_dy"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/dh_fit_dy"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_sigma_h_mean { Float32 _FillValue 3.402823466e+38; String long_name "Height Error"; String units "meters"; String source "section 3.6.4"; String contentType "qualityInformation"; String description "Propagated height error due to PE-height sampling error for height from the along-track fit, not including geolocation-induced error"; String origname "sigma_h_mean"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/sigma_h_mean"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_h_rms_misfit { Float32 _FillValue 3.402823466e+38; String long_name "RMS Misfit"; String units "meters"; String source "section 3.6.3"; String contentType "qualityInformation"; String description "RMS misfit between PE heights and along- track segment fit"; String origname "h_rms_misfit"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/h_rms_misfit"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_signal_selection_source_status { String long_name "Signal Selection Source Status"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 4; String contentType "qualityInformation"; String description "Indicates the status of the last signal selection algorithm attempted (see signal_selection_source). The definition of flag is different for each source and are defined in each of the signal_selection_status flags. (See Land Ice ATBD Table 3-2)."; String origname "signal_selection_source_status"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/signal_selection_source_status"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_dh_fit_dx { Float32 _FillValue 3.402823466e+38; String long_name "Along Track Slope"; String units "meters/meters"; String source "section 3.3.5.1"; String contentType "physicalMeasurement"; String description "Along-track slope from along-track segment fit"; String origname "dh_fit_dx"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/dh_fit_dx"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_n_fit_photons { Int32 _FillValue 2147483647; String long_name "Number of Photons in Fit"; String units "1"; String source "section 3.3.5.2"; String contentType "physicalMeasurement"; String description "Number of PEs used in determining h_li, after editing"; String origname "n_fit_photons"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/n_fit_photons"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_fit_statistics_w_surface_window_final { Float32 _FillValue 3.402823466e+38; String long_name "Surface Window Width"; String units "meters"; String source "section 3.3.5.2"; String contentType "physicalMeasurement"; String description "Width of the surface window, top to bottom"; String origname "w_surface_window_final"; String fullnamepath "/gt3l/land_ice_segments/fit_statistics/w_surface_window_final"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_longitude { String long_name "Longitude"; String standard_name "longitude"; String units "degrees_east"; String source "section 3.10"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Longitude of segment center, , WGS84, East=+"; String origname "longitude"; String fullnamepath "/gt3l/land_ice_segments/longitude"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude"; } gt3l_land_ice_segments_latitude { String long_name "Latitude"; String standard_name "latitude"; String units "degrees_north"; String source "section 3.10"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Latitude of segment center, WGS84, North=+,"; String origname "latitude"; String fullnamepath "/gt3l/land_ice_segments/latitude"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_h_li { Float32 _FillValue 3.402823466e+38; String long_name "Land Ice height"; String units "meters"; String source "section 4.4"; String contentType "physicalMeasurement"; String description "Standard land-ice segment height determined by land ice algorithm, corrected for first-photon bias, representing the median- based height of the selected PEs"; String origname "h_li"; String fullnamepath "/gt3l/land_ice_segments/h_li"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_ground_track_ref_azimuth { String units "radians"; Float32 _FillValue 3.402823466e+38; String long_name "Azimuth"; String source "ATL03g, Section 3.3"; String contentType "referenceInformation"; String description "The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft)."; String origname "ref_azimuth"; String fullnamepath "/gt3l/land_ice_segments/ground_track/ref_azimuth"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_ground_track_seg_azimuth { Float32 _FillValue 3.402823466e+38; String long_name "Segment Azimuth"; String units "degrees"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "Azimuth of the pair-track, east of local north."; String origname "seg_azimuth"; String fullnamepath "/gt3l/land_ice_segments/ground_track/seg_azimuth"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_ground_track_sigma_geo_at { Float32 _FillValue 3.402823466e+38; String long_name "Along Track Geolocation Error"; String units "meters"; String source "section 3.10"; String contentType "qualityInformation"; String description "Along-track component of the geolocation error."; String origname "sigma_geo_at"; String fullnamepath "/gt3l/land_ice_segments/ground_track/sigma_geo_at"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_ground_track_sigma_geo_r { Float32 _FillValue 3.402823466e+38; String long_name "Radial Orbit Error"; String units "meters"; String source "ATBD Section 3.10, (ATL03 sigma_h)"; String contentType "qualityInformation"; String description "Radial orbit component of the geolocation error."; String origname "sigma_geo_r"; String fullnamepath "/gt3l/land_ice_segments/ground_track/sigma_geo_r"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_ground_track_ref_coelv { Float32 _FillValue 3.402823466e+38; String long_name "Co-elevation"; String units "radians"; String source "ATL03g, Section 3.3"; String contentType "referenceInformation"; String description "Coelevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot."; String origname "ref_coelv"; String fullnamepath "/gt3l/land_ice_segments/ground_track/ref_coelv"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_ground_track_sigma_geo_xt { Float32 _FillValue 3.402823466e+38; String long_name "Across Track Geolocation Error"; String units "meters"; String source "section 3.10"; String contentType "qualityInformation"; String description "Across-track component of the geolocation error."; String origname "sigma_geo_xt"; String fullnamepath "/gt3l/land_ice_segments/ground_track/sigma_geo_xt"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_ground_track_x_atc { Float64 _FillValue 1.7976931348623157e+308; String long_name "X Along Track"; String units "meters"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "The along-track x-coordinate of the segment, measured parallel to the RGT, measured from the ascending node of the equatorial crossing of a given RGT."; String origname "x_atc"; String fullnamepath "/gt3l/land_ice_segments/ground_track/x_atc"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_ground_track_y_atc { Float32 _FillValue 3.402823466e+38; String long_name "Y Along Track"; String units "meters"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "Along-track y coordinate of the segment, relative to the RGT, measured along the perpendicular to the RGT, positive to the right of the RGT."; String origname "y_atc"; String fullnamepath "/gt3l/land_ice_segments/ground_track/y_atc"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_dem_dem_flag { String long_name "DEM Source Flag"; String units "1"; String source "ATL03"; Int16 valid_min 0; Int16 valid_max 4; String contentType "referenceInformation"; String description "Indicates source of the DEM height. Values: 0=None, 1=Arctic, 2=Global, 3=MSS, 4=Antarctic."; String flag_meanings "none arctic global mss antarctic"; Int16 flag_values 0, 1, 2, 3, 4; String origname "dem_flag"; String fullnamepath "/gt3l/land_ice_segments/dem/dem_flag"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_dem_geoid_free2mean { Float32 _FillValue 3.402823466e+38; String long_name "Geoid Free-to-Mean conversion"; String units "meters"; String source "ATL03"; String contentType "modelResult"; String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system. (Add to geoid to get the geoid heights in the mean-tide system.)"; String origname "geoid_free2mean"; String fullnamepath "/gt3l/land_ice_segments/dem/geoid_free2mean"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_dem_dem_h { Float32 _FillValue 3.402823466e+38; String long_name "DEM Height"; String units "meters"; String source "ATL06 ATBD"; String contentType "referenceInformation"; String description "Height of the DEM, interpolated by cubic-spline interpolation in the DEM coordinate system to the PE location. (Best available DEM value in priority of Arctic/Antarctic/Global/MSS)"; String origname "dem_h"; String fullnamepath "/gt3l/land_ice_segments/dem/dem_h"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_dem_geoid_h { Float32 _FillValue 3.402823466e+38; String long_name "Geoid Height"; String units "meters"; String source "EGM2008"; String contentType "referenceInformation"; String description "Geoid height above WGS-84 reference ellipsoid (range -107 to 86m) in the tide-free system."; String origname "geoid_h"; String fullnamepath "/gt3l/land_ice_segments/dem/geoid_h"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_msw_flag { Int16 _FillValue 127; String long_name "Multiple Scattering Warning Flag"; String units "1"; String source "ATL09"; Int16 valid_min -1; Int16 valid_max 5; String contentType "referenceInformation"; String description "Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight."; String flag_meanings "cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5"; Int16 flag_values -1, 0, 1, 2, 3, 4, 5; String origname "msw_flag"; String fullnamepath "/gt3l/land_ice_segments/geophysical/msw_flag"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_layer_flag { String units "1"; String source "ATL09"; Int16 _FillValue 127; String long_name "Consolidated cloud flag"; Int16 valid_min 0; Int16 valid_max 1; String contentType "referenceInformation"; String description "This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow."; String flag_meanings "likely_clear likely_cloudy"; Int16 flag_values 0, 1; String origname "layer_flag"; String fullnamepath "/gt3l/land_ice_segments/geophysical/layer_flag"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_bsnow_conf { Int16 _FillValue 127; String long_name "Blowing Snow confidence"; String units "1"; String source "ATL09"; String contentType "referenceInformation"; String description "Confidence flag for presence of blowing snow"; String origname "bsnow_conf"; String fullnamepath "/gt3l/land_ice_segments/geophysical/bsnow_conf"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_bsnow_h { Float32 _FillValue 3.402823466e+38; String long_name "Blowing Snow Layer Top Height"; String units "meters"; String source "ATL09"; String contentType "referenceInformation"; String description "Blowing snow layer top height"; String origname "bsnow_h"; String fullnamepath "/gt3l/land_ice_segments/geophysical/bsnow_h"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_tide_ocean { Float32 _FillValue 3.402823466e+38; String long_name "Ocean Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.1"; String contentType "referenceInformation"; String description "Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium)."; String origname "tide_ocean"; String fullnamepath "/gt3l/land_ice_segments/geophysical/tide_ocean"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_tide_earth { Float32 _FillValue 3.402823466e+38; String long_name "Earth Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.3"; String contentType "referenceInformation"; String description "Solid earth tides in the tide-free system."; String origname "tide_earth"; String fullnamepath "/gt3l/land_ice_segments/geophysical/tide_earth"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_solar_azimuth { Float32 _FillValue 3.402823466e+38; String long_name "solar azimuth"; String units "degrees_east"; String source "ATL03"; String contentType "referenceInformation"; String description "The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot."; String origname "solar_azimuth"; String fullnamepath "/gt3l/land_ice_segments/geophysical/solar_azimuth"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_r_eff { Float32 _FillValue 3.402823466e+38; String long_name "Effective uncorrected reflectance"; String units "1"; String source "section 3.1.5.4"; String contentType "referenceInformation"; String description "Effective reflectance, uncorrected for atmospheric effects."; String origname "r_eff"; String fullnamepath "/gt3l/land_ice_segments/geophysical/r_eff"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_dac { Float32 _FillValue 3.402823466e+38; String long_name "Dynamic Atmosphere Correction"; String units "meters"; String source "ATL03, 6.3.2"; String contentType "referenceInformation"; String description "Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect."; String origname "dac"; String fullnamepath "/gt3l/land_ice_segments/geophysical/dac"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_tide_load { Float32 _FillValue 3.402823466e+38; String long_name "Load Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.4"; String contentType "referenceInformation"; String description "Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm)."; String origname "tide_load"; String fullnamepath "/gt3l/land_ice_segments/geophysical/tide_load"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_tide_earth_free2mean { Float32 _FillValue 3.402823466e+38; String long_name "Earth Tide Free-to-Mean conversion"; String units "meters"; String source "ATL03"; String contentType "referenceInformation"; String description "Additive value to convert solid earth tide from the tide-free system to the mean tide system. (Add to tide_earth to get solid earth tides in the mean-tide system.)"; String origname "tide_earth_free2mean"; String fullnamepath "/gt3l/land_ice_segments/geophysical/tide_earth_free2mean"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_bsnow_od { Float32 _FillValue 3.402823466e+38; String long_name "Blowing snow OD"; String units "1"; String source "ATL09"; String contentType "modelResult"; String description "Optical thickness of blowing snow layer."; String origname "bsnow_od"; String fullnamepath "/gt3l/land_ice_segments/geophysical/bsnow_od"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_tide_equilibrium { Float32 _FillValue 3.402823466e+38; String long_name "Equilibrium Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.1"; String contentType "referenceInformation"; String description "Long period equilibrium tide self-consistent with the ocean tide model (+-0.04m)."; String origname "tide_equilibrium"; String fullnamepath "/gt3l/land_ice_segments/geophysical/tide_equilibrium"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_cloud_flg_atm { Int16 _FillValue 127; String long_name "Cloud Flag ATM"; String units "1"; String source "ATL09"; Int16 valid_min 0; Int16 valid_max 10; String contentType "referenceInformation"; String description "Number of layers found from the backscatter profile using the DDA layer finder."; String origname "cloud_flg_atm"; String fullnamepath "/gt3l/land_ice_segments/geophysical/cloud_flg_atm"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_solar_elevation { Float32 _FillValue 3.402823466e+38; String long_name "solar elevation"; String units "degrees"; String source "ATL03"; Float32 valid_min -90.00000000; Float32 valid_max 90.00000000; String contentType "referenceInformation"; String description "Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low-precision value, with approximately TBD degree accuracy."; String origname "solar_elevation"; String fullnamepath "/gt3l/land_ice_segments/geophysical/solar_elevation"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_tide_pole { Float32 _FillValue 3.402823466e+38; String long_name "Solid Earth Pole Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.5"; String contentType "referenceInformation"; String description "Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm)."; String origname "tide_pole"; String fullnamepath "/gt3l/land_ice_segments/geophysical/tide_pole"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_e_bckgrd { Float32 _FillValue 3.402823466e+38; String long_name "Expected background count rate"; String units "hz"; String source "section 3.6.1"; String contentType "referenceInformation"; String description "Expected background count rate based on sun angle, surface slope, for unit surface reflectance"; String origname "e_bckgrd"; String fullnamepath "/gt3l/land_ice_segments/geophysical/e_bckgrd"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_cloud_flg_asr { Int16 _FillValue 127; String long_name "Cloud Flag ASR"; String units "1"; String source "ATL09"; Int16 valid_min 0; Int16 valid_max 5; String contentType "referenceInformation"; String description "Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence"; String flag_meanings "clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence"; Int16 flag_values 0, 1, 2, 3, 4, 5; String origname "cloud_flg_asr"; String fullnamepath "/gt3l/land_ice_segments/geophysical/cloud_flg_asr"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_bckgrd { Float32 _FillValue 3.402823466e+38; String long_name "Background count rate"; String units "hz"; String source "section 3.6.1"; String contentType "referenceInformation"; String description "Background count rate, derived from the ATL03 50-shot-average, interpolated to the segment center."; String origname "bckgrd"; String fullnamepath "/gt3l/land_ice_segments/geophysical/bckgrd"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_geophysical_neutat_delay_total { Float32 _FillValue 3.402823466e+38; String long_name "Total Neutral Atmospheric Delay"; String units "meters"; String source "ATL03a ATBD"; String contentType "referenceInformation"; String description "Total neutral atmosphere delay correction (wet+dry)."; String origname "neutat_delay_total"; String fullnamepath "/gt3l/land_ice_segments/geophysical/neutat_delay_total"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_atl06_quality_summary { String long_name "ATL06_Quality_Summary"; String units "1"; String source "section 4.3"; Int16 valid_min 0; Int16 valid_max 1; String contentType "qualityInformation"; String description "The ATL06_quality_summary parameter indicates the best-quality subset of all ATL06 data. A zero in this parameter implies that no data-quality tests have found a problem with the segment, a one implies that some potential problem has been found. Users who select only segments with zero values for this flag can be relatively certain of obtaining high-quality data, but will likely miss a significant fraction of usable data, particularly in cloudy, rough, or low-surface-reflectance conditions."; String flag_meanings "best_quality potential_problem"; Int16 flag_values 0, 1; String origname "atl06_quality_summary"; String fullnamepath "/gt3l/land_ice_segments/atl06_quality_summary"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_segment_id { Int32 _FillValue 0; String long_name "Reference Point, m"; String units "1"; String source "section 3.1.2.1"; String contentType "referenceInformation"; String description "Segment number, counting from the equator. Equal to the segment_id for the second of the two 20m ATL03 segments included in the 40m ATL06 segment"; String origname "segment_id"; String fullnamepath "/gt3l/land_ice_segments/segment_id"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_bias_correction_fpb_mean_corr { Float32 _FillValue 3.402823466e+38; String long_name "first photon bias mean correction"; String units "meters"; String source "section 3.4.3.1"; String contentType "qualityInformation"; String description "Estimated first-photon bias (fpb) correction to mean segment height"; String origname "fpb_mean_corr"; String fullnamepath "/gt3l/land_ice_segments/bias_correction/fpb_mean_corr"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_bias_correction_fpb_mean_corr_sigma { String units "meters"; Float32 _FillValue 3.402823466e+38; String long_name "fpb mean corr sigma"; String source "section 3.4.3.1"; String contentType "qualityInformation"; String description "Estimated error in fpb_mean_corr"; String origname "fpb_mean_corr_sigma"; String fullnamepath "/gt3l/land_ice_segments/bias_correction/fpb_mean_corr_sigma"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_bias_correction_fpb_med_corr { Float32 _FillValue 3.402823466e+38; String long_name "fpb median corr"; String units "meters"; String source "section 3.4.3.2"; String contentType "qualityInformation"; String description "First-photon-bias correction giving the difference between the mean segment height and the corrected median height"; String origname "fpb_med_corr"; String fullnamepath "/gt3l/land_ice_segments/bias_correction/fpb_med_corr"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_bias_correction_fpb_med_corr_sigma { Float32 _FillValue 3.402823466e+38; String long_name "fpb median corr sigma"; String units "meters"; String source "section 3.4.3.2"; String contentType "qualityInformation"; String description "Estimated error in fpb_med_corr"; String origname "fpb_med_corr_sigma"; String fullnamepath "/gt3l/land_ice_segments/bias_correction/fpb_med_corr_sigma"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_bias_correction_fpb_n_corr { Float32 _FillValue 3.402823466e+38; String long_name "fpb number photons corr"; String units "counts"; String source "section 4.3.3.3"; String contentType "qualityInformation"; String description "Estimated window photon count after first-photon-bias correction"; String origname "fpb_n_corr"; String fullnamepath "/gt3l/land_ice_segments/bias_correction/fpb_n_corr"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_bias_correction_tx_mean_corr { Float32 _FillValue 3.402823466e+38; String long_name "tx shape mean correction"; String units "meters"; String source "section 3.5"; String contentType "qualityInformation"; String description "Estimate of the difference between the mean of the full-waveform transmit-pulse and the mean of a broadened, truncated waveform consistent with the received pulse"; String origname "tx_mean_corr"; String fullnamepath "/gt3l/land_ice_segments/bias_correction/tx_mean_corr"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_bias_correction_med_r_fit { Float32 _FillValue 3.402823466e+38; String long_name "mean median residual"; String units "meters"; String source "section 3.3.5"; String contentType "qualityInformation"; String description "Difference between uncorrected mean and median of linear fit residuals"; String origname "med_r_fit"; String fullnamepath "/gt3l/land_ice_segments/bias_correction/med_r_fit"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_land_ice_segments_bias_correction_tx_med_corr { Float32 _FillValue 3.402823466e+38; String long_name "tx shape median correction"; String units "meters"; String source "section 3.5"; String contentType "qualityInformation"; String description "Estimate of the difference between the median of the full-waveform transmit-pulse mean and the median of a broadened, truncated waveform consistent with the received pulse"; String origname "tx_med_corr"; String fullnamepath "/gt3l/land_ice_segments/bias_correction/tx_med_corr"; String coordinates "gt3l_land_ice_segments_delta_time gt3l_land_ice_segments_latitude gt3l_land_ice_segments_longitude"; } gt3l_residual_histogram_count { Int32 _FillValue 2147483647; String long_name "Bin Counts"; String units "counts"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Residual count falling with each histogram bin. The top height of each histogram bin may be found in the bin_top_h dataset."; String origname "count"; String fullnamepath "/gt3l/residual_histogram/count"; String coordinates "gt3l_residual_histogram_delta_time gt3l_residual_histogram_lat_mean gt3l_residual_histogram_lon_mean"; } gt3l_residual_histogram_lat_mean { String long_name "Latitude Mean"; String standard_name "latitude"; String units "degrees_north"; String source "Section 4.11"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Mean latitude of the segments included in the histogram"; String origname "lat_mean"; String fullnamepath "/gt3l/residual_histogram/lat_mean"; String coordinates "gt3l_residual_histogram_delta_time gt3l_residual_histogram_lon_mean"; } gt3l_residual_histogram_x_atc_mean { String long_name "Along Track Coordinate Mean"; String units "1"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Mean along-track coordinate of the segments included in the histogram."; String origname "x_atc_mean"; String fullnamepath "/gt3l/residual_histogram/x_atc_mean"; String coordinates "gt3l_residual_histogram_delta_time gt3l_residual_histogram_lat_mean gt3l_residual_histogram_lon_mean"; } gt3l_residual_histogram_segment_id_list { String long_name "Segment ID List"; String units "1"; String source "Section 4.11"; String contentType "referenceInformation"; String description "Segments ids included in each column of the histogram"; Int32 _FillValue 2147483647; String origname "segment_id_list"; String fullnamepath "/gt3l/residual_histogram/segment_id_list"; String coordinates "gt3l_residual_histogram_delta_time gt3l_residual_histogram_lat_mean gt3l_residual_histogram_lon_mean"; } gt3l_residual_histogram_bckgrd_per_m { String long_name "Expected background PEs"; String units "1"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Number of background PE expected for each vertical meter of the histogram based on the observed background rate (bckgrd)."; String origname "bckgrd_per_m"; String fullnamepath "/gt3l/residual_histogram/bckgrd_per_m"; String coordinates "gt3l_residual_histogram_delta_time gt3l_residual_histogram_lat_mean gt3l_residual_histogram_lon_mean"; } gt3l_residual_histogram_pulse_count { String long_name "Number of Histogram Segment Pulses"; String units "counts"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Number of pulses potentially included in the histogram (pulses are counted if they are in the central 20 m of each segment, even if no PE from the pulse are selected)."; String origname "pulse_count"; String fullnamepath "/gt3l/residual_histogram/pulse_count"; String coordinates "gt3l_residual_histogram_delta_time gt3l_residual_histogram_lat_mean gt3l_residual_histogram_lon_mean"; } gt3l_residual_histogram_lon_mean { String long_name "Longitude Mean"; String standard_name "longitude"; String units "degrees_east"; String source "Section 4.11"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Mean longitude of the segments included in the histogram"; String origname "lon_mean"; String fullnamepath "/gt3l/residual_histogram/lon_mean"; String coordinates "gt3l_residual_histogram_delta_time gt3l_residual_histogram_lat_mean"; } gt3l_segment_quality_record_number { String long_name "Land Ice Height Index"; String units "1"; String source "section 4.2"; String contentType "referenceInformation"; String description "For those segments that have adequate signal strength, this parameter gives the record for the pair within the other groups in the granule."; String origname "record_number"; String fullnamepath "/gt3l/segment_quality/record_number"; String coordinates "gt3l_segment_quality_delta_time gt3l_segment_quality_reference_pt_lat gt3l_segment_quality_reference_pt_lon"; } gt3l_segment_quality_reference_pt_lat { String long_name "Latitude"; String units "degrees_north"; String source "section 3.1.9"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "referenceInformation"; String description "Latitude of the reference segment location on the RPT"; String standard_name "latitude"; String origname "reference_pt_lat"; String fullnamepath "/gt3l/segment_quality/reference_pt_lat"; String coordinates "gt3l_segment_quality_delta_time gt3l_segment_quality_reference_pt_lon"; } gt3l_segment_quality_reference_pt_lon { String long_name "Longitude"; String units "degrees_east"; String source "section 3.1.9"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "referenceInformation"; String description "Longitude of the reference segment location on the RPT"; String standard_name "longitude"; String origname "reference_pt_lon"; String fullnamepath "/gt3l/segment_quality/reference_pt_lon"; String coordinates "gt3l_segment_quality_delta_time gt3l_segment_quality_reference_pt_lat"; } gt3l_segment_quality_segment_id { String long_name "Reference Point, m"; String units "1"; String source "section 3.1.2.1"; String contentType "referenceInformation"; String description "Segment number corresponding to the second of two ATL03 segments in the ATL06 segment, counted from the RGT equator crossing"; String origname "segment_id"; String fullnamepath "/gt3l/segment_quality/segment_id"; String coordinates "gt3l_segment_quality_delta_time gt3l_segment_quality_reference_pt_lat gt3l_segment_quality_reference_pt_lon"; } gt3l_segment_quality_signal_selection_source { String long_name "Signal Selection Source"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 2=Signal selection failed using all flagged ATL03 PE, but succeeded using the backup algorithm; 3=All signal-finding strategies failed."; String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_source"; String fullnamepath "/gt3l/segment_quality/signal_selection_source"; String coordinates "gt3l_segment_quality_delta_time gt3l_segment_quality_reference_pt_lat gt3l_segment_quality_reference_pt_lon"; } gt3l_segment_quality_signal_selection_status_signal_selection_status_all { String units "1"; String long_name "Signal Selection Status Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using all ATL03-flagged PEs. 0=Signal selection succeeded using all ATL03-flagged PEs (or algorithm not attempted); 1=Signal selection using all ATL03-flagged PEs failed the 20-meter-spread test; 2=Signal selection using all ATL03-flagged PEs failed the 10-photon-count test; 3=Signal selection using all ATL03-flagged PEs failed both tests"; String flag_meanings "succeeded failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_status_all"; String fullnamepath "/gt3l/segment_quality/signal_selection_status/signal_selection_status_all"; String coordinates "gt3l_segment_quality_delta_time gt3l_segment_quality_reference_pt_lat gt3l_segment_quality_reference_pt_lon"; } gt3l_segment_quality_signal_selection_status_signal_selection_status_backup { String units "1"; String long_name "Signal Selection Backup Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 4; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using the backup signal finder. 0=Signal selection succeeded using the backup signal finder after centering the window on flagged PE (or backup signal finder not attempted); 1=Signal selection succeeded using the backup signal finder after searching for the strongest-signal window using four adjacent ATL03 segments; 2=Signal selection using the backup signal finder failed the 20-meter spread test; 3=Signal selection using the backup signal finder failed the 10-photon count test; 4=Signal selection using the backup signal finder failed both tests"; String flag_meanings "succeeded failed_widen failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3, 4; String origname "signal_selection_status_backup"; String fullnamepath "/gt3l/segment_quality/signal_selection_status/signal_selection_status_backup"; String coordinates "gt3l_segment_quality_delta_time gt3l_segment_quality_reference_pt_lat gt3l_segment_quality_reference_pt_lon"; } gt3l_segment_quality_signal_selection_status_signal_selection_status_confident { String units "1"; String long_name "Signal Selection Confident Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using low or better PEs. 0=Signal selection succeeded using ATL03 low-or-better confidence PEs; 1=Signal selection using ATL03 low-or-better confidence PEs failed the 20-meter-spread test; 2=Signal selection using ATL03 low-or-better confidence PEs failed the 10-photon-count test; 3=Signal selection using ATL03 low-or-better confidence PEs failed both tests"; String flag_meanings "succeeded failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_status_confident"; String fullnamepath "/gt3l/segment_quality/signal_selection_status/signal_selection_status_confident"; String coordinates "gt3l_segment_quality_delta_time gt3l_segment_quality_reference_pt_lat gt3l_segment_quality_reference_pt_lon"; } gt2l_land_ice_segments_sigma_geo_h { Float32 _FillValue 3.402823466e+38; String long_name "Vertical Geolocation Error"; String units "meters"; String source "ATBD Section 3.10"; String contentType "qualityInformation"; String description "Total vertical geolocation error due to PPD and POD, including the effects of horizontal geolocation error on the segment vertical error."; String origname "sigma_geo_h"; String fullnamepath "/gt2l/land_ice_segments/sigma_geo_h"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_h_li_sigma { Float32 _FillValue 3.402823466e+38; String long_name "Expected RMS segment misfit"; String units "meters"; String source "section 4.4"; String contentType "qualityInformation"; String description "Propagated error due to sampling error and FPB correction from the land ice algorithm"; String origname "h_li_sigma"; String fullnamepath "/gt2l/land_ice_segments/h_li_sigma"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_h_mean { Float32 _FillValue 3.402823466e+38; String long_name "Height Mean"; String units "meters"; String source "ATL06 ATBD"; String contentType "modelResult"; String description "Mean surface height, not corrected for first-photon bias or pulse truncation."; String origname "h_mean"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/h_mean"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_signal_selection_source { String long_name "Signal Selection Source"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 2=Signal selection failed using all flagged ATL03 PE, but succeeded using the backup algorithm; 3=All signal-finding strategies failed."; String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_source"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/signal_selection_source"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_snr { Float32 _FillValue 3.402823466e+38; String long_name "SNR"; String units "1"; String source "section 3.6.2"; String contentType "physicalMeasurement"; String description "Signal-to-noise ratio in the final refined window"; String origname "snr"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/snr"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_h_robust_sprd { Float32 _FillValue 3.402823466e+38; String long_name "Robust Spread"; String units "meters"; String source "section 3.6.3"; String contentType "referenceInformation"; String description "RDE of misfit between PE heights and the along-track segment fit."; String origname "h_robust_sprd"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/h_robust_sprd"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_n_seg_pulses { String units "counts"; Float32 _FillValue 3.402823466e+38; String long_name "Number potential segment pulses"; String source "section 3.3.3"; String contentType "referenceInformation"; String description "The number of pulses potentially included in the segment"; String origname "n_seg_pulses"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/n_seg_pulses"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_dh_fit_dx_sigma { Float32 _FillValue 3.402823466e+38; String long_name "Sigma of Along Track Slope"; String units "meters/meters"; String source "section 3.6.4"; String contentType "qualityInformation"; String description "Propagated error in the along-track segment slope"; String origname "dh_fit_dx_sigma"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/dh_fit_dx_sigma"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_snr_significance { Float32 _FillValue 3.402823466e+38; String long_name "SNR Significance"; String units "1"; String source "section 3.6.2"; String contentType "physicalMeasurement"; String description "Probability that signal-finding routine would converge to at least the observed SNR for a random-noise input. Small values indicate a small likelihood of a surface-detection blunder."; String origname "snr_significance"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/snr_significance"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_h_expected_rms { Float32 _FillValue 3.402823466e+38; String long_name "Expected RMS misfit"; String units "meters"; String source "section 3.6.3"; String contentType "qualityInformation"; String description "Expected RMS misfit between PE heights and along-track segment fit"; String origname "h_expected_rms"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/h_expected_rms"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_dh_fit_dy { Float32 _FillValue 3.402823466e+38; String long_name "Across Track Slope"; String units "meters/meters"; String source "section 3.7"; String contentType "physicalMeasurement"; String description "Across track slope from segment fits to weak and strong beam; the same slope is reported for both laser beams in each pair"; String origname "dh_fit_dy"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/dh_fit_dy"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_sigma_h_mean { Float32 _FillValue 3.402823466e+38; String long_name "Height Error"; String units "meters"; String source "section 3.6.4"; String contentType "qualityInformation"; String description "Propagated height error due to PE-height sampling error for height from the along-track fit, not including geolocation-induced error"; String origname "sigma_h_mean"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/sigma_h_mean"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_h_rms_misfit { Float32 _FillValue 3.402823466e+38; String long_name "RMS Misfit"; String units "meters"; String source "section 3.6.3"; String contentType "qualityInformation"; String description "RMS misfit between PE heights and along- track segment fit"; String origname "h_rms_misfit"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/h_rms_misfit"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_signal_selection_source_status { String long_name "Signal Selection Source Status"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 4; String contentType "qualityInformation"; String description "Indicates the status of the last signal selection algorithm attempted (see signal_selection_source). The definition of flag is different for each source and are defined in each of the signal_selection_status flags. (See Land Ice ATBD Table 3-2)."; String origname "signal_selection_source_status"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/signal_selection_source_status"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_dh_fit_dx { Float32 _FillValue 3.402823466e+38; String long_name "Along Track Slope"; String units "meters/meters"; String source "section 3.3.5.1"; String contentType "physicalMeasurement"; String description "Along-track slope from along-track segment fit"; String origname "dh_fit_dx"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/dh_fit_dx"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_n_fit_photons { Int32 _FillValue 2147483647; String long_name "Number of Photons in Fit"; String units "1"; String source "section 3.3.5.2"; String contentType "physicalMeasurement"; String description "Number of PEs used in determining h_li, after editing"; String origname "n_fit_photons"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/n_fit_photons"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_fit_statistics_w_surface_window_final { Float32 _FillValue 3.402823466e+38; String long_name "Surface Window Width"; String units "meters"; String source "section 3.3.5.2"; String contentType "physicalMeasurement"; String description "Width of the surface window, top to bottom"; String origname "w_surface_window_final"; String fullnamepath "/gt2l/land_ice_segments/fit_statistics/w_surface_window_final"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_longitude { String long_name "Longitude"; String standard_name "longitude"; String units "degrees_east"; String source "section 3.10"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Longitude of segment center, , WGS84, East=+"; String origname "longitude"; String fullnamepath "/gt2l/land_ice_segments/longitude"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude"; } gt2l_land_ice_segments_latitude { String long_name "Latitude"; String standard_name "latitude"; String units "degrees_north"; String source "section 3.10"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Latitude of segment center, WGS84, North=+,"; String origname "latitude"; String fullnamepath "/gt2l/land_ice_segments/latitude"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_h_li { Float32 _FillValue 3.402823466e+38; String long_name "Land Ice height"; String units "meters"; String source "section 4.4"; String contentType "physicalMeasurement"; String description "Standard land-ice segment height determined by land ice algorithm, corrected for first-photon bias, representing the median- based height of the selected PEs"; String origname "h_li"; String fullnamepath "/gt2l/land_ice_segments/h_li"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_ground_track_ref_azimuth { String units "radians"; Float32 _FillValue 3.402823466e+38; String long_name "Azimuth"; String source "ATL03g, Section 3.3"; String contentType "referenceInformation"; String description "The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft)."; String origname "ref_azimuth"; String fullnamepath "/gt2l/land_ice_segments/ground_track/ref_azimuth"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_ground_track_seg_azimuth { Float32 _FillValue 3.402823466e+38; String long_name "Segment Azimuth"; String units "degrees"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "Azimuth of the pair-track, east of local north."; String origname "seg_azimuth"; String fullnamepath "/gt2l/land_ice_segments/ground_track/seg_azimuth"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_ground_track_sigma_geo_at { Float32 _FillValue 3.402823466e+38; String long_name "Along Track Geolocation Error"; String units "meters"; String source "section 3.10"; String contentType "qualityInformation"; String description "Along-track component of the geolocation error."; String origname "sigma_geo_at"; String fullnamepath "/gt2l/land_ice_segments/ground_track/sigma_geo_at"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_ground_track_sigma_geo_r { Float32 _FillValue 3.402823466e+38; String long_name "Radial Orbit Error"; String units "meters"; String source "ATBD Section 3.10, (ATL03 sigma_h)"; String contentType "qualityInformation"; String description "Radial orbit component of the geolocation error."; String origname "sigma_geo_r"; String fullnamepath "/gt2l/land_ice_segments/ground_track/sigma_geo_r"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_ground_track_ref_coelv { Float32 _FillValue 3.402823466e+38; String long_name "Co-elevation"; String units "radians"; String source "ATL03g, Section 3.3"; String contentType "referenceInformation"; String description "Coelevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot."; String origname "ref_coelv"; String fullnamepath "/gt2l/land_ice_segments/ground_track/ref_coelv"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_ground_track_sigma_geo_xt { Float32 _FillValue 3.402823466e+38; String long_name "Across Track Geolocation Error"; String units "meters"; String source "section 3.10"; String contentType "qualityInformation"; String description "Across-track component of the geolocation error."; String origname "sigma_geo_xt"; String fullnamepath "/gt2l/land_ice_segments/ground_track/sigma_geo_xt"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_ground_track_x_atc { Float64 _FillValue 1.7976931348623157e+308; String long_name "X Along Track"; String units "meters"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "The along-track x-coordinate of the segment, measured parallel to the RGT, measured from the ascending node of the equatorial crossing of a given RGT."; String origname "x_atc"; String fullnamepath "/gt2l/land_ice_segments/ground_track/x_atc"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_ground_track_y_atc { Float32 _FillValue 3.402823466e+38; String long_name "Y Along Track"; String units "meters"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "Along-track y coordinate of the segment, relative to the RGT, measured along the perpendicular to the RGT, positive to the right of the RGT."; String origname "y_atc"; String fullnamepath "/gt2l/land_ice_segments/ground_track/y_atc"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_dem_dem_flag { String long_name "DEM Source Flag"; String units "1"; String source "ATL03"; Int16 valid_min 0; Int16 valid_max 4; String contentType "referenceInformation"; String description "Indicates source of the DEM height. Values: 0=None, 1=Arctic, 2=Global, 3=MSS, 4=Antarctic."; String flag_meanings "none arctic global mss antarctic"; Int16 flag_values 0, 1, 2, 3, 4; String origname "dem_flag"; String fullnamepath "/gt2l/land_ice_segments/dem/dem_flag"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_dem_geoid_free2mean { Float32 _FillValue 3.402823466e+38; String long_name "Geoid Free-to-Mean conversion"; String units "meters"; String source "ATL03"; String contentType "modelResult"; String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system. (Add to geoid to get the geoid heights in the mean-tide system.)"; String origname "geoid_free2mean"; String fullnamepath "/gt2l/land_ice_segments/dem/geoid_free2mean"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_dem_dem_h { Float32 _FillValue 3.402823466e+38; String long_name "DEM Height"; String units "meters"; String source "ATL06 ATBD"; String contentType "referenceInformation"; String description "Height of the DEM, interpolated by cubic-spline interpolation in the DEM coordinate system to the PE location. (Best available DEM value in priority of Arctic/Antarctic/Global/MSS)"; String origname "dem_h"; String fullnamepath "/gt2l/land_ice_segments/dem/dem_h"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_dem_geoid_h { Float32 _FillValue 3.402823466e+38; String long_name "Geoid Height"; String units "meters"; String source "EGM2008"; String contentType "referenceInformation"; String description "Geoid height above WGS-84 reference ellipsoid (range -107 to 86m) in the tide-free system."; String origname "geoid_h"; String fullnamepath "/gt2l/land_ice_segments/dem/geoid_h"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_msw_flag { Int16 _FillValue 127; String long_name "Multiple Scattering Warning Flag"; String units "1"; String source "ATL09"; Int16 valid_min -1; Int16 valid_max 5; String contentType "referenceInformation"; String description "Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight."; String flag_meanings "cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5"; Int16 flag_values -1, 0, 1, 2, 3, 4, 5; String origname "msw_flag"; String fullnamepath "/gt2l/land_ice_segments/geophysical/msw_flag"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_layer_flag { String units "1"; String source "ATL09"; Int16 _FillValue 127; String long_name "Consolidated cloud flag"; Int16 valid_min 0; Int16 valid_max 1; String contentType "referenceInformation"; String description "This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow."; String flag_meanings "likely_clear likely_cloudy"; Int16 flag_values 0, 1; String origname "layer_flag"; String fullnamepath "/gt2l/land_ice_segments/geophysical/layer_flag"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_bsnow_conf { Int16 _FillValue 127; String long_name "Blowing Snow confidence"; String units "1"; String source "ATL09"; String contentType "referenceInformation"; String description "Confidence flag for presence of blowing snow"; String origname "bsnow_conf"; String fullnamepath "/gt2l/land_ice_segments/geophysical/bsnow_conf"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_bsnow_h { Float32 _FillValue 3.402823466e+38; String long_name "Blowing Snow Layer Top Height"; String units "meters"; String source "ATL09"; String contentType "referenceInformation"; String description "Blowing snow layer top height"; String origname "bsnow_h"; String fullnamepath "/gt2l/land_ice_segments/geophysical/bsnow_h"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_tide_ocean { Float32 _FillValue 3.402823466e+38; String long_name "Ocean Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.1"; String contentType "referenceInformation"; String description "Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium)."; String origname "tide_ocean"; String fullnamepath "/gt2l/land_ice_segments/geophysical/tide_ocean"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_tide_earth { Float32 _FillValue 3.402823466e+38; String long_name "Earth Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.3"; String contentType "referenceInformation"; String description "Solid earth tides in the tide-free system."; String origname "tide_earth"; String fullnamepath "/gt2l/land_ice_segments/geophysical/tide_earth"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_solar_azimuth { Float32 _FillValue 3.402823466e+38; String long_name "solar azimuth"; String units "degrees_east"; String source "ATL03"; String contentType "referenceInformation"; String description "The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot."; String origname "solar_azimuth"; String fullnamepath "/gt2l/land_ice_segments/geophysical/solar_azimuth"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_r_eff { Float32 _FillValue 3.402823466e+38; String long_name "Effective uncorrected reflectance"; String units "1"; String source "section 3.1.5.4"; String contentType "referenceInformation"; String description "Effective reflectance, uncorrected for atmospheric effects."; String origname "r_eff"; String fullnamepath "/gt2l/land_ice_segments/geophysical/r_eff"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_dac { Float32 _FillValue 3.402823466e+38; String long_name "Dynamic Atmosphere Correction"; String units "meters"; String source "ATL03, 6.3.2"; String contentType "referenceInformation"; String description "Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect."; String origname "dac"; String fullnamepath "/gt2l/land_ice_segments/geophysical/dac"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_tide_load { Float32 _FillValue 3.402823466e+38; String long_name "Load Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.4"; String contentType "referenceInformation"; String description "Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm)."; String origname "tide_load"; String fullnamepath "/gt2l/land_ice_segments/geophysical/tide_load"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_tide_earth_free2mean { Float32 _FillValue 3.402823466e+38; String long_name "Earth Tide Free-to-Mean conversion"; String units "meters"; String source "ATL03"; String contentType "referenceInformation"; String description "Additive value to convert solid earth tide from the tide-free system to the mean tide system. (Add to tide_earth to get solid earth tides in the mean-tide system.)"; String origname "tide_earth_free2mean"; String fullnamepath "/gt2l/land_ice_segments/geophysical/tide_earth_free2mean"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_bsnow_od { Float32 _FillValue 3.402823466e+38; String long_name "Blowing snow OD"; String units "1"; String source "ATL09"; String contentType "modelResult"; String description "Optical thickness of blowing snow layer."; String origname "bsnow_od"; String fullnamepath "/gt2l/land_ice_segments/geophysical/bsnow_od"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_tide_equilibrium { Float32 _FillValue 3.402823466e+38; String long_name "Equilibrium Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.1"; String contentType "referenceInformation"; String description "Long period equilibrium tide self-consistent with the ocean tide model (+-0.04m)."; String origname "tide_equilibrium"; String fullnamepath "/gt2l/land_ice_segments/geophysical/tide_equilibrium"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_cloud_flg_atm { Int16 _FillValue 127; String long_name "Cloud Flag ATM"; String units "1"; String source "ATL09"; Int16 valid_min 0; Int16 valid_max 10; String contentType "referenceInformation"; String description "Number of layers found from the backscatter profile using the DDA layer finder."; String origname "cloud_flg_atm"; String fullnamepath "/gt2l/land_ice_segments/geophysical/cloud_flg_atm"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_solar_elevation { Float32 _FillValue 3.402823466e+38; String long_name "solar elevation"; String units "degrees"; String source "ATL03"; Float32 valid_min -90.00000000; Float32 valid_max 90.00000000; String contentType "referenceInformation"; String description "Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low-precision value, with approximately TBD degree accuracy."; String origname "solar_elevation"; String fullnamepath "/gt2l/land_ice_segments/geophysical/solar_elevation"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_tide_pole { Float32 _FillValue 3.402823466e+38; String long_name "Solid Earth Pole Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.5"; String contentType "referenceInformation"; String description "Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm)."; String origname "tide_pole"; String fullnamepath "/gt2l/land_ice_segments/geophysical/tide_pole"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_e_bckgrd { Float32 _FillValue 3.402823466e+38; String long_name "Expected background count rate"; String units "hz"; String source "section 3.6.1"; String contentType "referenceInformation"; String description "Expected background count rate based on sun angle, surface slope, for unit surface reflectance"; String origname "e_bckgrd"; String fullnamepath "/gt2l/land_ice_segments/geophysical/e_bckgrd"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_cloud_flg_asr { Int16 _FillValue 127; String long_name "Cloud Flag ASR"; String units "1"; String source "ATL09"; Int16 valid_min 0; Int16 valid_max 5; String contentType "referenceInformation"; String description "Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence"; String flag_meanings "clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence"; Int16 flag_values 0, 1, 2, 3, 4, 5; String origname "cloud_flg_asr"; String fullnamepath "/gt2l/land_ice_segments/geophysical/cloud_flg_asr"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_bckgrd { Float32 _FillValue 3.402823466e+38; String long_name "Background count rate"; String units "hz"; String source "section 3.6.1"; String contentType "referenceInformation"; String description "Background count rate, derived from the ATL03 50-shot-average, interpolated to the segment center."; String origname "bckgrd"; String fullnamepath "/gt2l/land_ice_segments/geophysical/bckgrd"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_geophysical_neutat_delay_total { Float32 _FillValue 3.402823466e+38; String long_name "Total Neutral Atmospheric Delay"; String units "meters"; String source "ATL03a ATBD"; String contentType "referenceInformation"; String description "Total neutral atmosphere delay correction (wet+dry)."; String origname "neutat_delay_total"; String fullnamepath "/gt2l/land_ice_segments/geophysical/neutat_delay_total"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_atl06_quality_summary { String long_name "ATL06_Quality_Summary"; String units "1"; String source "section 4.3"; Int16 valid_min 0; Int16 valid_max 1; String contentType "qualityInformation"; String description "The ATL06_quality_summary parameter indicates the best-quality subset of all ATL06 data. A zero in this parameter implies that no data-quality tests have found a problem with the segment, a one implies that some potential problem has been found. Users who select only segments with zero values for this flag can be relatively certain of obtaining high-quality data, but will likely miss a significant fraction of usable data, particularly in cloudy, rough, or low-surface-reflectance conditions."; String flag_meanings "best_quality potential_problem"; Int16 flag_values 0, 1; String origname "atl06_quality_summary"; String fullnamepath "/gt2l/land_ice_segments/atl06_quality_summary"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_segment_id { Int32 _FillValue 0; String long_name "Reference Point, m"; String units "1"; String source "section 3.1.2.1"; String contentType "referenceInformation"; String description "Segment number, counting from the equator. Equal to the segment_id for the second of the two 20m ATL03 segments included in the 40m ATL06 segment"; String origname "segment_id"; String fullnamepath "/gt2l/land_ice_segments/segment_id"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_bias_correction_fpb_mean_corr { Float32 _FillValue 3.402823466e+38; String long_name "first photon bias mean correction"; String units "meters"; String source "section 3.4.3.1"; String contentType "qualityInformation"; String description "Estimated first-photon bias (fpb) correction to mean segment height"; String origname "fpb_mean_corr"; String fullnamepath "/gt2l/land_ice_segments/bias_correction/fpb_mean_corr"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_bias_correction_fpb_mean_corr_sigma { String units "meters"; Float32 _FillValue 3.402823466e+38; String long_name "fpb mean corr sigma"; String source "section 3.4.3.1"; String contentType "qualityInformation"; String description "Estimated error in fpb_mean_corr"; String origname "fpb_mean_corr_sigma"; String fullnamepath "/gt2l/land_ice_segments/bias_correction/fpb_mean_corr_sigma"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_bias_correction_fpb_med_corr { Float32 _FillValue 3.402823466e+38; String long_name "fpb median corr"; String units "meters"; String source "section 3.4.3.2"; String contentType "qualityInformation"; String description "First-photon-bias correction giving the difference between the mean segment height and the corrected median height"; String origname "fpb_med_corr"; String fullnamepath "/gt2l/land_ice_segments/bias_correction/fpb_med_corr"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_bias_correction_fpb_med_corr_sigma { Float32 _FillValue 3.402823466e+38; String long_name "fpb median corr sigma"; String units "meters"; String source "section 3.4.3.2"; String contentType "qualityInformation"; String description "Estimated error in fpb_med_corr"; String origname "fpb_med_corr_sigma"; String fullnamepath "/gt2l/land_ice_segments/bias_correction/fpb_med_corr_sigma"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_bias_correction_fpb_n_corr { Float32 _FillValue 3.402823466e+38; String long_name "fpb number photons corr"; String units "counts"; String source "section 4.3.3.3"; String contentType "qualityInformation"; String description "Estimated window photon count after first-photon-bias correction"; String origname "fpb_n_corr"; String fullnamepath "/gt2l/land_ice_segments/bias_correction/fpb_n_corr"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_bias_correction_tx_mean_corr { Float32 _FillValue 3.402823466e+38; String long_name "tx shape mean correction"; String units "meters"; String source "section 3.5"; String contentType "qualityInformation"; String description "Estimate of the difference between the mean of the full-waveform transmit-pulse and the mean of a broadened, truncated waveform consistent with the received pulse"; String origname "tx_mean_corr"; String fullnamepath "/gt2l/land_ice_segments/bias_correction/tx_mean_corr"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_bias_correction_med_r_fit { Float32 _FillValue 3.402823466e+38; String long_name "mean median residual"; String units "meters"; String source "section 3.3.5"; String contentType "qualityInformation"; String description "Difference between uncorrected mean and median of linear fit residuals"; String origname "med_r_fit"; String fullnamepath "/gt2l/land_ice_segments/bias_correction/med_r_fit"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_land_ice_segments_bias_correction_tx_med_corr { Float32 _FillValue 3.402823466e+38; String long_name "tx shape median correction"; String units "meters"; String source "section 3.5"; String contentType "qualityInformation"; String description "Estimate of the difference between the median of the full-waveform transmit-pulse mean and the median of a broadened, truncated waveform consistent with the received pulse"; String origname "tx_med_corr"; String fullnamepath "/gt2l/land_ice_segments/bias_correction/tx_med_corr"; String coordinates "gt2l_land_ice_segments_delta_time gt2l_land_ice_segments_latitude gt2l_land_ice_segments_longitude"; } gt2l_residual_histogram_count { Int32 _FillValue 2147483647; String long_name "Bin Counts"; String units "counts"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Residual count falling with each histogram bin. The top height of each histogram bin may be found in the bin_top_h dataset."; String origname "count"; String fullnamepath "/gt2l/residual_histogram/count"; String coordinates "gt2l_residual_histogram_delta_time gt2l_residual_histogram_lat_mean gt2l_residual_histogram_lon_mean"; } gt2l_residual_histogram_lat_mean { String long_name "Latitude Mean"; String standard_name "latitude"; String units "degrees_north"; String source "Section 4.11"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Mean latitude of the segments included in the histogram"; String origname "lat_mean"; String fullnamepath "/gt2l/residual_histogram/lat_mean"; String coordinates "gt2l_residual_histogram_delta_time gt2l_residual_histogram_lon_mean"; } gt2l_residual_histogram_x_atc_mean { String long_name "Along Track Coordinate Mean"; String units "1"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Mean along-track coordinate of the segments included in the histogram."; String origname "x_atc_mean"; String fullnamepath "/gt2l/residual_histogram/x_atc_mean"; String coordinates "gt2l_residual_histogram_delta_time gt2l_residual_histogram_lat_mean gt2l_residual_histogram_lon_mean"; } gt2l_residual_histogram_segment_id_list { String long_name "Segment ID List"; String units "1"; String source "Section 4.11"; String contentType "referenceInformation"; String description "Segments ids included in each column of the histogram"; Int32 _FillValue 2147483647; String origname "segment_id_list"; String fullnamepath "/gt2l/residual_histogram/segment_id_list"; String coordinates "gt2l_residual_histogram_delta_time gt2l_residual_histogram_lat_mean gt2l_residual_histogram_lon_mean"; } gt2l_residual_histogram_bckgrd_per_m { String long_name "Expected background PEs"; String units "1"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Number of background PE expected for each vertical meter of the histogram based on the observed background rate (bckgrd)."; String origname "bckgrd_per_m"; String fullnamepath "/gt2l/residual_histogram/bckgrd_per_m"; String coordinates "gt2l_residual_histogram_delta_time gt2l_residual_histogram_lat_mean gt2l_residual_histogram_lon_mean"; } gt2l_residual_histogram_pulse_count { String long_name "Number of Histogram Segment Pulses"; String units "counts"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Number of pulses potentially included in the histogram (pulses are counted if they are in the central 20 m of each segment, even if no PE from the pulse are selected)."; String origname "pulse_count"; String fullnamepath "/gt2l/residual_histogram/pulse_count"; String coordinates "gt2l_residual_histogram_delta_time gt2l_residual_histogram_lat_mean gt2l_residual_histogram_lon_mean"; } gt2l_residual_histogram_lon_mean { String long_name "Longitude Mean"; String standard_name "longitude"; String units "degrees_east"; String source "Section 4.11"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Mean longitude of the segments included in the histogram"; String origname "lon_mean"; String fullnamepath "/gt2l/residual_histogram/lon_mean"; String coordinates "gt2l_residual_histogram_delta_time gt2l_residual_histogram_lat_mean"; } gt2l_segment_quality_record_number { String long_name "Land Ice Height Index"; String units "1"; String source "section 4.2"; String contentType "referenceInformation"; String description "For those segments that have adequate signal strength, this parameter gives the record for the pair within the other groups in the granule."; String origname "record_number"; String fullnamepath "/gt2l/segment_quality/record_number"; String coordinates "gt2l_segment_quality_delta_time gt2l_segment_quality_reference_pt_lat gt2l_segment_quality_reference_pt_lon"; } gt2l_segment_quality_reference_pt_lat { String long_name "Latitude"; String units "degrees_north"; String source "section 3.1.9"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "referenceInformation"; String description "Latitude of the reference segment location on the RPT"; String standard_name "latitude"; String origname "reference_pt_lat"; String fullnamepath "/gt2l/segment_quality/reference_pt_lat"; String coordinates "gt2l_segment_quality_delta_time gt2l_segment_quality_reference_pt_lon"; } gt2l_segment_quality_reference_pt_lon { String long_name "Longitude"; String units "degrees_east"; String source "section 3.1.9"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "referenceInformation"; String description "Longitude of the reference segment location on the RPT"; String standard_name "longitude"; String origname "reference_pt_lon"; String fullnamepath "/gt2l/segment_quality/reference_pt_lon"; String coordinates "gt2l_segment_quality_delta_time gt2l_segment_quality_reference_pt_lat"; } gt2l_segment_quality_segment_id { String long_name "Reference Point, m"; String units "1"; String source "section 3.1.2.1"; String contentType "referenceInformation"; String description "Segment number corresponding to the second of two ATL03 segments in the ATL06 segment, counted from the RGT equator crossing"; String origname "segment_id"; String fullnamepath "/gt2l/segment_quality/segment_id"; String coordinates "gt2l_segment_quality_delta_time gt2l_segment_quality_reference_pt_lat gt2l_segment_quality_reference_pt_lon"; } gt2l_segment_quality_signal_selection_source { String long_name "Signal Selection Source"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 2=Signal selection failed using all flagged ATL03 PE, but succeeded using the backup algorithm; 3=All signal-finding strategies failed."; String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_source"; String fullnamepath "/gt2l/segment_quality/signal_selection_source"; String coordinates "gt2l_segment_quality_delta_time gt2l_segment_quality_reference_pt_lat gt2l_segment_quality_reference_pt_lon"; } gt2l_segment_quality_signal_selection_status_signal_selection_status_all { String units "1"; String long_name "Signal Selection Status Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using all ATL03-flagged PEs. 0=Signal selection succeeded using all ATL03-flagged PEs (or algorithm not attempted); 1=Signal selection using all ATL03-flagged PEs failed the 20-meter-spread test; 2=Signal selection using all ATL03-flagged PEs failed the 10-photon-count test; 3=Signal selection using all ATL03-flagged PEs failed both tests"; String flag_meanings "succeeded failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_status_all"; String fullnamepath "/gt2l/segment_quality/signal_selection_status/signal_selection_status_all"; String coordinates "gt2l_segment_quality_delta_time gt2l_segment_quality_reference_pt_lat gt2l_segment_quality_reference_pt_lon"; } gt2l_segment_quality_signal_selection_status_signal_selection_status_backup { String units "1"; String long_name "Signal Selection Backup Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 4; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using the backup signal finder. 0=Signal selection succeeded using the backup signal finder after centering the window on flagged PE (or backup signal finder not attempted); 1=Signal selection succeeded using the backup signal finder after searching for the strongest-signal window using four adjacent ATL03 segments; 2=Signal selection using the backup signal finder failed the 20-meter spread test; 3=Signal selection using the backup signal finder failed the 10-photon count test; 4=Signal selection using the backup signal finder failed both tests"; String flag_meanings "succeeded failed_widen failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3, 4; String origname "signal_selection_status_backup"; String fullnamepath "/gt2l/segment_quality/signal_selection_status/signal_selection_status_backup"; String coordinates "gt2l_segment_quality_delta_time gt2l_segment_quality_reference_pt_lat gt2l_segment_quality_reference_pt_lon"; } gt2l_segment_quality_signal_selection_status_signal_selection_status_confident { String units "1"; String long_name "Signal Selection Confident Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using low or better PEs. 0=Signal selection succeeded using ATL03 low-or-better confidence PEs; 1=Signal selection using ATL03 low-or-better confidence PEs failed the 20-meter-spread test; 2=Signal selection using ATL03 low-or-better confidence PEs failed the 10-photon-count test; 3=Signal selection using ATL03 low-or-better confidence PEs failed both tests"; String flag_meanings "succeeded failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_status_confident"; String fullnamepath "/gt2l/segment_quality/signal_selection_status/signal_selection_status_confident"; String coordinates "gt2l_segment_quality_delta_time gt2l_segment_quality_reference_pt_lat gt2l_segment_quality_reference_pt_lon"; } ancillary_data_release { String long_name "Release Number"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Release number of the granule. The release number is incremented when the software or ancillary data used to create the granule has been changed."; String origname "release"; String fullnamepath "/ancillary_data/release"; } ancillary_data_end_geoseg { String long_name "Ending Geolocation Segment"; String units "1"; String source "Derived"; String contentType "auxiliaryInformation"; String description "The ending geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation."; String origname "end_geoseg"; String fullnamepath "/ancillary_data/end_geoseg"; } ancillary_data_version { String long_name "Version"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Version number of this granule within the release. It is a sequential number corresponding to the number of times the granule has been reprocessed for the current release."; String origname "version"; String fullnamepath "/ancillary_data/version"; } ancillary_data_end_region { String long_name "Ending Region"; String units "1"; String source "Derived"; String contentType "auxiliaryInformation"; String description "The ending product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent."; String origname "end_region"; String fullnamepath "/ancillary_data/end_region"; } ancillary_data_atlas_sdp_gps_epoch { String long_name "ATLAS Epoch Offset"; String units "seconds since 1980-01-06T00:00:00.000000Z"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS Standard Data Product (SDP) epoch (2018-01-01:T00.00.00.000000 UTC). Add this value to delta time parameters to compute full gps_seconds (relative to the GPS epoch) for each data point."; String origname "atlas_sdp_gps_epoch"; String fullnamepath "/ancillary_data/atlas_sdp_gps_epoch"; } ancillary_data_end_rgt { String long_name "Ending Reference Groundtrack"; String units "1"; String source "Derived"; Int32 valid_min 1; Int32 valid_max 1387; String contentType "auxiliaryInformation"; String description "The ending reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle."; String origname "end_rgt"; String fullnamepath "/ancillary_data/end_rgt"; } ancillary_data_end_delta_time { String long_name "ATLAS End Time (Actual)"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "Derived"; String contentType "auxiliaryInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch at the last data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String origname "end_delta_time"; String fullnamepath "/ancillary_data/end_delta_time"; } ancillary_data_end_orbit { String long_name "Ending Orbit Number"; String units "1"; String source "Derived"; String contentType "auxiliaryInformation"; String description "The ending orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth."; String origname "end_orbit"; String fullnamepath "/ancillary_data/end_orbit"; } ancillary_data_start_cycle { String long_name "Starting Cycle"; String units "1"; String source "Derived"; Int32 valid_min 0; Int32 valid_max 99; String contentType "auxiliaryInformation"; String description "The starting cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission."; String origname "start_cycle"; String fullnamepath "/ancillary_data/start_cycle"; } ancillary_data_data_end_utc { String long_name "End UTC Time of Granule (CCSDS-A, Actual)"; String units "1"; String source "Derived"; String contentType "auxiliaryInformation"; String description "UTC (in CCSDS-A format) of the last data point within the granule."; String origname "data_end_utc"; String fullnamepath "/ancillary_data/data_end_utc"; } ancillary_data_control { String long_name "Control File"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "PGE-specific control file used to generate this granule. To re-use, replace breaks (BR) with linefeeds."; String origname "control"; String fullnamepath "/ancillary_data/control"; } ancillary_data_start_gpssow { String long_name "Start GPS SOW of Granule (Actual)"; String units "seconds"; String source "Derived"; String contentType "auxiliaryInformation"; String description "GPS seconds-of-week of the first data point in the granule."; String origname "start_gpssow"; String fullnamepath "/ancillary_data/start_gpssow"; } ancillary_data_granule_end_utc { String long_name "End UTC Time of Granule (CCSDS-A, Requested)"; String units "1"; String source "Derived"; String contentType "auxiliaryInformation"; String description "Requested end time (in UTC CCSDS-A) of this granule."; String origname "granule_end_utc"; String fullnamepath "/ancillary_data/granule_end_utc"; } ancillary_data_end_cycle { String long_name "Ending Cycle"; String units "1"; String source "Derived"; Int32 valid_min 0; Int32 valid_max 99; String contentType "auxiliaryInformation"; String description "The ending cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission."; String origname "end_cycle"; String fullnamepath "/ancillary_data/end_cycle"; } ancillary_data_granule_start_utc { String long_name "Start UTC Time of Granule (CCSDS-A, Requested)"; String units "1"; String source "Derived"; String contentType "auxiliaryInformation"; String description "Requested start time (in UTC CCSDS-A) of this granule."; String origname "granule_start_utc"; String fullnamepath "/ancillary_data/granule_start_utc"; } ancillary_data_start_delta_time { String long_name "ATLAS Start Time (Actual)"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "Derived"; String contentType "auxiliaryInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch at the first data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String origname "start_delta_time"; String fullnamepath "/ancillary_data/start_delta_time"; } ancillary_data_start_geoseg { String long_name "Starting Geolocation Segment"; String units "1"; String source "Derived"; String contentType "auxiliaryInformation"; String description "The starting geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation."; String origname "start_geoseg"; String fullnamepath "/ancillary_data/start_geoseg"; } ancillary_data_start_orbit { String long_name "Starting Orbit Number"; String units "1"; String source "Derived"; String contentType "auxiliaryInformation"; String description "The starting orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth."; String origname "start_orbit"; String fullnamepath "/ancillary_data/start_orbit"; } ancillary_data_data_start_utc { String long_name "Start UTC Time of Granule (CCSDS-A, Actual)"; String units "1"; String source "Derived"; String contentType "auxiliaryInformation"; String description "UTC (in CCSDS-A format) of the first data point within the granule."; String origname "data_start_utc"; String fullnamepath "/ancillary_data/data_start_utc"; } ancillary_data_end_gpsweek { String long_name "Ending GPSWeek of Granule (Actual)"; String units "weeks from 1980-01-06"; String source "Derived"; String contentType "auxiliaryInformation"; String description "GPS week number of the last data point in the granule."; String origname "end_gpsweek"; String fullnamepath "/ancillary_data/end_gpsweek"; } ancillary_data_start_rgt { String long_name "Starting Reference Groundtrack"; String units "1"; String source "Derived"; Int32 valid_min 1; Int32 valid_max 1387; String contentType "auxiliaryInformation"; String description "The starting reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle."; String origname "start_rgt"; String fullnamepath "/ancillary_data/start_rgt"; } ancillary_data_end_gpssow { String long_name "Ending GPS SOW of Granule (Actual)"; String units "seconds"; String source "Derived"; String contentType "auxiliaryInformation"; String description "GPS seconds-of-week of the last data point in the granule."; String origname "end_gpssow"; String fullnamepath "/ancillary_data/end_gpssow"; } ancillary_data_land_ice_rbin_width { String long_name "Bin Size"; String units "meters"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Residual histogram bin size"; String origname "rbin_width"; String fullnamepath "/ancillary_data/land_ice/rbin_width"; } ancillary_data_land_ice_sigma_beam { String long_name "Sigma of Gaussian Footprint"; String units "meters"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Spatial sigma of the Gaussian footprint (m)"; String origname "sigma_beam"; String fullnamepath "/ancillary_data/land_ice/sigma_beam"; } ancillary_data_land_ice_qs_lim_hsigma { String long_name "Height Sigma QS Limit"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "atl06_quality_summary limit for testing Height Sigma."; String origname "qs_lim_hsigma"; String fullnamepath "/ancillary_data/land_ice/qs_lim_hsigma"; } ancillary_data_land_ice_fit_maxiter { String long_name "Maximum Iterations of Fit"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Maximum number of iterations in at_seg_fit"; String origname "fit_maxiter"; String fullnamepath "/ancillary_data/land_ice/fit_maxiter"; } ancillary_data_land_ice_txp_maxiter { String long_name "Maximum Iterations"; String units "counts"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Maximum number of iterations in tx_shape_corr"; String origname "txp_maxiter"; String fullnamepath "/ancillary_data/land_ice/txp_maxiter"; } ancillary_data_land_ice_qs_lim_hrs { String long_name "Height Robust Spread QS Limit"; String units "meters"; String source "Operations"; String contentType "auxiliaryInformation"; String description "atl06_quality_summary limit for testing Height Robust Spread."; String origname "qs_lim_hrs"; String fullnamepath "/ancillary_data/land_ice/qs_lim_hrs"; } ancillary_data_land_ice_qs_lim_bsc { String long_name "Blowing Snow Confidence QS Limit"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "atl06_quality_summary limit for testing Blowing Snow Confidence."; String origname "qs_lim_bsc"; String fullnamepath "/ancillary_data/land_ice/qs_lim_bsc"; } ancillary_data_land_ice_qs_lim_snr { String long_name "SNR Significance QS Limit"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "atl06_quality_summary limit for testing SNR Significance."; String origname "qs_lim_snr"; String fullnamepath "/ancillary_data/land_ice/qs_lim_snr"; } ancillary_data_land_ice_n_hist { String long_name "Number of Histogram Bins"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Number of bins in a histogram"; String origname "n_hist"; String fullnamepath "/ancillary_data/land_ice/n_hist"; } ancillary_data_land_ice_min_gain_th { String long_name "Minimum Gain Threshold"; String units "1"; String contentType "auxiliaryInformation"; String description "Minimum estimated gain threshold (3.1.6)"; String source "Operations"; String origname "min_gain_th"; String fullnamepath "/ancillary_data/land_ice/min_gain_th"; } ancillary_data_land_ice_qs_lim_sss { String long_name "Signal Selection Source QS Limit"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "atl06_quality_summary limit for testing Signal Selection Source."; String origname "qs_lim_sss"; String fullnamepath "/ancillary_data/land_ice/qs_lim_sss"; } ancillary_data_land_ice_n_sigmas { String long_name "Number of Sigmas"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Multiplied by sigma_expected to get h_win"; String origname "n_sigmas"; String fullnamepath "/ancillary_data/land_ice/n_sigmas"; } ancillary_data_land_ice_dt_hist { String long_name "Histogram Bin Size"; String units "seconds"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Bin size for histograms (sec)"; String origname "dt_hist"; String fullnamepath "/ancillary_data/land_ice/dt_hist"; } ancillary_data_land_ice_sigma_tx { String long_name "Sigma Tx"; String units "seconds"; String source "Operations"; String contentType "auxiliaryInformation"; String description "RDE of the Tx pulse in ATLAS Spot order (1-6). Calculated as half the difference between the 84th and 16th percentiles of the signal bins."; String origname "sigma_tx"; String fullnamepath "/ancillary_data/land_ice/sigma_tx"; } ancillary_data_land_ice_min_signal_conf { String long_name "Minimum Signal Confidence"; String units "1"; Int32 valid_min 0; Int32 valid_max 4; String contentType "auxiliaryInformation"; String description "Minimum signal confidence level for a photon to be considered valid."; String source "Operations"; String origname "min_signal_conf"; String fullnamepath "/ancillary_data/land_ice/min_signal_conf"; } ancillary_data_land_ice_t_dead { String long_name "Dead Time"; String units "seconds"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Dead time, in ATLAS spot order (1-6). Calculated as the average of the CAL42 per-channel dead times, using the appropriate channels for strong and weak spots."; String origname "t_dead"; String fullnamepath "/ancillary_data/land_ice/t_dead"; } ancillary_data_land_ice_qs_lim_msw { String long_name "Multiple Scattering Warning QS Limit"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "atl06_quality_summary limit for testing Multiple Scattering Warning."; String origname "qs_lim_msw"; String fullnamepath "/ancillary_data/land_ice/qs_lim_msw"; } ancillary_data_land_ice_min_n_sel { String long_name "Mininum Number of Photons"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Minimum number of selected PEs in pe_select"; String origname "min_n_sel"; String fullnamepath "/ancillary_data/land_ice/min_n_sel"; } ancillary_data_land_ice_max_res_ids { String long_name "Max Segments"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Maximum number of segment ids in each residual_histogram"; String origname "max_res_ids"; String fullnamepath "/ancillary_data/land_ice/max_res_ids"; } ancillary_data_land_ice_proc_interval { String long_name "Processing Interval"; String units "seconds"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Processing interval in number of geolocation segments.."; String origname "proc_interval"; String fullnamepath "/ancillary_data/land_ice/proc_interval"; } ancillary_data_land_ice_fpb_maxiter { String long_name "Maximum Iterations for FPB"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Maximum number of iterations in fpb_corr"; String origname "fpb_maxiter"; String fullnamepath "/ancillary_data/land_ice/fpb_maxiter"; } ancillary_data_land_ice_min_n_pe { String long_name "Minimum Photons"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Minimum # PEs for fit"; String origname "min_n_pe"; String fullnamepath "/ancillary_data/land_ice/min_n_pe"; } ancillary_data_land_ice_min_dist { String long_name "Minimum Distance"; String units "meters"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Min dist between first and last selected PEs"; String origname "min_dist"; String fullnamepath "/ancillary_data/land_ice/min_dist"; } ancillary_data_land_ice_nhist_bins { String long_name "Number of Bins"; String units "1"; String source "Operations"; String contentType "auxiliaryInformation"; String description "Number of bins in residual histogram"; String origname "nhist_bins"; String fullnamepath "/ancillary_data/land_ice/nhist_bins"; } ancillary_data_qa_at_interval { String long_name "QA Along-Track Interval"; String units "seconds/cell"; String source "control"; String contentType "auxiliaryInformation"; String description "Statistics time interval for along-track QA data."; String origname "qa_at_interval"; String fullnamepath "/ancillary_data/qa_at_interval"; } ancillary_data_start_region { String long_name "Starting Region"; String units "1"; String source "Derived"; String contentType "auxiliaryInformation"; String description "The starting product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent."; String origname "start_region"; String fullnamepath "/ancillary_data/start_region"; } ancillary_data_start_gpsweek { String long_name "Start GPSWeek of Granule (Actual)"; String units "weeks from 1980-01-06"; String source "Derived"; String contentType "auxiliaryInformation"; String description "GPS week number of the first data point in the granule."; String origname "start_gpsweek"; String fullnamepath "/ancillary_data/start_gpsweek"; } gt3r_land_ice_segments_sigma_geo_h { Float32 _FillValue 3.402823466e+38; String long_name "Vertical Geolocation Error"; String units "meters"; String source "ATBD Section 3.10"; String contentType "qualityInformation"; String description "Total vertical geolocation error due to PPD and POD, including the effects of horizontal geolocation error on the segment vertical error."; String origname "sigma_geo_h"; String fullnamepath "/gt3r/land_ice_segments/sigma_geo_h"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_h_li_sigma { Float32 _FillValue 3.402823466e+38; String long_name "Expected RMS segment misfit"; String units "meters"; String source "section 4.4"; String contentType "qualityInformation"; String description "Propagated error due to sampling error and FPB correction from the land ice algorithm"; String origname "h_li_sigma"; String fullnamepath "/gt3r/land_ice_segments/h_li_sigma"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_h_mean { Float32 _FillValue 3.402823466e+38; String long_name "Height Mean"; String units "meters"; String source "ATL06 ATBD"; String contentType "modelResult"; String description "Mean surface height, not corrected for first-photon bias or pulse truncation."; String origname "h_mean"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/h_mean"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_signal_selection_source { String long_name "Signal Selection Source"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 2=Signal selection failed using all flagged ATL03 PE, but succeeded using the backup algorithm; 3=All signal-finding strategies failed."; String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_source"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/signal_selection_source"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_snr { Float32 _FillValue 3.402823466e+38; String long_name "SNR"; String units "1"; String source "section 3.6.2"; String contentType "physicalMeasurement"; String description "Signal-to-noise ratio in the final refined window"; String origname "snr"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/snr"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_h_robust_sprd { Float32 _FillValue 3.402823466e+38; String long_name "Robust Spread"; String units "meters"; String source "section 3.6.3"; String contentType "referenceInformation"; String description "RDE of misfit between PE heights and the along-track segment fit."; String origname "h_robust_sprd"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/h_robust_sprd"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_n_seg_pulses { String units "counts"; Float32 _FillValue 3.402823466e+38; String long_name "Number potential segment pulses"; String source "section 3.3.3"; String contentType "referenceInformation"; String description "The number of pulses potentially included in the segment"; String origname "n_seg_pulses"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/n_seg_pulses"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_dh_fit_dx_sigma { Float32 _FillValue 3.402823466e+38; String long_name "Sigma of Along Track Slope"; String units "meters/meters"; String source "section 3.6.4"; String contentType "qualityInformation"; String description "Propagated error in the along-track segment slope"; String origname "dh_fit_dx_sigma"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/dh_fit_dx_sigma"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_snr_significance { Float32 _FillValue 3.402823466e+38; String long_name "SNR Significance"; String units "1"; String source "section 3.6.2"; String contentType "physicalMeasurement"; String description "Probability that signal-finding routine would converge to at least the observed SNR for a random-noise input. Small values indicate a small likelihood of a surface-detection blunder."; String origname "snr_significance"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/snr_significance"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_h_expected_rms { Float32 _FillValue 3.402823466e+38; String long_name "Expected RMS misfit"; String units "meters"; String source "section 3.6.3"; String contentType "qualityInformation"; String description "Expected RMS misfit between PE heights and along-track segment fit"; String origname "h_expected_rms"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/h_expected_rms"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_dh_fit_dy { Float32 _FillValue 3.402823466e+38; String long_name "Across Track Slope"; String units "meters/meters"; String source "section 3.7"; String contentType "physicalMeasurement"; String description "Across track slope from segment fits to weak and strong beam; the same slope is reported for both laser beams in each pair"; String origname "dh_fit_dy"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/dh_fit_dy"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_sigma_h_mean { Float32 _FillValue 3.402823466e+38; String long_name "Height Error"; String units "meters"; String source "section 3.6.4"; String contentType "qualityInformation"; String description "Propagated height error due to PE-height sampling error for height from the along-track fit, not including geolocation-induced error"; String origname "sigma_h_mean"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/sigma_h_mean"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_h_rms_misfit { Float32 _FillValue 3.402823466e+38; String long_name "RMS Misfit"; String units "meters"; String source "section 3.6.3"; String contentType "qualityInformation"; String description "RMS misfit between PE heights and along- track segment fit"; String origname "h_rms_misfit"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/h_rms_misfit"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_signal_selection_source_status { String long_name "Signal Selection Source Status"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 4; String contentType "qualityInformation"; String description "Indicates the status of the last signal selection algorithm attempted (see signal_selection_source). The definition of flag is different for each source and are defined in each of the signal_selection_status flags. (See Land Ice ATBD Table 3-2)."; String origname "signal_selection_source_status"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/signal_selection_source_status"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_dh_fit_dx { Float32 _FillValue 3.402823466e+38; String long_name "Along Track Slope"; String units "meters/meters"; String source "section 3.3.5.1"; String contentType "physicalMeasurement"; String description "Along-track slope from along-track segment fit"; String origname "dh_fit_dx"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/dh_fit_dx"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_n_fit_photons { Int32 _FillValue 2147483647; String long_name "Number of Photons in Fit"; String units "1"; String source "section 3.3.5.2"; String contentType "physicalMeasurement"; String description "Number of PEs used in determining h_li, after editing"; String origname "n_fit_photons"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/n_fit_photons"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_fit_statistics_w_surface_window_final { Float32 _FillValue 3.402823466e+38; String long_name "Surface Window Width"; String units "meters"; String source "section 3.3.5.2"; String contentType "physicalMeasurement"; String description "Width of the surface window, top to bottom"; String origname "w_surface_window_final"; String fullnamepath "/gt3r/land_ice_segments/fit_statistics/w_surface_window_final"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_longitude { String long_name "Longitude"; String standard_name "longitude"; String units "degrees_east"; String source "section 3.10"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Longitude of segment center, , WGS84, East=+"; String origname "longitude"; String fullnamepath "/gt3r/land_ice_segments/longitude"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude"; } gt3r_land_ice_segments_latitude { String long_name "Latitude"; String standard_name "latitude"; String units "degrees_north"; String source "section 3.10"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Latitude of segment center, WGS84, North=+,"; String origname "latitude"; String fullnamepath "/gt3r/land_ice_segments/latitude"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_h_li { Float32 _FillValue 3.402823466e+38; String long_name "Land Ice height"; String units "meters"; String source "section 4.4"; String contentType "physicalMeasurement"; String description "Standard land-ice segment height determined by land ice algorithm, corrected for first-photon bias, representing the median- based height of the selected PEs"; String origname "h_li"; String fullnamepath "/gt3r/land_ice_segments/h_li"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_ground_track_ref_azimuth { String units "radians"; Float32 _FillValue 3.402823466e+38; String long_name "Azimuth"; String source "ATL03g, Section 3.3"; String contentType "referenceInformation"; String description "The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft)."; String origname "ref_azimuth"; String fullnamepath "/gt3r/land_ice_segments/ground_track/ref_azimuth"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_ground_track_seg_azimuth { Float32 _FillValue 3.402823466e+38; String long_name "Segment Azimuth"; String units "degrees"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "Azimuth of the pair-track, east of local north."; String origname "seg_azimuth"; String fullnamepath "/gt3r/land_ice_segments/ground_track/seg_azimuth"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_ground_track_sigma_geo_at { Float32 _FillValue 3.402823466e+38; String long_name "Along Track Geolocation Error"; String units "meters"; String source "section 3.10"; String contentType "qualityInformation"; String description "Along-track component of the geolocation error."; String origname "sigma_geo_at"; String fullnamepath "/gt3r/land_ice_segments/ground_track/sigma_geo_at"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_ground_track_sigma_geo_r { Float32 _FillValue 3.402823466e+38; String long_name "Radial Orbit Error"; String units "meters"; String source "ATBD Section 3.10, (ATL03 sigma_h)"; String contentType "qualityInformation"; String description "Radial orbit component of the geolocation error."; String origname "sigma_geo_r"; String fullnamepath "/gt3r/land_ice_segments/ground_track/sigma_geo_r"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_ground_track_ref_coelv { Float32 _FillValue 3.402823466e+38; String long_name "Co-elevation"; String units "radians"; String source "ATL03g, Section 3.3"; String contentType "referenceInformation"; String description "Coelevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot."; String origname "ref_coelv"; String fullnamepath "/gt3r/land_ice_segments/ground_track/ref_coelv"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_ground_track_sigma_geo_xt { Float32 _FillValue 3.402823466e+38; String long_name "Across Track Geolocation Error"; String units "meters"; String source "section 3.10"; String contentType "qualityInformation"; String description "Across-track component of the geolocation error."; String origname "sigma_geo_xt"; String fullnamepath "/gt3r/land_ice_segments/ground_track/sigma_geo_xt"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_ground_track_x_atc { Float64 _FillValue 1.7976931348623157e+308; String long_name "X Along Track"; String units "meters"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "The along-track x-coordinate of the segment, measured parallel to the RGT, measured from the ascending node of the equatorial crossing of a given RGT."; String origname "x_atc"; String fullnamepath "/gt3r/land_ice_segments/ground_track/x_atc"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_ground_track_y_atc { Float32 _FillValue 3.402823466e+38; String long_name "Y Along Track"; String units "meters"; String source "section 3.1.2.2"; String contentType "referenceInformation"; String description "Along-track y coordinate of the segment, relative to the RGT, measured along the perpendicular to the RGT, positive to the right of the RGT."; String origname "y_atc"; String fullnamepath "/gt3r/land_ice_segments/ground_track/y_atc"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_dem_dem_flag { String long_name "DEM Source Flag"; String units "1"; String source "ATL03"; Int16 valid_min 0; Int16 valid_max 4; String contentType "referenceInformation"; String description "Indicates source of the DEM height. Values: 0=None, 1=Arctic, 2=Global, 3=MSS, 4=Antarctic."; String flag_meanings "none arctic global mss antarctic"; Int16 flag_values 0, 1, 2, 3, 4; String origname "dem_flag"; String fullnamepath "/gt3r/land_ice_segments/dem/dem_flag"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_dem_geoid_free2mean { Float32 _FillValue 3.402823466e+38; String long_name "Geoid Free-to-Mean conversion"; String units "meters"; String source "ATL03"; String contentType "modelResult"; String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system. (Add to geoid to get the geoid heights in the mean-tide system.)"; String origname "geoid_free2mean"; String fullnamepath "/gt3r/land_ice_segments/dem/geoid_free2mean"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_dem_dem_h { Float32 _FillValue 3.402823466e+38; String long_name "DEM Height"; String units "meters"; String source "ATL06 ATBD"; String contentType "referenceInformation"; String description "Height of the DEM, interpolated by cubic-spline interpolation in the DEM coordinate system to the PE location. (Best available DEM value in priority of Arctic/Antarctic/Global/MSS)"; String origname "dem_h"; String fullnamepath "/gt3r/land_ice_segments/dem/dem_h"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_dem_geoid_h { Float32 _FillValue 3.402823466e+38; String long_name "Geoid Height"; String units "meters"; String source "EGM2008"; String contentType "referenceInformation"; String description "Geoid height above WGS-84 reference ellipsoid (range -107 to 86m) in the tide-free system."; String origname "geoid_h"; String fullnamepath "/gt3r/land_ice_segments/dem/geoid_h"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_msw_flag { Int16 _FillValue 127; String long_name "Multiple Scattering Warning Flag"; String units "1"; String source "ATL09"; Int16 valid_min -1; Int16 valid_max 5; String contentType "referenceInformation"; String description "Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight."; String flag_meanings "cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5"; Int16 flag_values -1, 0, 1, 2, 3, 4, 5; String origname "msw_flag"; String fullnamepath "/gt3r/land_ice_segments/geophysical/msw_flag"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_layer_flag { String units "1"; String source "ATL09"; Int16 _FillValue 127; String long_name "Consolidated cloud flag"; Int16 valid_min 0; Int16 valid_max 1; String contentType "referenceInformation"; String description "This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow."; String flag_meanings "likely_clear likely_cloudy"; Int16 flag_values 0, 1; String origname "layer_flag"; String fullnamepath "/gt3r/land_ice_segments/geophysical/layer_flag"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_bsnow_conf { Int16 _FillValue 127; String long_name "Blowing Snow confidence"; String units "1"; String source "ATL09"; String contentType "referenceInformation"; String description "Confidence flag for presence of blowing snow"; String origname "bsnow_conf"; String fullnamepath "/gt3r/land_ice_segments/geophysical/bsnow_conf"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_bsnow_h { Float32 _FillValue 3.402823466e+38; String long_name "Blowing Snow Layer Top Height"; String units "meters"; String source "ATL09"; String contentType "referenceInformation"; String description "Blowing snow layer top height"; String origname "bsnow_h"; String fullnamepath "/gt3r/land_ice_segments/geophysical/bsnow_h"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_tide_ocean { Float32 _FillValue 3.402823466e+38; String long_name "Ocean Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.1"; String contentType "referenceInformation"; String description "Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium)."; String origname "tide_ocean"; String fullnamepath "/gt3r/land_ice_segments/geophysical/tide_ocean"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_tide_earth { Float32 _FillValue 3.402823466e+38; String long_name "Earth Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.3"; String contentType "referenceInformation"; String description "Solid earth tides in the tide-free system."; String origname "tide_earth"; String fullnamepath "/gt3r/land_ice_segments/geophysical/tide_earth"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_solar_azimuth { Float32 _FillValue 3.402823466e+38; String long_name "solar azimuth"; String units "degrees_east"; String source "ATL03"; String contentType "referenceInformation"; String description "The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot."; String origname "solar_azimuth"; String fullnamepath "/gt3r/land_ice_segments/geophysical/solar_azimuth"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_r_eff { Float32 _FillValue 3.402823466e+38; String long_name "Effective uncorrected reflectance"; String units "1"; String source "section 3.1.5.4"; String contentType "referenceInformation"; String description "Effective reflectance, uncorrected for atmospheric effects."; String origname "r_eff"; String fullnamepath "/gt3r/land_ice_segments/geophysical/r_eff"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_dac { Float32 _FillValue 3.402823466e+38; String long_name "Dynamic Atmosphere Correction"; String units "meters"; String source "ATL03, 6.3.2"; String contentType "referenceInformation"; String description "Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect."; String origname "dac"; String fullnamepath "/gt3r/land_ice_segments/geophysical/dac"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_tide_load { Float32 _FillValue 3.402823466e+38; String long_name "Load Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.4"; String contentType "referenceInformation"; String description "Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm)."; String origname "tide_load"; String fullnamepath "/gt3r/land_ice_segments/geophysical/tide_load"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_tide_earth_free2mean { Float32 _FillValue 3.402823466e+38; String long_name "Earth Tide Free-to-Mean conversion"; String units "meters"; String source "ATL03"; String contentType "referenceInformation"; String description "Additive value to convert solid earth tide from the tide-free system to the mean tide system. (Add to tide_earth to get solid earth tides in the mean-tide system.)"; String origname "tide_earth_free2mean"; String fullnamepath "/gt3r/land_ice_segments/geophysical/tide_earth_free2mean"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_bsnow_od { Float32 _FillValue 3.402823466e+38; String long_name "Blowing snow OD"; String units "1"; String source "ATL09"; String contentType "modelResult"; String description "Optical thickness of blowing snow layer."; String origname "bsnow_od"; String fullnamepath "/gt3r/land_ice_segments/geophysical/bsnow_od"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_tide_equilibrium { Float32 _FillValue 3.402823466e+38; String long_name "Equilibrium Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.1"; String contentType "referenceInformation"; String description "Long period equilibrium tide self-consistent with the ocean tide model (+-0.04m)."; String origname "tide_equilibrium"; String fullnamepath "/gt3r/land_ice_segments/geophysical/tide_equilibrium"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_cloud_flg_atm { Int16 _FillValue 127; String long_name "Cloud Flag ATM"; String units "1"; String source "ATL09"; Int16 valid_min 0; Int16 valid_max 10; String contentType "referenceInformation"; String description "Number of layers found from the backscatter profile using the DDA layer finder."; String origname "cloud_flg_atm"; String fullnamepath "/gt3r/land_ice_segments/geophysical/cloud_flg_atm"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_solar_elevation { Float32 _FillValue 3.402823466e+38; String long_name "solar elevation"; String units "degrees"; String source "ATL03"; Float32 valid_min -90.00000000; Float32 valid_max 90.00000000; String contentType "referenceInformation"; String description "Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low-precision value, with approximately TBD degree accuracy."; String origname "solar_elevation"; String fullnamepath "/gt3r/land_ice_segments/geophysical/solar_elevation"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_tide_pole { Float32 _FillValue 3.402823466e+38; String long_name "Solid Earth Pole Tide"; String units "meters"; String source "ATL03 ATBD, Section 6.3.5"; String contentType "referenceInformation"; String description "Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm)."; String origname "tide_pole"; String fullnamepath "/gt3r/land_ice_segments/geophysical/tide_pole"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_e_bckgrd { Float32 _FillValue 3.402823466e+38; String long_name "Expected background count rate"; String units "hz"; String source "section 3.6.1"; String contentType "referenceInformation"; String description "Expected background count rate based on sun angle, surface slope, for unit surface reflectance"; String origname "e_bckgrd"; String fullnamepath "/gt3r/land_ice_segments/geophysical/e_bckgrd"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_cloud_flg_asr { Int16 _FillValue 127; String long_name "Cloud Flag ASR"; String units "1"; String source "ATL09"; Int16 valid_min 0; Int16 valid_max 5; String contentType "referenceInformation"; String description "Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence"; String flag_meanings "clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence"; Int16 flag_values 0, 1, 2, 3, 4, 5; String origname "cloud_flg_asr"; String fullnamepath "/gt3r/land_ice_segments/geophysical/cloud_flg_asr"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_bckgrd { Float32 _FillValue 3.402823466e+38; String long_name "Background count rate"; String units "hz"; String source "section 3.6.1"; String contentType "referenceInformation"; String description "Background count rate, derived from the ATL03 50-shot-average, interpolated to the segment center."; String origname "bckgrd"; String fullnamepath "/gt3r/land_ice_segments/geophysical/bckgrd"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_geophysical_neutat_delay_total { Float32 _FillValue 3.402823466e+38; String long_name "Total Neutral Atmospheric Delay"; String units "meters"; String source "ATL03a ATBD"; String contentType "referenceInformation"; String description "Total neutral atmosphere delay correction (wet+dry)."; String origname "neutat_delay_total"; String fullnamepath "/gt3r/land_ice_segments/geophysical/neutat_delay_total"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_atl06_quality_summary { String long_name "ATL06_Quality_Summary"; String units "1"; String source "section 4.3"; Int16 valid_min 0; Int16 valid_max 1; String contentType "qualityInformation"; String description "The ATL06_quality_summary parameter indicates the best-quality subset of all ATL06 data. A zero in this parameter implies that no data-quality tests have found a problem with the segment, a one implies that some potential problem has been found. Users who select only segments with zero values for this flag can be relatively certain of obtaining high-quality data, but will likely miss a significant fraction of usable data, particularly in cloudy, rough, or low-surface-reflectance conditions."; String flag_meanings "best_quality potential_problem"; Int16 flag_values 0, 1; String origname "atl06_quality_summary"; String fullnamepath "/gt3r/land_ice_segments/atl06_quality_summary"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_segment_id { Int32 _FillValue 0; String long_name "Reference Point, m"; String units "1"; String source "section 3.1.2.1"; String contentType "referenceInformation"; String description "Segment number, counting from the equator. Equal to the segment_id for the second of the two 20m ATL03 segments included in the 40m ATL06 segment"; String origname "segment_id"; String fullnamepath "/gt3r/land_ice_segments/segment_id"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_bias_correction_fpb_mean_corr { Float32 _FillValue 3.402823466e+38; String long_name "first photon bias mean correction"; String units "meters"; String source "section 3.4.3.1"; String contentType "qualityInformation"; String description "Estimated first-photon bias (fpb) correction to mean segment height"; String origname "fpb_mean_corr"; String fullnamepath "/gt3r/land_ice_segments/bias_correction/fpb_mean_corr"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_bias_correction_fpb_mean_corr_sigma { String units "meters"; Float32 _FillValue 3.402823466e+38; String long_name "fpb mean corr sigma"; String source "section 3.4.3.1"; String contentType "qualityInformation"; String description "Estimated error in fpb_mean_corr"; String origname "fpb_mean_corr_sigma"; String fullnamepath "/gt3r/land_ice_segments/bias_correction/fpb_mean_corr_sigma"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_bias_correction_fpb_med_corr { Float32 _FillValue 3.402823466e+38; String long_name "fpb median corr"; String units "meters"; String source "section 3.4.3.2"; String contentType "qualityInformation"; String description "First-photon-bias correction giving the difference between the mean segment height and the corrected median height"; String origname "fpb_med_corr"; String fullnamepath "/gt3r/land_ice_segments/bias_correction/fpb_med_corr"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_bias_correction_fpb_med_corr_sigma { Float32 _FillValue 3.402823466e+38; String long_name "fpb median corr sigma"; String units "meters"; String source "section 3.4.3.2"; String contentType "qualityInformation"; String description "Estimated error in fpb_med_corr"; String origname "fpb_med_corr_sigma"; String fullnamepath "/gt3r/land_ice_segments/bias_correction/fpb_med_corr_sigma"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_bias_correction_fpb_n_corr { Float32 _FillValue 3.402823466e+38; String long_name "fpb number photons corr"; String units "counts"; String source "section 4.3.3.3"; String contentType "qualityInformation"; String description "Estimated window photon count after first-photon-bias correction"; String origname "fpb_n_corr"; String fullnamepath "/gt3r/land_ice_segments/bias_correction/fpb_n_corr"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_bias_correction_tx_mean_corr { Float32 _FillValue 3.402823466e+38; String long_name "tx shape mean correction"; String units "meters"; String source "section 3.5"; String contentType "qualityInformation"; String description "Estimate of the difference between the mean of the full-waveform transmit-pulse and the mean of a broadened, truncated waveform consistent with the received pulse"; String origname "tx_mean_corr"; String fullnamepath "/gt3r/land_ice_segments/bias_correction/tx_mean_corr"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_bias_correction_med_r_fit { Float32 _FillValue 3.402823466e+38; String long_name "mean median residual"; String units "meters"; String source "section 3.3.5"; String contentType "qualityInformation"; String description "Difference between uncorrected mean and median of linear fit residuals"; String origname "med_r_fit"; String fullnamepath "/gt3r/land_ice_segments/bias_correction/med_r_fit"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_land_ice_segments_bias_correction_tx_med_corr { Float32 _FillValue 3.402823466e+38; String long_name "tx shape median correction"; String units "meters"; String source "section 3.5"; String contentType "qualityInformation"; String description "Estimate of the difference between the median of the full-waveform transmit-pulse mean and the median of a broadened, truncated waveform consistent with the received pulse"; String origname "tx_med_corr"; String fullnamepath "/gt3r/land_ice_segments/bias_correction/tx_med_corr"; String coordinates "gt3r_land_ice_segments_delta_time gt3r_land_ice_segments_latitude gt3r_land_ice_segments_longitude"; } gt3r_residual_histogram_count { Int32 _FillValue 2147483647; String long_name "Bin Counts"; String units "counts"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Residual count falling with each histogram bin. The top height of each histogram bin may be found in the bin_top_h dataset."; String origname "count"; String fullnamepath "/gt3r/residual_histogram/count"; String coordinates "gt3r_residual_histogram_delta_time gt3r_residual_histogram_lat_mean gt3r_residual_histogram_lon_mean"; } gt3r_residual_histogram_lat_mean { String long_name "Latitude Mean"; String standard_name "latitude"; String units "degrees_north"; String source "Section 4.11"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "physicalMeasurement"; String description "Mean latitude of the segments included in the histogram"; String origname "lat_mean"; String fullnamepath "/gt3r/residual_histogram/lat_mean"; String coordinates "gt3r_residual_histogram_delta_time gt3r_residual_histogram_lon_mean"; } gt3r_residual_histogram_x_atc_mean { String long_name "Along Track Coordinate Mean"; String units "1"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Mean along-track coordinate of the segments included in the histogram."; String origname "x_atc_mean"; String fullnamepath "/gt3r/residual_histogram/x_atc_mean"; String coordinates "gt3r_residual_histogram_delta_time gt3r_residual_histogram_lat_mean gt3r_residual_histogram_lon_mean"; } gt3r_residual_histogram_segment_id_list { String long_name "Segment ID List"; String units "1"; String source "Section 4.11"; String contentType "referenceInformation"; String description "Segments ids included in each column of the histogram"; Int32 _FillValue 2147483647; String origname "segment_id_list"; String fullnamepath "/gt3r/residual_histogram/segment_id_list"; String coordinates "gt3r_residual_histogram_delta_time gt3r_residual_histogram_lat_mean gt3r_residual_histogram_lon_mean"; } gt3r_residual_histogram_bckgrd_per_m { String long_name "Expected background PEs"; String units "1"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Number of background PE expected for each vertical meter of the histogram based on the observed background rate (bckgrd)."; String origname "bckgrd_per_m"; String fullnamepath "/gt3r/residual_histogram/bckgrd_per_m"; String coordinates "gt3r_residual_histogram_delta_time gt3r_residual_histogram_lat_mean gt3r_residual_histogram_lon_mean"; } gt3r_residual_histogram_pulse_count { String long_name "Number of Histogram Segment Pulses"; String units "counts"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Number of pulses potentially included in the histogram (pulses are counted if they are in the central 20 m of each segment, even if no PE from the pulse are selected)."; String origname "pulse_count"; String fullnamepath "/gt3r/residual_histogram/pulse_count"; String coordinates "gt3r_residual_histogram_delta_time gt3r_residual_histogram_lat_mean gt3r_residual_histogram_lon_mean"; } gt3r_residual_histogram_lon_mean { String long_name "Longitude Mean"; String standard_name "longitude"; String units "degrees_east"; String source "Section 4.11"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "physicalMeasurement"; String description "Mean longitude of the segments included in the histogram"; String origname "lon_mean"; String fullnamepath "/gt3r/residual_histogram/lon_mean"; String coordinates "gt3r_residual_histogram_delta_time gt3r_residual_histogram_lat_mean"; } gt3r_segment_quality_record_number { String long_name "Land Ice Height Index"; String units "1"; String source "section 4.2"; String contentType "referenceInformation"; String description "For those segments that have adequate signal strength, this parameter gives the record for the pair within the other groups in the granule."; String origname "record_number"; String fullnamepath "/gt3r/segment_quality/record_number"; String coordinates "gt3r_segment_quality_delta_time gt3r_segment_quality_reference_pt_lat gt3r_segment_quality_reference_pt_lon"; } gt3r_segment_quality_reference_pt_lat { String long_name "Latitude"; String units "degrees_north"; String source "section 3.1.9"; Float64 valid_min -90.000000000000000; Float64 valid_max 90.000000000000000; String contentType "referenceInformation"; String description "Latitude of the reference segment location on the RPT"; String standard_name "latitude"; String origname "reference_pt_lat"; String fullnamepath "/gt3r/segment_quality/reference_pt_lat"; String coordinates "gt3r_segment_quality_delta_time gt3r_segment_quality_reference_pt_lon"; } gt3r_segment_quality_reference_pt_lon { String long_name "Longitude"; String units "degrees_east"; String source "section 3.1.9"; Float64 valid_min -180.00000000000000; Float64 valid_max 180.00000000000000; String contentType "referenceInformation"; String description "Longitude of the reference segment location on the RPT"; String standard_name "longitude"; String origname "reference_pt_lon"; String fullnamepath "/gt3r/segment_quality/reference_pt_lon"; String coordinates "gt3r_segment_quality_delta_time gt3r_segment_quality_reference_pt_lat"; } gt3r_segment_quality_segment_id { String long_name "Reference Point, m"; String units "1"; String source "section 3.1.2.1"; String contentType "referenceInformation"; String description "Segment number corresponding to the second of two ATL03 segments in the ATL06 segment, counted from the RGT equator crossing"; String origname "segment_id"; String fullnamepath "/gt3r/segment_quality/segment_id"; String coordinates "gt3r_segment_quality_delta_time gt3r_segment_quality_reference_pt_lat gt3r_segment_quality_reference_pt_lon"; } gt3r_segment_quality_signal_selection_source { String long_name "Signal Selection Source"; String units "1"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates the last algorithm attempted to select the signal for ATL06 fitting. 0=Signal selection succeeded using ATL03 detected PE; 1=Signal selection failed using ATL03 detected PE but succeeded using all flagged ATL03 PE; 2=Signal selection failed using all flagged ATL03 PE, but succeeded using the backup algorithm; 3=All signal-finding strategies failed."; String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_source"; String fullnamepath "/gt3r/segment_quality/signal_selection_source"; String coordinates "gt3r_segment_quality_delta_time gt3r_segment_quality_reference_pt_lat gt3r_segment_quality_reference_pt_lon"; } gt3r_segment_quality_signal_selection_status_signal_selection_status_all { String units "1"; String long_name "Signal Selection Status Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using all ATL03-flagged PEs. 0=Signal selection succeeded using all ATL03-flagged PEs (or algorithm not attempted); 1=Signal selection using all ATL03-flagged PEs failed the 20-meter-spread test; 2=Signal selection using all ATL03-flagged PEs failed the 10-photon-count test; 3=Signal selection using all ATL03-flagged PEs failed both tests"; String flag_meanings "succeeded failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_status_all"; String fullnamepath "/gt3r/segment_quality/signal_selection_status/signal_selection_status_all"; String coordinates "gt3r_segment_quality_delta_time gt3r_segment_quality_reference_pt_lat gt3r_segment_quality_reference_pt_lon"; } gt3r_segment_quality_signal_selection_status_signal_selection_status_backup { String units "1"; String long_name "Signal Selection Backup Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 4; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using the backup signal finder. 0=Signal selection succeeded using the backup signal finder after centering the window on flagged PE (or backup signal finder not attempted); 1=Signal selection succeeded using the backup signal finder after searching for the strongest-signal window using four adjacent ATL03 segments; 2=Signal selection using the backup signal finder failed the 20-meter spread test; 3=Signal selection using the backup signal finder failed the 10-photon count test; 4=Signal selection using the backup signal finder failed both tests"; String flag_meanings "succeeded failed_widen failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3, 4; String origname "signal_selection_status_backup"; String fullnamepath "/gt3r/segment_quality/signal_selection_status/signal_selection_status_backup"; String coordinates "gt3r_segment_quality_delta_time gt3r_segment_quality_reference_pt_lat gt3r_segment_quality_reference_pt_lon"; } gt3r_segment_quality_signal_selection_status_signal_selection_status_confident { String units "1"; String long_name "Signal Selection Confident Flag"; String source "section 3.3.3"; Int16 valid_min 0; Int16 valid_max 3; String contentType "qualityInformation"; String description "Indicates confidence of the signal-selection algorithm using low or better PEs. 0=Signal selection succeeded using ATL03 low-or-better confidence PEs; 1=Signal selection using ATL03 low-or-better confidence PEs failed the 20-meter-spread test; 2=Signal selection using ATL03 low-or-better confidence PEs failed the 10-photon-count test; 3=Signal selection using ATL03 low-or-better confidence PEs failed both tests"; String flag_meanings "succeeded failed_20 failed_10 failed_both"; Int16 flag_values 0, 1, 2, 3; String origname "signal_selection_status_confident"; String fullnamepath "/gt3r/segment_quality/signal_selection_status/signal_selection_status_confident"; String coordinates "gt3r_segment_quality_delta_time gt3r_segment_quality_reference_pt_lat gt3r_segment_quality_reference_pt_lon"; } gt1l_land_ice_segments_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "section 4.4"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "latitude longitude"; String origname "delta_time"; String fullnamepath "/gt1l/land_ice_segments/delta_time"; } gt1l_residual_histogram_bin_top_h { String long_name "Bin Top Height"; String units "meters"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Height of the top of each histogram bin, listed in increasing order. The bottom of each bin is equal to the top of the next- lowest bin."; String coordinates "delta_time lat_mean lon_mean"; String origname "bin_top_h"; String fullnamepath "/gt1l/residual_histogram/bin_top_h"; } gt1l_residual_histogram_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "section 4.4"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "lat_mean lon_mean"; String origname "delta_time"; String fullnamepath "/gt1l/residual_histogram/delta_time"; } gt1l_residual_histogram_ds_segment_id { String long_name "Segment ID Index"; String units "1"; String source "Section 4.11"; Int16 valid_min 1; Int16 valid_max 10; String contentType "auxiliaryInformation"; String description "Relative index of each segment_id used in the derivation of the histogram."; String origname "ds_segment_id"; String fullnamepath "/gt1l/residual_histogram/ds_segment_id"; } gt1l_segment_quality_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "ATL03"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "reference_pt_lat reference_pt_lon"; String origname "delta_time"; String fullnamepath "/gt1l/segment_quality/delta_time"; } gt1r_land_ice_segments_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "section 4.4"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "latitude longitude"; String origname "delta_time"; String fullnamepath "/gt1r/land_ice_segments/delta_time"; } gt1r_residual_histogram_bin_top_h { String long_name "Bin Top Height"; String units "meters"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Height of the top of each histogram bin, listed in increasing order. The bottom of each bin is equal to the top of the next- lowest bin."; String coordinates "delta_time lat_mean lon_mean"; String origname "bin_top_h"; String fullnamepath "/gt1r/residual_histogram/bin_top_h"; } gt1r_residual_histogram_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "section 4.4"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "lat_mean lon_mean"; String origname "delta_time"; String fullnamepath "/gt1r/residual_histogram/delta_time"; } gt1r_residual_histogram_ds_segment_id { String long_name "Segment ID Index"; String units "1"; String source "Section 4.11"; Int16 valid_min 1; Int16 valid_max 10; String contentType "auxiliaryInformation"; String description "Relative index of each segment_id used in the derivation of the histogram."; String origname "ds_segment_id"; String fullnamepath "/gt1r/residual_histogram/ds_segment_id"; } gt1r_segment_quality_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "ATL03"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "reference_pt_lat reference_pt_lon"; String origname "delta_time"; String fullnamepath "/gt1r/segment_quality/delta_time"; } gt2l_land_ice_segments_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "section 4.4"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "latitude longitude"; String origname "delta_time"; String fullnamepath "/gt2l/land_ice_segments/delta_time"; } gt2l_residual_histogram_bin_top_h { String long_name "Bin Top Height"; String units "meters"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Height of the top of each histogram bin, listed in increasing order. The bottom of each bin is equal to the top of the next- lowest bin."; String coordinates "delta_time lat_mean lon_mean"; String origname "bin_top_h"; String fullnamepath "/gt2l/residual_histogram/bin_top_h"; } gt2l_residual_histogram_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "section 4.4"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "lat_mean lon_mean"; String origname "delta_time"; String fullnamepath "/gt2l/residual_histogram/delta_time"; } gt2l_residual_histogram_ds_segment_id { String long_name "Segment ID Index"; String units "1"; String source "Section 4.11"; Int16 valid_min 1; Int16 valid_max 10; String contentType "auxiliaryInformation"; String description "Relative index of each segment_id used in the derivation of the histogram."; String origname "ds_segment_id"; String fullnamepath "/gt2l/residual_histogram/ds_segment_id"; } gt2l_segment_quality_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "ATL03"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "reference_pt_lat reference_pt_lon"; String origname "delta_time"; String fullnamepath "/gt2l/segment_quality/delta_time"; } gt2r_land_ice_segments_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "section 4.4"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "latitude longitude"; String origname "delta_time"; String fullnamepath "/gt2r/land_ice_segments/delta_time"; } gt2r_residual_histogram_bin_top_h { String long_name "Bin Top Height"; String units "meters"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Height of the top of each histogram bin, listed in increasing order. The bottom of each bin is equal to the top of the next- lowest bin."; String coordinates "delta_time lat_mean lon_mean"; String origname "bin_top_h"; String fullnamepath "/gt2r/residual_histogram/bin_top_h"; } gt2r_residual_histogram_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "section 4.4"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "lat_mean lon_mean"; String origname "delta_time"; String fullnamepath "/gt2r/residual_histogram/delta_time"; } gt2r_residual_histogram_ds_segment_id { String long_name "Segment ID Index"; String units "1"; String source "Section 4.11"; Int16 valid_min 1; Int16 valid_max 10; String contentType "auxiliaryInformation"; String description "Relative index of each segment_id used in the derivation of the histogram."; String origname "ds_segment_id"; String fullnamepath "/gt2r/residual_histogram/ds_segment_id"; } gt2r_segment_quality_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "ATL03"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "reference_pt_lat reference_pt_lon"; String origname "delta_time"; String fullnamepath "/gt2r/segment_quality/delta_time"; } gt3l_land_ice_segments_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "section 4.4"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "latitude longitude"; String origname "delta_time"; String fullnamepath "/gt3l/land_ice_segments/delta_time"; } gt3l_residual_histogram_bin_top_h { String long_name "Bin Top Height"; String units "meters"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Height of the top of each histogram bin, listed in increasing order. The bottom of each bin is equal to the top of the next- lowest bin."; String coordinates "delta_time lat_mean lon_mean"; String origname "bin_top_h"; String fullnamepath "/gt3l/residual_histogram/bin_top_h"; } gt3l_residual_histogram_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "section 4.4"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "lat_mean lon_mean"; String origname "delta_time"; String fullnamepath "/gt3l/residual_histogram/delta_time"; } gt3l_residual_histogram_ds_segment_id { String long_name "Segment ID Index"; String units "1"; String source "Section 4.11"; Int16 valid_min 1; Int16 valid_max 10; String contentType "auxiliaryInformation"; String description "Relative index of each segment_id used in the derivation of the histogram."; String origname "ds_segment_id"; String fullnamepath "/gt3l/residual_histogram/ds_segment_id"; } gt3l_segment_quality_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "ATL03"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "reference_pt_lat reference_pt_lon"; String origname "delta_time"; String fullnamepath "/gt3l/segment_quality/delta_time"; } gt3r_land_ice_segments_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "section 4.4"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "latitude longitude"; String origname "delta_time"; String fullnamepath "/gt3r/land_ice_segments/delta_time"; } gt3r_residual_histogram_bin_top_h { String long_name "Bin Top Height"; String units "meters"; String source "Section 4.11"; String contentType "physicalMeasurement"; String description "Height of the top of each histogram bin, listed in increasing order. The bottom of each bin is equal to the top of the next- lowest bin."; String coordinates "delta_time lat_mean lon_mean"; String origname "bin_top_h"; String fullnamepath "/gt3r/residual_histogram/bin_top_h"; } gt3r_residual_histogram_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "section 4.4"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "lat_mean lon_mean"; String origname "delta_time"; String fullnamepath "/gt3r/residual_histogram/delta_time"; } gt3r_residual_histogram_ds_segment_id { String long_name "Segment ID Index"; String units "1"; String source "Section 4.11"; Int16 valid_min 1; Int16 valid_max 10; String contentType "auxiliaryInformation"; String description "Relative index of each segment_id used in the derivation of the histogram."; String origname "ds_segment_id"; String fullnamepath "/gt3r/residual_histogram/ds_segment_id"; } gt3r_segment_quality_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "ATL03"; String contentType "referenceInformation"; String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "reference_pt_lat reference_pt_lon"; String origname "delta_time"; String fullnamepath "/gt3r/segment_quality/delta_time"; } orbit_info_crossing_time { String long_name "Ascending Node Crossing Time"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "POD/PPD"; String contentType "referenceInformation"; String description "The time, in seconds since the ATLAS SDP GPS Epoch, at which the ascending node crosses the equator. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String origname "crossing_time"; String fullnamepath "/orbit_info/crossing_time"; } orbit_info_sc_orient_time { String long_name "Time of Last Spacecraft Orientation Change"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "POD/PPD"; String contentType "referenceInformation"; String description "The time of the last spacecraft orientation change between forward, backward and transitional flight modes, expressed in seconds since the ATLAS SDP GPS Epoch. ICESat-2 is considered to be flying forward when the weak beams are leading the strong beams; and backward when the strong beams are leading the weak beams. ICESat-2 is considered to be in transition while it is maneuvering between the two orientations. Science quality is potentially degraded while in transition mode. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String origname "sc_orient_time"; String fullnamepath "/orbit_info/sc_orient_time"; } quality_assessment_gt1l_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "ATL03"; String contentType "referenceInformation"; String description "Mean number of GPS seconds since the ATLAS SDP epoch for the 10km segment. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "lat_mean lon_mean"; String origname "delta_time"; String fullnamepath "/quality_assessment/gt1l/delta_time"; } quality_assessment_gt1r_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "ATL03"; String contentType "referenceInformation"; String description "Mean number of GPS seconds since the ATLAS SDP epoch for the 10km segment. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "lat_mean lon_mean"; String origname "delta_time"; String fullnamepath "/quality_assessment/gt1r/delta_time"; } quality_assessment_gt2l_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "ATL03"; String contentType "referenceInformation"; String description "Mean number of GPS seconds since the ATLAS SDP epoch for the 10km segment. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "lat_mean lon_mean"; String origname "delta_time"; String fullnamepath "/quality_assessment/gt2l/delta_time"; } quality_assessment_gt2r_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "ATL03"; String contentType "referenceInformation"; String description "Mean number of GPS seconds since the ATLAS SDP epoch for the 10km segment. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "lat_mean lon_mean"; String origname "delta_time"; String fullnamepath "/quality_assessment/gt2r/delta_time"; } quality_assessment_gt3l_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "ATL03"; String contentType "referenceInformation"; String description "Mean number of GPS seconds since the ATLAS SDP epoch for the 10km segment. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "lat_mean lon_mean"; String origname "delta_time"; String fullnamepath "/quality_assessment/gt3l/delta_time"; } quality_assessment_gt3r_delta_time { String long_name "Elapsed GPS seconds"; String standard_name "time"; String units "seconds since 2018-01-01"; String source "ATL03"; String contentType "referenceInformation"; String description "Mean number of GPS seconds since the ATLAS SDP epoch for the 10km segment. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed."; String coordinates "lat_mean lon_mean"; String origname "delta_time"; String fullnamepath "/quality_assessment/gt3r/delta_time"; } FakeDim0 { String units "level"; } FakeDim1 { String units "level"; } DODS_EXTRA { String Unlimited_Dimension "gt1l_land_ice_segments_delta_time", "gt1l_residual_histogram_delta_time", "gt1l_segment_quality_delta_time", "gt1r_land_ice_segments_delta_time", "gt1r_residual_histogram_delta_time", "gt1r_segment_quality_delta_time", "gt2l_land_ice_segments_delta_time", "gt2l_residual_histogram_delta_time", "gt2l_segment_quality_delta_time", "gt2r_land_ice_segments_delta_time", "gt2r_residual_histogram_delta_time", "gt2r_segment_quality_delta_time", "gt3l_land_ice_segments_delta_time", "gt3l_residual_histogram_delta_time", "gt3l_segment_quality_delta_time", "gt3r_land_ice_segments_delta_time", "gt3r_residual_histogram_delta_time", "gt3r_segment_quality_delta_time", "orbit_info_crossing_time", "orbit_info_sc_orient_time", "quality_assessment_gt1l_delta_time", "quality_assessment_gt1r_delta_time", "quality_assessment_gt2l_delta_time", "quality_assessment_gt2r_delta_time", "quality_assessment_gt3l_delta_time", "quality_assessment_gt3r_delta_time"; } }