Attributes {
HDF5_GLOBAL {
String granule_type "ATL06";
String short_name "ATL06";
String level "3A";
String description "Land ice surface heights for each beam, along and across-track slopes calculated for beam pairs. All parameters are calculated for the same along-track increments for each beam and repeat.";
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 Conventions "CF-1.6";
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 identifier_product_doi "10.5067/ATLAS/ATL06.001";
String identifier_product_doi_authority "http://dx.doi.org";
String identifier_product_type "ATL06";
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 "2019-07-01T20:44:17.000000Z";
String hdfversion "HDF5 1.10.3";
String history "2019-07-01T20:44:17.000000Z;b8766250-e786-3c05-9e4f-2315bf80a2e7;Created by PGE atlas_l3a_is 4.1";
String identifier_file_uuid "b8766250-e786-3c05-9e4f-2315bf80a2e7";
String identifier_product_format_version "4.1";
Float64 time_coverage_duration 510.00000000000000;
String time_coverage_end "2019-04-19T05:13:39.000000Z";
String time_coverage_start "2019-04-19T05:05:09.000000Z";
Float64 geospatial_lat_min 42.801056260088473;
Float64 geospatial_lon_min 20.588676923833397;
Float64 geospatial_lat_max 43.077895640728009;
Float64 geospatial_lon_max 20.662956549374115;
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 title "ATLAS/ICESat-2 L3A Land Ice Height";
String identifier_file_product_type "ATL06";
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_20190419050509_03200302_001_01.h5
NSIDC DAAC > National Snow and Ice Data Center DAAC
nsidc@nsidc.org
http://nsidc.org/daac/
pointOfContact
2019-07-01T20:44:17.000000Z
ISO 19115-2 Geographic information - Metadata - Part 2: Extensions for imagery and gridded data
ISO 19115-2:2009-02-15
ATL06_20190419050509_03200302_001_01.h5
2019-07-01T20:44:17.000000Z
creation
ATL06
The ECS Short Name
001
The ECS Version ID
ATL06_20190419050509_03200302_001_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
001
largerWorkCitation
eng
geoscientificInformation
AscendingCrossing: 25.305794816923253 StartLatitude: 27.000000000000000 StartDirection:A EndLatitude: 59.500000000000000 EndDirection: A
gov.nasa.esdis.umm.orbitparameters
OrbitParameters
OrbitNumber: 3295 EquatorCrossingLongitude: 25.305794816923253 EquatorCrossingDateTime: 2019-04-19T04:58:06.944003Z
gov.nasa.esdis.umm.orbitcalculatedspatialdomains
OrbitCalculatedSpatialDomains
2019-04-19T05:05:09.000000Z
2019-04-19T05:13:39.000000Z
dataset
2019-07-01T20:44:17.000000Z;b8766250-e786-3c05-9e4f-2315bf80a2e7;Created by PGE atlas_l3a_is 4.1
2019-07-01T20:44:17.000000Z
";
String iso_19139_series_xml "
ATL06.001
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
001
ATL06
The ECS Short Name
001
The ECS Version ID
doi:10.5067/ATLAS/ATL06.001
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/ATL06.001
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 measureDesciption "TBD";
String nameOfMeasure "TBD";
String unitofMeasure "TBD";
String value "NOT_SET";
String fullnamepath "/METADATA/DataQuality/DomainConsistency";
}
METADATA_ProductSpecificationDocument {
String characterSet "utf8";
String edition "B";
String language "eng";
String publicationDate "12/1/17";
String ShortName "ATL06_SDP";
String title "ICESat-2-SIPS-SPEC-4260 - ATLAS Science Algorithm Standard Data Product (SDP) Volume 5 (ATL06). Revision B.";
String fullnamepath "/METADATA/ProductSpecificationDocument";
}
METADATA_SeriesIdentification {
String maintenanceAndUpdateFrequency "asNeeded";
String maintenanceDate "SET_BY_META";
String VersionID "001";
String identifier_product_DOI "10.5067/ATLAS/ATL06.001";
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 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 "2019-07-01T20:44:17.000000Z";
String uuid "b8766250-e786-3c05-9e4f-2315bf80a2e7";
String fileName "ATL06_20190419050509_03200302_001_01.h5";
String VersionID "001";
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 43.077895640728009;
Float64 eastBoundLongitude 20.662956549374115;
Float64 southBoundLatitude 42.801056260088473;
Float64 westBoundLongitude 20.588676923833397;
String rangeBeginningDateTime "2019-04-19T05:09:16.284098Z";
String rangeEndingDateTime "2019-04-19T05:09:20.925658Z";
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 "2019-07-01T20:44:27.000000Z";
String fileName "ATL06_20190419050509_03200302_001_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 "ATL06.001.series.xml";
String shortName "ANC36-06";
String uuid "4a56d86d-f6db-3081-b443-c78cfe63c70d";
String version "001";
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_001670133.ctl";
String shortName "CNTL";
String version "1";
String fullnamepath "/METADATA/Lineage/Control";
}
METADATA_Lineage_ANC28 {
String description "DTU13 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 "ATL06.001.dataset.xml";
String shortName "ANC38-06";
String uuid "e8c13f9e-3805-3088-bc5d-5038be918a8d";
String version "001";
String fullnamepath "/METADATA/Lineage/ANC38-06";
}
METADATA_Lineage_ANC06_02 {
String description "GIMP Digital Elevation Model reformatted into HDF5.";
String fileName "gimp30m_20140609_003_01.h5";
String shortName "ANC06-02";
String uuid "f0646795-8f61-32bd-9f0d-6e3ead9c8e92";
String version "20140609";
String fullnamepath "/METADATA/Lineage/ANC06-02";
}
METADATA_Lineage_ANC06_03 {
String description "Cryosat-2 1Km Antarctica Digital Elevation Model";
String fileName "cryo1km_20180705_001_01.nc";
String shortName "ANC06-03";
String uuid "c40c121e-791c-30f7-9a58-b688cac6e569";
String version "20180705";
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 "atl06_template.h5";
String shortName "ANC25-06";
String uuid "da26dbe3-6c64-3781-ac31-fa7710a8039e";
String version "041";
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 "atl06_metadata_template.h5";
String shortName "ANC26-06";
String uuid "0950df8c-45fe-3475-bd23-54e56aadd249";
String version "041";
String fullnamepath "/METADATA/Lineage/ANC26-06";
}
METADATA_Lineage_ATL03 {
String description "ICESat-2 ATLAS L2A Global Geolocated Photon data products.";
String fileName "ATL03_20190419050509_03200302_001_01.h5";
String shortName "ATL03";
String uuid "1e23393a-2cde-3179-824a-6f04e30f5320";
String version "001";
Int32 start_cycle 3;
Int32 end_cycle 3;
Int32 start_orbit 3295;
Int32 end_orbit 3295;
Int32 start_rgt 320;
Int32 end_rgt 320;
Int32 start_region 2;
Int32 end_region 2;
Int32 start_geoseg 149699;
Int32 end_geoseg 330713;
String fullnamepath "/METADATA/Lineage/ATL03";
}
METADATA_Lineage_ATL09 {
String description "ICESat-2 ATLAS L3A atmosphere data products.";
String fileName "ATL09_20190419045807_03200301_001_01.h5";
String shortName "ATL09";
String uuid "6da199d8-ab8d-3e6f-b96c-ffb5ce2d29d8";
String version "001";
Int32 start_cycle 3;
Int32 end_cycle 3;
Int32 start_orbit 3295;
Int32 end_orbit 3295;
Int32 start_rgt 320;
Int32 end_rgt 320;
Int32 start_region 1;
Int32 end_region 14;
Int32 start_geoseg 7;
Int32 end_geoseg 2007127;
String fullnamepath "/METADATA/Lineage/ATL09";
}
METADATA_Lineage_ANC06_01 {
String description "GMTED Digital Elevation Model reformatted into HDF5 and re-referenced to the WGS-84 ellipsoid.";
String fileName "gmted75_20180705_001_01.h5";
String shortName "ANC06-01";
String uuid "a44debc8-29af-3744-860c-227b37a4da6f";
String version "20180705";
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 2.1.1";
String softwareDate "Apr 23 2019";
String softwareTitle "Creates ATLAS HDF5 browse files";
String runTimeParameters "CTL_atlas_l3a_is_001670133.ctl";
String stepDateTime "2019-07-01T20:44:28.000000Z";
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 4.1.1";
String softwareDate "Apr 23 2019";
String softwareTitle "Creates ATLAS XML metadata files";
String runTimeParameters "CTL_atlas_l3a_is_001670133.ctl";
String stepDateTime "2019-07-01T20:44:33.000000Z";
String fullnamepath "/METADATA/ProcessStep/Metadata";
}
METADATA_ProcessStep_PGE {
String ATBDDate "11/15/17";
String ATBDTitle "ICESat-2-SIPS-SPEC-1605 - SIPs: Land Ice Products L5 Specification Document";
String ATBDVersion "Draft";
String documentation "ICESat-2-SIPS-SPEC-2328 - ATLAS Science Algorithm Software Design Description (SDD) Volume 9 (atlas_l3a_is). Revision C.";
String documentDate "12/1/17";
String processDescription "Computes surface heights for each beam, along and across-track slopes calculated for beam pairs.";
String identifier "atlas_l3a_is";
String softwareVersion "4.1";
String softwareDate "Apr 23 2019";
String softwareTitle "ASAS L3A Icesheet PGE";
String runTimeParameters "CTL_atlas_l3a_is_001670133.ctl";
String stepDateTime "2019-07-01T20:44:17.000000Z";
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 4.1";
String softwareDate "Apr 23 2019";
String softwareTitle "ATL06 QA Utility";
String runTimeParameters "CTL_atlas_l3a_is_001670133.ctl";
String stepDateTime "2019-07-01T20:44:27.000000Z";
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";
}
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_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";
}
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";
}
orbit_info_cycle_number {
String units "counts";
String contentType "referenceInformation";
String long_name "Cycle Number";
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 source "POD/PPD";
Int16 valid_min 0;
Int16 valid_max 50;
String origname "cycle_number";
String fullnamepath "/orbit_info/cycle_number";
String coordinates "orbit_info_crossing_time";
}
orbit_info_orbit_number {
String units "1";
String contentType "referenceInformation";
String long_name "Orbit Number";
String description "Unique identifying number for each planned ICESat-2 orbit.";
String source "Operations";
UInt16 valid_min 1;
UInt16 valid_max 65000;
String origname "orbit_number";
String fullnamepath "/orbit_info/orbit_number";
String coordinates "orbit_info_crossing_time";
}
orbit_info_lan {
String units "degrees_east";
String contentType "referenceInformation";
String long_name "Ascending Node Longitude";
String description "Longitude at the ascending node crossing.";
String source "POD/PPD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String origname "lan";
String fullnamepath "/orbit_info/lan";
String coordinates "orbit_info_crossing_time";
}
orbit_info_sc_orient {
String units "1";
String contentType "referenceInformation";
String long_name "Spacecraft Orientation";
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 source "POD/PPD";
String flag_meanings "backward forward transition";
Int16 flag_values 0, 1, 2;
Int16 valid_min 0;
Int16 valid_max 2;
String origname "sc_orient";
String fullnamepath "/orbit_info/sc_orient";
String coordinates "orbit_info_sc_orient_time";
}
orbit_info_rgt {
String units "counts";
String contentType "referenceInformation";
String long_name "Reference Ground track";
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 source "POD/PPD";
Int16 valid_min 1;
Int16 valid_max 1387;
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 units "meters";
String contentType "qualityInformation";
String long_name "Vertical Geolocation Error";
String description "Total vertical geolocation error due to PPD and POD, including the effects of horizontal geolocation error on the segment vertical error.";
String source "section 3.10";
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 units "meters";
String contentType "qualityInformation";
String long_name "Expected RMS segment misfit";
String description "Propagated error due to sampling error and FPB correction from the land ice algorithm";
String source "section 4.4";
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 units "meters";
String contentType "modelResult";
String long_name "Height Mean";
String description "Mean surface height, not corrected for first-photon bias or pulse truncation.";
String source "ATL06 ATBD";
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 units "1";
String contentType "qualityInformation";
String long_name "Signal Selection Source";
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 source "section 3.3.3";
String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed";
Int16 flag_values 0, 1, 2, 3;
Int16 valid_min 0;
Int16 valid_max 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 units "1";
String contentType "physicalMeasurement";
String long_name "SNR";
String description "Signal-to-noise ratio in the final refined window";
String source "section 3.6.2";
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 units "meters";
String contentType "referenceInformation";
String long_name "Robust Spread";
String description "RDE of misfit between PE heights and the along-track segment fit.";
String source "section 3.6.3";
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 contentType "referenceInformation";
String long_name "Number potential segment pulses";
String description "The number of pulses potentially included in the segment";
String source "section 3.3.3";
Int32 _FillValue 2147483647;
String units "counts";
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 units "meters/meters";
String contentType "qualityInformation";
String long_name "Sigma of Along Track Slope";
String description "Propagated error in the along-track segment slope";
String source "section 3.6.4";
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 units "1";
String contentType "physicalMeasurement";
String long_name "SNR Significance";
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 source "section 3.6.2";
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 units "meters";
String contentType "qualityInformation";
String long_name "Expected RMS misfit";
String description "Expected RMS misfit between PE heights and along-track segment fit";
String source "section 3.6.3";
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 units "meters/meters";
String contentType "physicalMeasurement";
String long_name "Across Track Slope";
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 source "section 3.7";
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 units "meters";
String contentType "qualityInformation";
String long_name "Height Error";
String description "Propagated height error due to PE-height sampling error for height from the along-track fit, not including geolocation-induced error";
String source "section 3.6.4";
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 units "meters";
String contentType "qualityInformation";
String long_name "RMS Misfit";
String description "RMS misfit between PE heights and along- track segment fit";
String source "section 3.6.3";
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 units "1";
String contentType "qualityInformation";
String long_name "Signal Selection Source Status";
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 eacoh of the signal_selection_status flags. (See Land Ice ATBD Table 3-2).";
String source "section 3.3.3";
Int16 valid_min 0;
Int16 valid_max 4;
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 units "meters/meters";
String contentType "physicalMeasurement";
String long_name "Along Track Slope";
String description "Along-track slope from along-track segment fit";
String source "section 3.3.5.1";
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 units "1";
String contentType "physicalMeasurement";
String long_name "Number of Photons in Fit";
String description "Number of PEs used in determining h_li, after editing";
String source "section 3.3.5.2";
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 units "meters";
String contentType "physicalMeasurement";
String long_name "Surface Window Width";
String description "Width of the surface window, top to bottom";
String source "section 3.3.5.2";
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 units "degrees_east";
String contentType "physicalMeasurement";
String long_name "Longitude";
String standard_name "longitude";
String description "Longitude of segment center, , WGS84, East=+";
String source "section 3.10";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
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 units "degrees_north";
String contentType "physicalMeasurement";
String long_name "Latitude";
String standard_name "latitude";
String description "Latitude of segment center, WGS84, North=+,";
String source "section 3.10";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
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 units "meters";
String contentType "physicalMeasurement";
String long_name "Land Ice height";
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 source "section 4.4";
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 {
Float32 _FillValue 3.402823466e+38;
String units "radians";
String contentType "referenceInformation";
String long_name "Azimuth";
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 source "ATL03g, Section 3.3";
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 units "degrees";
String contentType "referenceInformation";
String long_name "Segment Azimuth";
String description "Azimuth of the pair-track, east of local north.";
String source "section 3.1.2.2";
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 {
String contentType "qualityInformation";
String long_name "Across Track Geolocation Error";
String description "Along-track component of the geolocation error.";
String source "section 3.10";
Float32 _FillValue 3.402823466e+38;
String units "meters";
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_xt {
Float32 _FillValue 3.402823466e+38;
String units "meters";
String contentType "qualityInformation";
String long_name "Along Track Geolocation Error";
String description "Across-track component of the geolocation error.";
String source "section 3.10";
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_ref_coelv {
Float32 _FillValue 3.402823466e+38;
String units "radians";
String contentType "referenceInformation";
String long_name "Co-elevation";
String description "Coelevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot.";
String source "ATL03g, Section 3.3";
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_x_atc {
Float64 _FillValue 1.7976931348623157e+308;
String units "meters";
String contentType "referenceInformation";
String long_name "X Along Track";
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 source "section 3.1.2.2";
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 units "meters";
String contentType "referenceInformation";
String long_name "Y Along Track";
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 source "section 3.1.2.2";
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 units "1";
String contentType "referenceInformation";
String long_name "DEM Source Flag";
String description "Indicates source of the DEM height. Values: 0=None, 1=GIMP, 2=GMTED, 3=MSS, 4=Antarctic.";
String source "DTU10/GMTED/GIMP";
String flag_meanings "none gimp gmted mss antarctic";
Int16 flag_values 0, 1, 2, 3, 4;
Int16 valid_min 0;
Int16 valid_max 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_dem_h {
String units "meters";
String contentType "referenceInformation";
String long_name "DEM Height";
String description "Height of the DEM, interpolated by cubic-spline interpolation in the DEM coordinate system to the PE location.";
String source "DTU10/GMTED/GIMP";
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 units "meters";
String contentType "referenceInformation";
String long_name "Geoid Height";
String description "Geoid height above WGS-84 reference ellipsoid (range -107 to 86m),";
String source "EGM2008";
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 {
String contentType "referenceInformation";
String long_name "Multiple Scattering Warning Flag";
String description "Combined flag indicating the risks of severe multiple scattering. 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 source "ATL09";
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;
Int16 valid_min -1;
Int16 valid_max 5;
Int16 _FillValue 127;
String units "1";
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_bsnow_conf {
Int16 _FillValue 127;
String units "1";
String contentType "referenceInformation";
String long_name "Blowing Snow confidence";
String description "Confidence flag for presence of blowing snow";
String source "ATL09";
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 units "meters";
String contentType "referenceInformation";
String long_name "Blowing Snow Layer Top Height";
String description "Blowing snow layer top height";
String source "ATL09";
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 units "meters";
String contentType "referenceInformation";
String long_name "Ocean Tide";
String description "Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium).";
String source "ATL03 ATBD, Section 6.3.1";
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 units "meters";
String contentType "referenceInformation";
String long_name "Earth Tide";
String description "Solid Earth Tides";
String source "ATL03 ATBD, Section 6.3.3";
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 units "degrees_east";
String contentType "referenceInformation";
String long_name "solar azimuth";
String description "The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot.";
String source "ATL03";
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 units "1";
String contentType "referenceInformation";
String long_name "Effective uncorrected reflectance";
String description "Effective reflectance, uncorrected for atmospheric effects.";
String source "section 3.1.5.4";
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 units "meters";
String contentType "referenceInformation";
String long_name "Dynamic Atmosphere Correction";
String description "Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect.";
String source "ATL03, 6.3.2";
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 units "meters";
String contentType "referenceInformation";
String long_name "Load Tide";
String description "Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm).";
String source "ATL03 ATBD, Section 6.3.4";
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_bsnow_od {
Float32 _FillValue 3.402823466e+38;
String units "1";
String contentType "modelResult";
String long_name "Blowing snow OD";
String description "Optical thickness of blowing snow layer.";
String source "ATL09";
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_cloud_flg_atm {
Int16 _FillValue 127;
String units "1";
String contentType "referenceInformation";
String long_name "Cloud flag";
String description "Indicates the probability of clouds based on backscatter measurements";
String source "ATL09";
String flag_meanings "no yes";
Int16 flag_values 0, 1;
Int16 valid_min 0;
Int16 valid_max 1;
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 units "degrees";
String contentType "referenceInformation";
String long_name "solar elevation";
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 source "ATL03";
Float32 valid_min -90.00000000;
Float32 valid_max 90.00000000;
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 units "meters";
String contentType "referenceInformation";
String long_name "Solid Earth Pole Tide";
String description "Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm).";
String source "ATL03 ATBD, Section 6.3.5";
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 units "hz";
String contentType "referenceInformation";
String long_name "Expected background count rate";
String description "Expected background count rate based on sun angle, surface slope, for unit surface reflectance";
String source "section 3.6.1";
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 units "1";
String contentType "referenceInformation";
String long_name "cloud flag confidence";
String description "Indicates cloud attenuation as calculated from the apparent surface reflectance, assuming a white snow surface";
String source "ATL09";
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;
Int16 valid_min 0;
Int16 valid_max 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 units "hz";
String contentType "referenceInformation";
String long_name "Background count rate";
String description "Background count rate, derived from the ATL03 50-shot-average, interpolated to the segment center.";
String source "section 3.6.1";
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 units "meters";
String contentType "referenceInformation";
String long_name "Total Neutral Atmospheric Delay";
String description "Total neutral atmosphere delay correction (wet+dry).";
String source "ATL03a ATBD";
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 units "1";
String contentType "qualityInformation";
String long_name "ATL06_Quality_Summary";
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 source "section 4.3";
String flag_meanings "best_quality potential_problem";
Int16 flag_values 0, 1;
Int16 valid_min 0;
Int16 valid_max 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 units "1";
String contentType "referenceInformation";
String long_name "Reference Point, m";
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 source "section 3.1.2.1";
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 {
String contentType "qualityInformation";
String long_name "first photon bias mean correction";
String description "Estimated first-photon bias (fpb) correction to mean segment height";
String source "section 3.4.3.1";
Float32 _FillValue 3.402823466e+38;
String units "meters";
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 contentType "qualityInformation";
String long_name "fpb mean corr sigma";
String description "Estimated error in fpb_mean_corr";
String source "section 3.4.3.1";
Float32 _FillValue 3.402823466e+38;
String units "meters";
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 units "meters";
String contentType "qualityInformation";
String long_name "fpb median corr";
String description "First-photon-bias correction giving the difference between the mean segment height and the corrected median height";
String source "section 3.4.3.2";
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 units "meters";
String contentType "qualityInformation";
String long_name "fpb median corr sigma";
String description "Estimated error in fpb_med_corr";
String source "section 3.4.3.2";
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 units "counts";
String contentType "qualityInformation";
String long_name "fpb number photons corr";
String description "Estimated window photon count after first-photon-bias correction";
String source "section 4.3.3.3";
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 units "meters";
String contentType "qualityInformation";
String long_name "tx shape mean correction";
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 source "section 3.5";
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 units "meters";
String contentType "qualityInformation";
String long_name "mean median residual";
String description "Difference between uncorrected mean and median of linear fit residuals";
String source "section 3.3.5";
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 units "meters";
String contentType "qualityInformation";
String long_name "tx shape median correction";
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 source "section 3.5";
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 {
String units "counts";
String contentType "physicalMeasurement";
String long_name "Bin Counts";
String description "Residual count in 1-cm bins, for PE within 10 (horizontal) m of segment centers for each histogram.";
String source "Section 4.11";
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 units "degrees_north";
String contentType "physicalMeasurement";
String long_name "Latitude Mean";
String standard_name "latitude";
String description "Mean latitude of the segments included in the histogram";
String source "Section 4.11";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
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_bckgrd_per_bin {
String units "1";
String contentType "physicalMeasurement";
String long_name "Expected background PEs";
String description "Number of background PE expected for the bins in each column of the histogram based on the observed background rate (bckgrd).";
String source "Section 4.11";
String origname "bckgrd_per_bin";
String fullnamepath "/gt1r/residual_histogram/bckgrd_per_bin";
String coordinates "gt1r_residual_histogram_delta_time gt1r_residual_histogram_lat_mean gt1r_residual_histogram_lon_mean";
}
gt1r_residual_histogram_x_atc_mean {
String units "1";
String contentType "physicalMeasurement";
String long_name "Along Track Coordinate Mean";
String description "Mean along-track coordinate of the segments included in the histogram.";
String source "Section 4.11";
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 units "1";
String contentType "referenceInformation";
String long_name "Segment ID List";
String description "Segments ids included in each column of the histogram";
String source "Section 4.11";
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_pulse_count {
String units "counts";
String contentType "physicalMeasurement";
String long_name "Number of Histogram Segment Pulses";
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 source "Section 4.11";
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 units "degrees_east";
String contentType "physicalMeasurement";
String long_name "Longitude Mean";
String standard_name "longitude";
String description "Mean longitude of the segments included in the histogram";
String source "Section 4.11";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
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 units "1";
String long_name "Land Ice Height Index";
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 source "section 4.2";
String contentType "referenceInformation";
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 units "degrees_north";
String long_name "Latitude";
String standard_name "latitude";
String description "Latitude of the reference segment location on the RPT";
String source "section 3.1.9";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
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 units "degrees_east";
String contentType "referenceInformation";
String long_name "Longitude";
String standard_name "longitude";
String description "Longitude of the reference segment location on the RPT";
String source "section 3.1.9";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
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 units "1";
String contentType "referenceInformation";
String long_name "Reference Point, m";
String description "Segment number corresponding to the second of two ATL03 segments in the ATL06 segment, counted from the RGT equator crossing";
String source "section 3.1.2.1";
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 units "1";
String contentType "qualityInformation";
String long_name "Signal Selection Source";
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 source "section 3.3.3";
String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed";
Int16 flag_values 0, 1, 2, 3;
Int16 valid_min 0;
Int16 valid_max 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 contentType "qualityInformation";
String long_name "Signal Selection Status Flag";
String description "Indicates confidence of the signal-selection algorithm using all ATL03-flagged PEs. 0=Signal selection succeeded using all ATL03-flagged PEs (or algorthm 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 source "section 3.3.3";
String flag_meanings "succeeded failed_20 failed_10 failed_both";
Int16 flag_values 0, 1, 2, 3;
Int16 valid_min 0;
Int16 valid_max 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 contentType "qualityInformation";
String long_name "Signal Selection Backup Flag";
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 source "section 3.3.3";
String flag_meanings "succeeded failed_widen failed_20 failed_10 failed_both";
Int16 flag_values 0, 1, 2, 3, 4;
Int16 valid_min 0;
Int16 valid_max 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 contentType "qualityInformation";
String long_name "Signal Selection Confident Flag";
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 source "section 3.3.3";
String flag_meanings "succeeded failed_20 failed_10 failed_both";
Int16 flag_values 0, 1, 2, 3;
Int16 valid_min 0;
Int16 valid_max 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";
}
gt1l_land_ice_segments_sigma_geo_h {
Float32 _FillValue 3.402823466e+38;
String units "meters";
String contentType "qualityInformation";
String long_name "Vertical Geolocation Error";
String description "Total vertical geolocation error due to PPD and POD, including the effects of horizontal geolocation error on the segment vertical error.";
String source "section 3.10";
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 units "meters";
String contentType "qualityInformation";
String long_name "Expected RMS segment misfit";
String description "Propagated error due to sampling error and FPB correction from the land ice algorithm";
String source "section 4.4";
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 units "meters";
String contentType "modelResult";
String long_name "Height Mean";
String description "Mean surface height, not corrected for first-photon bias or pulse truncation.";
String source "ATL06 ATBD";
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 units "1";
String contentType "qualityInformation";
String long_name "Signal Selection Source";
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 source "section 3.3.3";
String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed";
Int16 flag_values 0, 1, 2, 3;
Int16 valid_min 0;
Int16 valid_max 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 units "1";
String contentType "physicalMeasurement";
String long_name "SNR";
String description "Signal-to-noise ratio in the final refined window";
String source "section 3.6.2";
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 units "meters";
String contentType "referenceInformation";
String long_name "Robust Spread";
String description "RDE of misfit between PE heights and the along-track segment fit.";
String source "section 3.6.3";
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 contentType "referenceInformation";
String long_name "Number potential segment pulses";
String description "The number of pulses potentially included in the segment";
String source "section 3.3.3";
Int32 _FillValue 2147483647;
String units "counts";
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 units "meters/meters";
String contentType "qualityInformation";
String long_name "Sigma of Along Track Slope";
String description "Propagated error in the along-track segment slope";
String source "section 3.6.4";
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 units "1";
String contentType "physicalMeasurement";
String long_name "SNR Significance";
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 source "section 3.6.2";
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 units "meters";
String contentType "qualityInformation";
String long_name "Expected RMS misfit";
String description "Expected RMS misfit between PE heights and along-track segment fit";
String source "section 3.6.3";
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 units "meters/meters";
String contentType "physicalMeasurement";
String long_name "Across Track Slope";
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 source "section 3.7";
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 units "meters";
String contentType "qualityInformation";
String long_name "Height Error";
String description "Propagated height error due to PE-height sampling error for height from the along-track fit, not including geolocation-induced error";
String source "section 3.6.4";
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 units "meters";
String contentType "qualityInformation";
String long_name "RMS Misfit";
String description "RMS misfit between PE heights and along- track segment fit";
String source "section 3.6.3";
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 units "1";
String contentType "qualityInformation";
String long_name "Signal Selection Source Status";
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 eacoh of the signal_selection_status flags. (See Land Ice ATBD Table 3-2).";
String source "section 3.3.3";
Int16 valid_min 0;
Int16 valid_max 4;
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 units "meters/meters";
String contentType "physicalMeasurement";
String long_name "Along Track Slope";
String description "Along-track slope from along-track segment fit";
String source "section 3.3.5.1";
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 units "1";
String contentType "physicalMeasurement";
String long_name "Number of Photons in Fit";
String description "Number of PEs used in determining h_li, after editing";
String source "section 3.3.5.2";
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 units "meters";
String contentType "physicalMeasurement";
String long_name "Surface Window Width";
String description "Width of the surface window, top to bottom";
String source "section 3.3.5.2";
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 units "degrees_east";
String contentType "physicalMeasurement";
String long_name "Longitude";
String standard_name "longitude";
String description "Longitude of segment center, , WGS84, East=+";
String source "section 3.10";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
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 units "degrees_north";
String contentType "physicalMeasurement";
String long_name "Latitude";
String standard_name "latitude";
String description "Latitude of segment center, WGS84, North=+,";
String source "section 3.10";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
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 units "meters";
String contentType "physicalMeasurement";
String long_name "Land Ice height";
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 source "section 4.4";
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 {
Float32 _FillValue 3.402823466e+38;
String units "radians";
String contentType "referenceInformation";
String long_name "Azimuth";
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 source "ATL03g, Section 3.3";
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 units "degrees";
String contentType "referenceInformation";
String long_name "Segment Azimuth";
String description "Azimuth of the pair-track, east of local north.";
String source "section 3.1.2.2";
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 {
String contentType "qualityInformation";
String long_name "Across Track Geolocation Error";
String description "Along-track component of the geolocation error.";
String source "section 3.10";
Float32 _FillValue 3.402823466e+38;
String units "meters";
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_xt {
Float32 _FillValue 3.402823466e+38;
String units "meters";
String contentType "qualityInformation";
String long_name "Along Track Geolocation Error";
String description "Across-track component of the geolocation error.";
String source "section 3.10";
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_ref_coelv {
Float32 _FillValue 3.402823466e+38;
String units "radians";
String contentType "referenceInformation";
String long_name "Co-elevation";
String description "Coelevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot.";
String source "ATL03g, Section 3.3";
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_x_atc {
Float64 _FillValue 1.7976931348623157e+308;
String units "meters";
String contentType "referenceInformation";
String long_name "X Along Track";
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 source "section 3.1.2.2";
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 units "meters";
String contentType "referenceInformation";
String long_name "Y Along Track";
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 source "section 3.1.2.2";
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 units "1";
String contentType "referenceInformation";
String long_name "DEM Source Flag";
String description "Indicates source of the DEM height. Values: 0=None, 1=GIMP, 2=GMTED, 3=MSS, 4=Antarctic.";
String source "DTU10/GMTED/GIMP";
String flag_meanings "none gimp gmted mss antarctic";
Int16 flag_values 0, 1, 2, 3, 4;
Int16 valid_min 0;
Int16 valid_max 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_dem_h {
String units "meters";
String contentType "referenceInformation";
String long_name "DEM Height";
String description "Height of the DEM, interpolated by cubic-spline interpolation in the DEM coordinate system to the PE location.";
String source "DTU10/GMTED/GIMP";
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 units "meters";
String contentType "referenceInformation";
String long_name "Geoid Height";
String description "Geoid height above WGS-84 reference ellipsoid (range -107 to 86m),";
String source "EGM2008";
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 {
String contentType "referenceInformation";
String long_name "Multiple Scattering Warning Flag";
String description "Combined flag indicating the risks of severe multiple scattering. 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 source "ATL09";
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;
Int16 valid_min -1;
Int16 valid_max 5;
Int16 _FillValue 127;
String units "1";
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_bsnow_conf {
Int16 _FillValue 127;
String units "1";
String contentType "referenceInformation";
String long_name "Blowing Snow confidence";
String description "Confidence flag for presence of blowing snow";
String source "ATL09";
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 units "meters";
String contentType "referenceInformation";
String long_name "Blowing Snow Layer Top Height";
String description "Blowing snow layer top height";
String source "ATL09";
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 units "meters";
String contentType "referenceInformation";
String long_name "Ocean Tide";
String description "Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium).";
String source "ATL03 ATBD, Section 6.3.1";
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 units "meters";
String contentType "referenceInformation";
String long_name "Earth Tide";
String description "Solid Earth Tides";
String source "ATL03 ATBD, Section 6.3.3";
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 units "degrees_east";
String contentType "referenceInformation";
String long_name "solar azimuth";
String description "The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot.";
String source "ATL03";
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 units "1";
String contentType "referenceInformation";
String long_name "Effective uncorrected reflectance";
String description "Effective reflectance, uncorrected for atmospheric effects.";
String source "section 3.1.5.4";
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 units "meters";
String contentType "referenceInformation";
String long_name "Dynamic Atmosphere Correction";
String description "Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect.";
String source "ATL03, 6.3.2";
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 units "meters";
String contentType "referenceInformation";
String long_name "Load Tide";
String description "Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm).";
String source "ATL03 ATBD, Section 6.3.4";
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_bsnow_od {
Float32 _FillValue 3.402823466e+38;
String units "1";
String contentType "modelResult";
String long_name "Blowing snow OD";
String description "Optical thickness of blowing snow layer.";
String source "ATL09";
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_cloud_flg_atm {
Int16 _FillValue 127;
String units "1";
String contentType "referenceInformation";
String long_name "Cloud flag";
String description "Indicates the probability of clouds based on backscatter measurements";
String source "ATL09";
String flag_meanings "no yes";
Int16 flag_values 0, 1;
Int16 valid_min 0;
Int16 valid_max 1;
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 units "degrees";
String contentType "referenceInformation";
String long_name "solar elevation";
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 source "ATL03";
Float32 valid_min -90.00000000;
Float32 valid_max 90.00000000;
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 units "meters";
String contentType "referenceInformation";
String long_name "Solid Earth Pole Tide";
String description "Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm).";
String source "ATL03 ATBD, Section 6.3.5";
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 units "hz";
String contentType "referenceInformation";
String long_name "Expected background count rate";
String description "Expected background count rate based on sun angle, surface slope, for unit surface reflectance";
String source "section 3.6.1";
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 units "1";
String contentType "referenceInformation";
String long_name "cloud flag confidence";
String description "Indicates cloud attenuation as calculated from the apparent surface reflectance, assuming a white snow surface";
String source "ATL09";
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;
Int16 valid_min 0;
Int16 valid_max 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 units "hz";
String contentType "referenceInformation";
String long_name "Background count rate";
String description "Background count rate, derived from the ATL03 50-shot-average, interpolated to the segment center.";
String source "section 3.6.1";
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 units "meters";
String contentType "referenceInformation";
String long_name "Total Neutral Atmospheric Delay";
String description "Total neutral atmosphere delay correction (wet+dry).";
String source "ATL03a ATBD";
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 units "1";
String contentType "qualityInformation";
String long_name "ATL06_Quality_Summary";
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 source "section 4.3";
String flag_meanings "best_quality potential_problem";
Int16 flag_values 0, 1;
Int16 valid_min 0;
Int16 valid_max 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 units "1";
String contentType "referenceInformation";
String long_name "Reference Point, m";
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 source "section 3.1.2.1";
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 {
String contentType "qualityInformation";
String long_name "first photon bias mean correction";
String description "Estimated first-photon bias (fpb) correction to mean segment height";
String source "section 3.4.3.1";
Float32 _FillValue 3.402823466e+38;
String units "meters";
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 contentType "qualityInformation";
String long_name "fpb mean corr sigma";
String description "Estimated error in fpb_mean_corr";
String source "section 3.4.3.1";
Float32 _FillValue 3.402823466e+38;
String units "meters";
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 units "meters";
String contentType "qualityInformation";
String long_name "fpb median corr";
String description "First-photon-bias correction giving the difference between the mean segment height and the corrected median height";
String source "section 3.4.3.2";
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 units "meters";
String contentType "qualityInformation";
String long_name "fpb median corr sigma";
String description "Estimated error in fpb_med_corr";
String source "section 3.4.3.2";
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 units "counts";
String contentType "qualityInformation";
String long_name "fpb number photons corr";
String description "Estimated window photon count after first-photon-bias correction";
String source "section 4.3.3.3";
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 units "meters";
String contentType "qualityInformation";
String long_name "tx shape mean correction";
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 source "section 3.5";
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 units "meters";
String contentType "qualityInformation";
String long_name "mean median residual";
String description "Difference between uncorrected mean and median of linear fit residuals";
String source "section 3.3.5";
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 units "meters";
String contentType "qualityInformation";
String long_name "tx shape median correction";
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 source "section 3.5";
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 {
String units "counts";
String contentType "physicalMeasurement";
String long_name "Bin Counts";
String description "Residual count in 1-cm bins, for PE within 10 (horizontal) m of segment centers for each histogram.";
String source "Section 4.11";
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 units "degrees_north";
String contentType "physicalMeasurement";
String long_name "Latitude Mean";
String standard_name "latitude";
String description "Mean latitude of the segments included in the histogram";
String source "Section 4.11";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
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_bckgrd_per_bin {
String units "1";
String contentType "physicalMeasurement";
String long_name "Expected background PEs";
String description "Number of background PE expected for the bins in each column of the histogram based on the observed background rate (bckgrd).";
String source "Section 4.11";
String origname "bckgrd_per_bin";
String fullnamepath "/gt1l/residual_histogram/bckgrd_per_bin";
String coordinates "gt1l_residual_histogram_delta_time gt1l_residual_histogram_lat_mean gt1l_residual_histogram_lon_mean";
}
gt1l_residual_histogram_x_atc_mean {
String units "1";
String contentType "physicalMeasurement";
String long_name "Along Track Coordinate Mean";
String description "Mean along-track coordinate of the segments included in the histogram.";
String source "Section 4.11";
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 units "1";
String contentType "referenceInformation";
String long_name "Segment ID List";
String description "Segments ids included in each column of the histogram";
String source "Section 4.11";
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_pulse_count {
String units "counts";
String contentType "physicalMeasurement";
String long_name "Number of Histogram Segment Pulses";
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 source "Section 4.11";
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 units "degrees_east";
String contentType "physicalMeasurement";
String long_name "Longitude Mean";
String standard_name "longitude";
String description "Mean longitude of the segments included in the histogram";
String source "Section 4.11";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
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 units "1";
String long_name "Land Ice Height Index";
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 source "section 4.2";
String contentType "referenceInformation";
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 units "degrees_north";
String long_name "Latitude";
String standard_name "latitude";
String description "Latitude of the reference segment location on the RPT";
String source "section 3.1.9";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
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 units "degrees_east";
String contentType "referenceInformation";
String long_name "Longitude";
String standard_name "longitude";
String description "Longitude of the reference segment location on the RPT";
String source "section 3.1.9";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
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 units "1";
String contentType "referenceInformation";
String long_name "Reference Point, m";
String description "Segment number corresponding to the second of two ATL03 segments in the ATL06 segment, counted from the RGT equator crossing";
String source "section 3.1.2.1";
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 units "1";
String contentType "qualityInformation";
String long_name "Signal Selection Source";
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 source "section 3.3.3";
String flag_meanings "succeeded_using_pe succeeded_using_flagged_pe succeeded_using_backup failed";
Int16 flag_values 0, 1, 2, 3;
Int16 valid_min 0;
Int16 valid_max 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 contentType "qualityInformation";
String long_name "Signal Selection Status Flag";
String description "Indicates confidence of the signal-selection algorithm using all ATL03-flagged PEs. 0=Signal selection succeeded using all ATL03-flagged PEs (or algorthm 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 source "section 3.3.3";
String flag_meanings "succeeded failed_20 failed_10 failed_both";
Int16 flag_values 0, 1, 2, 3;
Int16 valid_min 0;
Int16 valid_max 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 contentType "qualityInformation";
String long_name "Signal Selection Backup Flag";
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 source "section 3.3.3";
String flag_meanings "succeeded failed_widen failed_20 failed_10 failed_both";
Int16 flag_values 0, 1, 2, 3, 4;
Int16 valid_min 0;
Int16 valid_max 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 contentType "qualityInformation";
String long_name "Signal Selection Confident Flag";
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 source "section 3.3.3";
String flag_meanings "succeeded failed_20 failed_10 failed_both";
Int16 flag_values 0, 1, 2, 3;
Int16 valid_min 0;
Int16 valid_max 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 units "1";
String contentType "qualityInformation";
String long_name "Granule Pass Flag";
String description "Flag indicating granule quality. 0=granule passes automatic QA. 1=granule fails automatic QA.";
String source "Operations";
String flag_meanings "PASS FAIL";
Int32 flag_values 0, 1;
Int32 valid_min 0;
Int32 valid_max 1;
String origname "qa_granule_pass_fail";
String fullnamepath "/quality_assessment/qa_granule_pass_fail";
}
quality_assessment_gt1r_lon_mean {
String units "degrees_east";
String contentType "physicalMeasurement";
String long_name "Longitude Mean";
String standard_name "longitude";
String description "Mean longitude of the 10km segment.";
String source "Section 4.11";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
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 units "1";
String contentType "qualityInformation";
String long_name "Signal Selection Source Fraction 0";
String description "The fraction of 20m segments with signal_selection_source equal to zero.";
String source "section 7.2";
Float32 valid_min 0.000000000;
Float32 valid_max 1.000000000;
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_ quality_assessment_gt1r_lon_mean";
}
quality_assessment_gt1r_signal_selection_source_fraction_1 {
String units "1";
String contentType "qualityInformation";
String long_name "Signal Selection Source Fraction 1";
String description "The fraction of 20m segments with signal_selection_source equal to 1.";
String source "section 7.2";
Float32 valid_min 0.000000000;
Float32 valid_max 1.000000000;
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_ quality_assessment_gt1r_lon_mean";
}
quality_assessment_gt1r_signal_selection_source_fraction_2 {
String units "1";
String contentType "qualityInformation";
String long_name "Signal Selection Source Fraction 2";
String description "The fraction of 20m segments with signal_selection_source equal to 2.";
String source "section 7.2";
Float32 valid_min 0.000000000;
Float32 valid_max 1.000000000;
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_ quality_assessment_gt1r_lon_mean";
}
quality_assessment_gt1r_lat_mean {
String units "degrees_north";
String contentType "physicalMeasurement";
String long_name "Latitude Mean";
String standard_name "latitude";
String description "Mean latitude of the 10km segment.";
String source "Section 4.11";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
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 units "1";
String contentType "qualityInformation";
String long_name "Signal Selection Source Fraction 3";
String description "The fraction of 20m segments with signal_selection_source equal to 3.";
String source "section 7.2";
Float32 valid_min 0.000000000;
Float32 valid_max 1.000000000;
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_ quality_assessment_gt1r_lon_mean";
}
quality_assessment_qa_granule_fail_reason {
String units "1";
String contentType "qualityInformation";
String long_name "Granule Failure Reason";
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 source "Operations";
String flag_meanings "no_failure PROCESS_ERROR INSUFFICIENT_OUTPUT failure_3 failure_4 OTHER_FAILURE";
Int32 flag_values 0, 1, 2, 3, 4, 5;
Int32 valid_min 0;
Int32 valid_max 5;
String origname "qa_granule_fail_reason";
String fullnamepath "/quality_assessment/qa_granule_fail_reason";
}
quality_assessment_gt1l_lon_mean {
String units "degrees_east";
String contentType "physicalMeasurement";
String long_name "Longitude Mean";
String standard_name "longitude";
String description "Mean longitude of the 10km segment.";
String source "Section 4.11";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
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 units "1";
String contentType "qualityInformation";
String long_name "Signal Selection Source Fraction 0";
String description "The fraction of 20m segments with signal_selection_source equal to zero.";
String source "section 7.2";
Float32 valid_min 0.000000000;
Float32 valid_max 1.000000000;
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_ quality_assessment_gt1l_lon_mean";
}
quality_assessment_gt1l_signal_selection_source_fraction_1 {
String units "1";
String contentType "qualityInformation";
String long_name "Signal Selection Source Fraction 1";
String description "The fraction of 20m segments with signal_selection_source equal to 1.";
String source "section 7.2";
Float32 valid_min 0.000000000;
Float32 valid_max 1.000000000;
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_ quality_assessment_gt1l_lon_mean";
}
quality_assessment_gt1l_signal_selection_source_fraction_2 {
String units "1";
String contentType "qualityInformation";
String long_name "Signal Selection Source Fraction 2";
String description "The fraction of 20m segments with signal_selection_source equal to 2.";
String source "section 7.2";
Float32 valid_min 0.000000000;
Float32 valid_max 1.000000000;
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_ quality_assessment_gt1l_lon_mean";
}
quality_assessment_gt1l_lat_mean {
String units "degrees_north";
String contentType "physicalMeasurement";
String long_name "Latitude Mean";
String standard_name "latitude";
String description "Mean latitude of the 10km segment.";
String source "Section 4.11";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
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 units "1";
String contentType "qualityInformation";
String long_name "Signal Selection Source Fraction 3";
String description "The fraction of 20m segments with signal_selection_source equal to 3.";
String source "section 7.2";
Float32 valid_min 0.000000000;
Float32 valid_max 1.000000000;
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_ quality_assessment_gt1l_lon_mean";
}
ancillary_data_release {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Release Number";
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 source "Operations";
String origname "release";
String fullnamepath "/ancillary_data/release";
}
ancillary_data_end_geoseg {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Ending Geolocation Segment";
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 source "Derived";
String origname "end_geoseg";
String fullnamepath "/ancillary_data/end_geoseg";
}
ancillary_data_version {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Version";
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 source "Operations";
String origname "version";
String fullnamepath "/ancillary_data/version";
}
ancillary_data_end_region {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Ending Region";
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 source "Derived";
String origname "end_region";
String fullnamepath "/ancillary_data/end_region";
}
ancillary_data_atlas_sdp_gps_epoch {
String units "seconds since 1980-01-06T00:00:00.000000Z";
String contentType "auxiliaryInformation";
String long_name "ATLAS Epoch Offset";
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 source "Operations";
String origname "atlas_sdp_gps_epoch";
String fullnamepath "/ancillary_data/atlas_sdp_gps_epoch";
}
ancillary_data_end_rgt {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Ending Reference Groundtrack";
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 source "Derived";
Int32 valid_min 1;
Int32 valid_max 1387;
String origname "end_rgt";
String fullnamepath "/ancillary_data/end_rgt";
}
ancillary_data_end_delta_time {
String units "seconds since 2018-01-01";
String contentType "auxiliaryInformation";
String long_name "ATLAS End Time (Actual)";
String standard_name "time";
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 source "Derived";
String origname "end_delta_time";
String fullnamepath "/ancillary_data/end_delta_time";
}
ancillary_data_end_orbit {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Ending Orbit Number";
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 source "Derived";
String origname "end_orbit";
String fullnamepath "/ancillary_data/end_orbit";
}
ancillary_data_start_cycle {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Starting Cycle";
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 source "Derived";
Int32 valid_min 0;
Int32 valid_max 99;
String origname "start_cycle";
String fullnamepath "/ancillary_data/start_cycle";
}
ancillary_data_data_end_utc {
String units "1";
String contentType "auxiliaryInformation";
String long_name "End UTC Time of Granule (CCSDS-A, Actual)";
String description "UTC (in CCSDS-A format) of the last data point within the granule.";
String source "Derived";
String origname "data_end_utc";
String fullnamepath "/ancillary_data/data_end_utc";
}
ancillary_data_control {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Control File";
String description "PGE-specific control file used to generate this granule. To re-use, replace breaks (BR) with linefeeds.";
String source "Operations";
String origname "control";
String fullnamepath "/ancillary_data/control";
}
ancillary_data_start_gpssow {
String units "seconds";
String contentType "auxiliaryInformation";
String long_name "Start GPS SOW of Granule (Actual)";
String description "GPS seconds-of-week of the first data point in the granule.";
String source "Derived";
String origname "start_gpssow";
String fullnamepath "/ancillary_data/start_gpssow";
}
ancillary_data_granule_end_utc {
String units "1";
String contentType "auxiliaryInformation";
String long_name "End UTC Time of Granule (CCSDS-A, Requested)";
String description "Requested end time (in UTC CCSDS-A) of this granule.";
String source "Derived";
String origname "granule_end_utc";
String fullnamepath "/ancillary_data/granule_end_utc";
}
ancillary_data_end_cycle {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Ending Cycle";
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 source "Derived";
Int32 valid_min 0;
Int32 valid_max 99;
String origname "end_cycle";
String fullnamepath "/ancillary_data/end_cycle";
}
ancillary_data_granule_start_utc {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Start UTC Time of Granule (CCSDS-A, Requested)";
String description "Requested start time (in UTC CCSDS-A) of this granule.";
String source "Derived";
String origname "granule_start_utc";
String fullnamepath "/ancillary_data/granule_start_utc";
}
ancillary_data_start_delta_time {
String units "seconds since 2018-01-01";
String contentType "auxiliaryInformation";
String long_name "ATLAS Start Time (Actual)";
String standard_name "time";
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 source "Derived";
String origname "start_delta_time";
String fullnamepath "/ancillary_data/start_delta_time";
}
ancillary_data_start_geoseg {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Starting Geolocation Segment";
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 source "Derived";
String origname "start_geoseg";
String fullnamepath "/ancillary_data/start_geoseg";
}
ancillary_data_start_orbit {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Starting Orbit Number";
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 source "Derived";
String origname "start_orbit";
String fullnamepath "/ancillary_data/start_orbit";
}
ancillary_data_data_start_utc {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Start UTC Time of Granule (CCSDS-A, Actual)";
String description "UTC (in CCSDS-A format) of the first data point within the granule.";
String source "Derived";
String origname "data_start_utc";
String fullnamepath "/ancillary_data/data_start_utc";
}
ancillary_data_end_gpsweek {
String units "weeks from 1980-01-06";
String contentType "auxiliaryInformation";
String long_name "Ending GPSWeek of Granule (Actual)";
String description "GPS week number of the last data point in the granule.";
String source "Derived";
String origname "end_gpsweek";
String fullnamepath "/ancillary_data/end_gpsweek";
}
ancillary_data_start_rgt {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Starting Reference Groundtrack";
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 source "Derived";
Int32 valid_min 1;
Int32 valid_max 1387;
String origname "start_rgt";
String fullnamepath "/ancillary_data/start_rgt";
}
ancillary_data_end_gpssow {
String units "seconds";
String contentType "auxiliaryInformation";
String long_name "Ending GPS SOW of Granule (Actual)";
String description "GPS seconds-of-week of the last data point in the granule.";
String source "Derived";
String origname "end_gpssow";
String fullnamepath "/ancillary_data/end_gpssow";
}
ancillary_data_land_ice_rbin_width {
String units "meters";
String contentType "auxiliaryInformation";
String long_name "Bin Size";
String description "Residual histogram bin size";
String source "Operations";
String origname "rbin_width";
String fullnamepath "/ancillary_data/land_ice/rbin_width";
}
ancillary_data_land_ice_sigma_beam {
String units "meters";
String contentType "auxiliaryInformation";
String long_name "Sigma of Gaussian Footprint";
String description "Spatial sigma of the Gaussian footprint (m)";
String source "Operations";
String origname "sigma_beam";
String fullnamepath "/ancillary_data/land_ice/sigma_beam";
}
ancillary_data_land_ice_fit_maxiter {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Maximum Iterations of Fit";
String description "Maximum number of iterations in at_seg_fit";
String source "Operations";
String origname "fit_maxiter";
String fullnamepath "/ancillary_data/land_ice/fit_maxiter";
}
ancillary_data_land_ice_n_hist {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Number of Histogram Bins";
String description "Number of bins in a histogram";
String source "Operations";
String origname "n_hist";
String fullnamepath "/ancillary_data/land_ice/n_hist";
}
ancillary_data_land_ice_min_gain_th {
String units "1";
String contentType "auxiliaryInformation";
String description "Minimum estimated gain threshold (3.1.6)";
String source "Operations";
String long_name "Minimum Gain Threshold";
String origname "min_gain_th";
String fullnamepath "/ancillary_data/land_ice/min_gain_th";
}
ancillary_data_land_ice_maxiter {
String units "counts";
String contentType "auxiliaryInformation";
String long_name "Maximum Iterations";
String description "Maximum number of iterations in tx_shape_corr";
String source "Operations";
String origname "maxiter";
String fullnamepath "/ancillary_data/land_ice/maxiter";
}
ancillary_data_land_ice_n_sigmas {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Number of Sigmas";
String description "Multiplied by sigma_expected to get h_win";
String source "Operations";
String origname "n_sigmas";
String fullnamepath "/ancillary_data/land_ice/n_sigmas";
}
ancillary_data_land_ice_dt_hist {
String units "seconds";
String contentType "auxiliaryInformation";
String long_name "Histogram Bin Size";
String description "Bin size for histograms (sec)";
String source "Operations";
String origname "dt_hist";
String fullnamepath "/ancillary_data/land_ice/dt_hist";
}
ancillary_data_land_ice_sigma_tx {
String units "seconds";
String contentType "auxiliaryInformation";
String long_name "Duration of Transmit Pulse";
String description "Temporal duration of the transmit pulse (sec), calculated from the FWHM of the TEP waveform";
String source "Operations";
String origname "sigma_tx";
String fullnamepath "/ancillary_data/land_ice/sigma_tx";
}
ancillary_data_land_ice_min_signal_conf {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Minimum Signal Confidence";
String description "Minimum signal confidence level for a photon to be considered valid.";
String source "Operations";
Int32 valid_min 0;
Int32 valid_max 4;
String origname "min_signal_conf";
String fullnamepath "/ancillary_data/land_ice/min_signal_conf";
}
ancillary_data_land_ice_t_dead {
String units "seconds";
String contentType "auxiliaryInformation";
String long_name "Dead-time";
String description "Dead-time for any channel in the detector (sec)";
String source "Operations";
String origname "t_dead";
String fullnamepath "/ancillary_data/land_ice/t_dead";
}
ancillary_data_land_ice_min_n_sel {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Mininum Number of Photons";
String description "Minimum number of selected PEs in pe_select";
String source "Operations";
String origname "min_n_sel";
String fullnamepath "/ancillary_data/land_ice/min_n_sel";
}
ancillary_data_land_ice_max_res_ids {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Max Segments";
String description "Maximum number of segment ids in each residual_histogram";
String source "Operations";
String origname "max_res_ids";
String fullnamepath "/ancillary_data/land_ice/max_res_ids";
}
ancillary_data_land_ice_proc_interval {
String units "seconds";
String contentType "auxiliaryInformation";
String long_name "Processing Interval";
String description "Processing interval in number of geolocation segments..";
String source "Operations";
String origname "proc_interval";
String fullnamepath "/ancillary_data/land_ice/proc_interval";
}
ancillary_data_land_ice_fpb_maxiter {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Maximum Iterations for FPB";
String description "Maximum number of iterations in fpb_corr";
String source "Operations";
String origname "fpb_maxiter";
String fullnamepath "/ancillary_data/land_ice/fpb_maxiter";
}
ancillary_data_land_ice_min_n_pe {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Minimum Photons";
String description "Minimum # PEs for fit";
String source "Operations";
String origname "min_n_pe";
String fullnamepath "/ancillary_data/land_ice/min_n_pe";
}
ancillary_data_land_ice_win_nsig {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Sigma Est Multiplier";
String description "Multiplied by sigma_est to get dz_ph_win";
String source "Operations";
String origname "win_nsig";
String fullnamepath "/ancillary_data/land_ice/win_nsig";
}
ancillary_data_land_ice_min_dist {
String units "meters";
String contentType "auxiliaryInformation";
String long_name "Minimum Distance";
String description "Min dist between first and last selected PEs";
String source "Operations";
String origname "min_dist";
String fullnamepath "/ancillary_data/land_ice/min_dist";
}
ancillary_data_land_ice_nhist_bins {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Number of Bins";
String description "Number of bins in residual histogram";
String source "Operations";
String origname "nhist_bins";
String fullnamepath "/ancillary_data/land_ice/nhist_bins";
}
ancillary_data_qa_at_interval {
String units "seconds/cell";
String contentType "auxiliaryInformation";
String long_name "QA Along-Track Interval";
String description "Statistics time interval for along-track QA data.";
String source "control";
String origname "qa_at_interval";
String fullnamepath "/ancillary_data/qa_at_interval";
}
ancillary_data_start_region {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Starting Region";
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 source "Derived";
String origname "start_region";
String fullnamepath "/ancillary_data/start_region";
}
ancillary_data_start_gpsweek {
String units "weeks from 1980-01-06";
String contentType "auxiliaryInformation";
String long_name "Start GPSWeek of Granule (Actual)";
String description "GPS week number of the first data point in the granule.";
String source "Derived";
String origname "start_gpsweek";
String fullnamepath "/ancillary_data/start_gpsweek";
}
gt1l_land_ice_segments_delta_time {
String units "seconds since 2018-01-01";
String contentType "referenceInformation";
String long_name "Elapsed GPS seconds";
String standard_name "time";
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 source "section 4.4";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt1l/land_ice_segments/delta_time";
}
gt1l_residual_histogram_delta_time {
String units "seconds since 2018-01-01";
String contentType "referenceInformation";
String long_name "Elapsed GPS seconds";
String standard_name "time";
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 source "section 4.4";
String coordinates "lat_mean lon_mean";
String origname "delta_time";
String fullnamepath "/gt1l/residual_histogram/delta_time";
}
gt1l_residual_histogram_dh {
String units "meters";
String contentType "physicalMeasurement";
String long_name "Height Differences";
String description "Height differences between vertical bin centers and the segment height (heights for the histogram)";
String source "Section 4.11";
String coordinates "delta_time lat_mean lon_mean";
String origname "dh";
String fullnamepath "/gt1l/residual_histogram/dh";
}
gt1l_residual_histogram_ds_segment_id {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Segment ID Index";
String description "Relative index of each segment_id used in the derivation of the histogram.";
String source "Section 4.11";
Int16 valid_min 1;
Int16 valid_max 10;
String origname "ds_segment_id";
String fullnamepath "/gt1l/residual_histogram/ds_segment_id";
}
gt1l_segment_quality_delta_time {
String units "seconds since 2018-01-01";
String contentType "referenceInformation";
String long_name "Elapsed GPS seconds";
String standard_name "time";
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 source "ATL03";
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 units "seconds since 2018-01-01";
String contentType "referenceInformation";
String long_name "Elapsed GPS seconds";
String standard_name "time";
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 source "section 4.4";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt1r/land_ice_segments/delta_time";
}
gt1r_residual_histogram_delta_time {
String units "seconds since 2018-01-01";
String contentType "referenceInformation";
String long_name "Elapsed GPS seconds";
String standard_name "time";
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 source "section 4.4";
String coordinates "lat_mean lon_mean";
String origname "delta_time";
String fullnamepath "/gt1r/residual_histogram/delta_time";
}
gt1r_residual_histogram_dh {
String units "meters";
String contentType "physicalMeasurement";
String long_name "Height Differences";
String description "Height differences between vertical bin centers and the segment height (heights for the histogram)";
String source "Section 4.11";
String coordinates "delta_time lat_mean lon_mean";
String origname "dh";
String fullnamepath "/gt1r/residual_histogram/dh";
}
gt1r_residual_histogram_ds_segment_id {
String units "1";
String contentType "auxiliaryInformation";
String long_name "Segment ID Index";
String description "Relative index of each segment_id used in the derivation of the histogram.";
String source "Section 4.11";
Int16 valid_min 1;
Int16 valid_max 10;
String origname "ds_segment_id";
String fullnamepath "/gt1r/residual_histogram/ds_segment_id";
}
gt1r_segment_quality_delta_time {
String units "seconds since 2018-01-01";
String contentType "referenceInformation";
String long_name "Elapsed GPS seconds";
String standard_name "time";
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 source "ATL03";
String coordinates "reference_pt_lat reference_pt_lon";
String origname "delta_time";
String fullnamepath "/gt1r/segment_quality/delta_time";
}
orbit_info_crossing_time {
String units "seconds since 2018-01-01";
String contentType "referenceInformation";
String long_name "Ascending Node Crossing Time";
String standard_name "time";
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 source "POD/PPD";
String origname "crossing_time";
String fullnamepath "/orbit_info/crossing_time";
}
orbit_info_sc_orient_time {
String units "seconds since 2018-01-01";
String contentType "referenceInformation";
String long_name "Time of Last Spacecraft Orientation Change";
String standard_name "time";
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 source "POD/PPD";
String origname "sc_orient_time";
String fullnamepath "/orbit_info/sc_orient_time";
}
quality_assessment_gt1l_delta_time {
String units "seconds since 2018-01-01";
String contentType "referenceInformation";
String long_name "Elapsed GPS seconds";
String standard_name "time";
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 source "ATL03";
String coordinates "lat_mean lon_mean";
String origname "delta_time";
String fullnamepath "/quality_assessment/gt1l/delta_time";
}
quality_assessment_gt1r_delta_time {
String units "seconds since 2018-01-01";
String contentType "referenceInformation";
String long_name "Elapsed GPS seconds";
String standard_name "time";
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 source "ATL03";
String coordinates "lat_mean lon_mean";
String origname "delta_time";
String fullnamepath "/quality_assessment/gt1r/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", "orbit_info_crossing_time", "orbit_info_sc_orient_time", "quality_assessment_gt1l_delta_time", "quality_assessment_gt1r_delta_time";
}
}