Attributes {
HDF5_GLOBAL {
String short_name "ATL10";
String level "L3A";
String title "SET_BY_META";
String description "This data set (ATL10) contains along-track estimates of sea ice freeboard using height and surface type information from ATL07. Key metrics from ATL07 are passed through also.";
String Conventions "CF-1.6";
String contributor_name "Ron Kwok (rkwok01@uw.edu), Alek Petty (alek.a.petty@nasa.gov), Jesse Wimert (jeses.wimert@us.kbr.com, Marco Bagnardi (marco.bagnardi@nasa.gov), Glenn Cunninghan, David W Hancock III (david.w.hancock@nasa.gov), Jeff Lee (jeffery.e.lee@nasa.gov), Alvaro Ivanoff (alvaro.ivanoff-1@nasa.gov), Thomas E Neumann (thomas.neumann@nasa.gov), Thorsten Markus (thorsten.markus@nasa.gov), Nathan Kurtz (nathan.t.kurtz@nasa.gov)";
String contributor_role "Data Product Lead, Data Product Lead, Software Engineer, Data Analysis, Data Analysis, Software Engineer, Software Engineer, Software Engineer, Mission Scienist, Mission Scientist, Deputy Mission Scientist";
String date_type "UTC";
String featureType "trajectory";
String geospatial_lat_units "degrees_north";
String geospatial_lon_units "degrees_east";
String granule_type "ATL10";
String identifier_product_doi_authority "http://dx.doi.org";
String license "Data may not be reproduced or distributed without including the citation for this product included in this metadata. Data may not be distributed in an altered form without the written permission of the ICESat-2 Science Project Office at NASA/GSFC.";
String naming_authority "http://dx.doi.org";
String spatial_coverage_type "Horizontal";
String standard_name_vocabulary "CF-1.6";
String time_type "CCSDS UTC-A";
String date_created "2023-06-12T20:33:05.000000Z";
String hdfversion "HDF5 1.10.7";
String history "2023-06-12T20:33:05.000000Z;84de9986-43f1-3435-bdd4-c5fc09522231;Created by PGE atlas_l3a_fb Version 4.0.1";
String identifier_file_uuid "84de9986-43f1-3435-bdd4-c5fc09522231";
String identifier_product_format_version "4.0";
Float64 time_coverage_duration 5658.0000000000000;
String time_coverage_end "2018-12-27T23:25:31.000000Z";
String time_coverage_start "2018-12-27T21:51:13.000000Z";
Float64 geospatial_lat_min -76.102377855740599;
Float64 geospatial_lon_min -161.33701781951714;
Float64 geospatial_lat_max -67.795504075383789;
Float64 geospatial_lon_max 11.356735485117710;
String publisher_name "NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center";
String publisher_email "nsidc@nsidc.org";
String publisher_url "http://nsidc.org/daac/";
String identifier_product_type "ATL10";
String identifier_product_doi "doi:10.5067/ATLAS/ATL10.006";
String institution "National Aeronautics and Space Administration (NASA)";
String creator_name "GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System";
String summary "The purpose of ATL10 is to provide along-track freeboard estimates and associated statistics.";
String keywords "EARTH SCIENCE > SPECTRAL/ENGINEERING > LIDAR > LIDAR BACKSCATTER > 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 "2A";
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 orbit information.";
String data_rate "Varies. Data are only provided when one of the stored values (besides time) changes.";
String fullnamepath "/orbit_info";
}
METADATA {
String Description "ISO19115 Structured Metadata Represented within HDF5";
String iso_19139_dataset_xml "
ATL10-02_20181227215113_13790101_006_02.h5
NSIDC DAAC > National Snow and Ice Data Center DAAC
nsidc@nsidc.org
http://nsidc.org/daac/
pointOfContact
2023-06-12T20:33:05.000000Z
ISO 19115-2 Geographic information - Metadata - Part 2: Extensions for imagery and gridded data
ISO 19115-2:2009-02-15
ATL10-02_20181227215113_13790101_006_02.h5
2023-06-12T20:33:05.000000Z
creation
ATL10
The ECS Short Name
006
The ECS Version ID
ATL10-02_20181227215113_13790101_006_02.h5
ProducerGranuleId
The ICESat-2 ATL10 standard data product contains estimates of freeboard using sea ice elevations and available sea surface height within km length scale It also contains statistics of sea surface samples used in the estimates.
onGoing
ATL10
006
largerWorkCitation
eng
geoscientificInformation
AscendingCrossing: -147.55325193334264 StartLatitude: -27.000000000000000 StartDirection:D EndLatitude: -27.000000000000000 EndDirection: A
gov.nasa.esdis.umm.orbitparameters
OrbitParameters
OrbitNumber: 1580 EquatorCrossingLongitude: -147.55325193334264 EquatorCrossingDateTime: 2018-12-27T21:51:14.515032Z
gov.nasa.esdis.umm.orbitcalculatedspatialdomains
OrbitCalculatedSpatialDomains
2018-12-27T22:56:04.995051Z
2018-12-27T23:07:21.810646Z
dataset
2023-06-12T20:33:05.000000Z;84de9986-43f1-3435-bdd4-c5fc09522231;Created by PGE atlas_l3a_fb Version 4.0.1
2023-06-12T20:33:05.000000Z
";
String iso_19139_series_xml "
ATL10.006
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 L2A Normalized Relative Backscatter Profiles
2022-08-09
revision
006
ATL10
The ECS Short Name
006
The ECS Version ID
doi:10.5067/ATLAS/ATL10.006
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
The ICESat-2 ATL10 standard data product contains estimates of freeboard using sea ice elevations and available sea surface height within km length scale It also contains statistics of sea surface samples used in the estimates.
The purpose of ATL10 is to provide along-track freeboard estimates and associated statistics.
The software that generates the ATL10 product was designed and implemented within the ICESat-2 Science Investigator-led Processing System at the NASA Goddard Space Flight Center in Greenbelt, Maryland.
onGoing
NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center
distributor
HDF
5
EARTH SCIENCE > SPECTRAL/ENGINEERING > LIDAR > LIDAR BACKSCATTER > 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: 1.0 StartCircularLatitude: 0.0
gov.nasa.esdis.umm.orbitparameters
OrbitParameters
2005-01-01T00:00:00Z
2A
2A
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
https://doi.org/10.5067/ATLAS/ATL10.006
http
Digital Object Identifier URL
information
ATLAS > Advanced Topographic Laser Altimeter System
ATLAS
Advanced Topographic Laser Altimeter System
Laser Altimeter
ATLAS on ICESat-2 determines the range between the satellite and the Earth's surface by measuring the two-way time delay of short pulses of laser light that it transmits in six beams. It is different from previous operational ice-sheet altimeters in that it is a photon-counting LIDAR. ATLAS records a set of arrival times for individual photons, which are then analyzed to derive surface, vegetation, and cloud properties. ATLAS has six beams arranged in three pairs, so that it samples each of three reference pair tracks with a pair of beams; ATLAS transmits pulses at 10 kHz, giving approximately one pulse every 0.7 m along track; ATLAS's expected pointing control will be better than 90 m RMS.
ICESat-2 > Ice, Cloud, and land Elevation Satellite-2
ICESat-2 > Ice, Cloud, and land Elevation Satellite-2
ICESat-2
Ice, Cloud, and land Elevation Satellite-2
underDevelopment
ICESat-2 > Ice, Cloud, and land Elevation Satellite-2
ICESat-2
Ice, Cloud, and land Elevation Satellite-2
Spacecraft
";
String fullnamepath "/METADATA";
}
METADATA_AcquisitionInformation {
}
METADATA_AcquisitionInformation_lidar {
String pulse_rate "10000 pps";
String wavelength "532 nm";
String identifier "ATLAS";
String type "Laser Altimeter";
String description "ATLAS on ICESat-2 determines the range between the satellite and the Earth's surface by measuring the two-way time delay of short pulses of laser light that it transmits in six beams. It is different from previous operational ice-sheet altimeters in that it is a photon-counting LIDAR. ATLAS records a set of arrival times for individual photons, which are then analyzed to derive surface, vegetation, and cloud properties. ATLAS has six beams arranged in three pairs, so that it samples each of three reference pair tracks with a pair of beams; ATLAS transmits pulses at 10 kHz, giving approximately one pulse every 0.7 m along track; ATLAS's expected pointing control will be better than 90 m RMS.";
String fullnamepath "/METADATA/AcquisitionInformation/lidar";
}
METADATA_AcquisitionInformation_lidarDocument {
String edition "Pre-Release";
String publicationDate "12/31/17";
String title "A document describing the ATLAS instrument will be provided by the ICESat-2 Project Science Office.";
String fullnamepath "/METADATA/AcquisitionInformation/lidarDocument";
}
METADATA_AcquisitionInformation_platform {
String identifier "ICESat-2";
String description "Ice, Cloud, and land Elevation Satellite-2";
String type "Spacecraft";
String fullnamepath "/METADATA/AcquisitionInformation/platform";
}
METADATA_AcquisitionInformation_platformDocument {
String edition "31-Dec-16";
String publicationDate "31-Dec-16";
String title "The Ice, Cloud, and land Elevation Satellite-2 (ICESat-2): Science requirements, concept, and implementation. Thorsten Markus, Tom Neumann, Anthony Martino, Waleed Abdalati, Kelly Brunt, Beata Csatho, Sinead Farrell, Helen Fricker, Alex Gardner, David Harding, Michael Jasinski, Ron Kwok, Lori Magruder, Dan Lubin, Scott Luthcke, James Morison, Ross Nelson, Amy Neuenschwander, Stephen Palm, Sorin Popescu, CK Shum, Bob E. Schutz, Benjamin Smith, Yuekui Yang, Jay Zwally. http://dx.doi.org/10.1016/j.rse.2016.12.029";
String fullnamepath "/METADATA/AcquisitionInformation/platformDocument";
}
METADATA_DataQuality {
String scope "NOT_SET";
String fullnamepath "/METADATA/DataQuality";
}
METADATA_DataQuality_CompletenessOmission {
String evaluationMethodType "directInternal";
String measureDescription "TBD";
String nameOfMeasure "TBD";
String unitofMeasure "TBD";
String value "NOT_SET";
String fullnamepath "/METADATA/DataQuality/CompletenessOmission";
}
METADATA_DataQuality_DomainConsistency {
String evaluationMethodType "directInternal";
String measureDescription "TBD";
String nameOfMeasure "TBD";
String unitofMeasure "TBD";
String value "NOT_SET";
String fullnamepath "/METADATA/DataQuality/DomainConsistency";
}
METADATA_ProductSpecificationDocument {
String ShortName "ATL10_SDP";
String characterSet "utf8";
String edition "v4.3";
String language "eng";
String publicationDate "Feb 2020";
String title "ICESat-2-SIPS-SPEC-4207 - ATLAS Science Algorithm Standard Data Product (SDP) Volume 12 (ATL10). Revision -.";
String fullnamepath "/METADATA/ProductSpecificationDocument";
}
METADATA_SeriesIdentification {
String maintenanceAndUpdateFrequency "asNeeded";
String maintenanceDate "SET_BY_META";
String VersionID "006";
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 L2A Normalized Relative Backscatter Profiles";
String shortName "ATL10";
String identifier_product_DOI "doi:10.5067/ATLAS/ATL10.006";
String revisionDate "2022-08-09";
String resourceProviderOrganizationName "National Aeronautics and Space Administration (NASA)";
String abstract "The ICESat-2 ATL10 standard data product contains estimates of freeboard using sea ice elevations and available sea surface height within km length scale It also contains statistics of sea surface samples used in the estimates.";
String purpose "The purpose of ATL10 is to provide along-track freeboard estimates and associated statistics.";
String credit "The software that generates the ATL10 product was designed and implemented within the ICESat-2 Science Investigator-led Processing System at the NASA Goddard Space Flight Center in Greenbelt, Maryland.";
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 "2023-06-12T20:33:05.000000Z";
String uuid "84de9986-43f1-3435-bdd4-c5fc09522231";
String fileName "ATL10-02_20181227215113_13790101_006_02.h5";
String VersionID "006";
String language "eng";
String characterSet "utf8";
String shortName "ATL10";
String originatorOrganizationName "GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System";
String abstract "The ICESat-2 ATL10 standard data product contains estimates of freeboard using sea ice elevations and available sea surface height within km length scale It also contains statistics of sea surface samples used in the estimates.";
String purpose "The purpose of ATL10 is to provide along-track freeboard estimates and associated statistics.";
String credit "The software that generates the ATL10 product was designed and implemented within the ICESat-2 Science Investigator-led Processing System at the NASA Goddard Space Flight Center in Greenbelt, Maryland.";
String status "onGoing";
String topicCategory "geoscientificInformation";
String fullnamepath "/METADATA/DatasetIdentification";
}
METADATA_Extent {
Float64 northBoundLatitude -67.795504075383789;
Float64 eastBoundLongitude 11.356735485117710;
Float64 southBoundLatitude -76.102377855740599;
Float64 westBoundLongitude -161.33701781951714;
String rangeBeginningDateTime "2018-12-27T22:56:04.995051Z";
String rangeEndingDateTime "2018-12-27T23:07:21.810646Z";
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 "2023-06-12T20:33:08.000000Z";
String fileName "ATL10-02_20181227215113_13790101_006_02.qa";
String fullnamepath "/METADATA/QADatasetIdentification";
}
METADATA_Lineage {
}
METADATA_Lineage_ANC25_10 {
String description "HDF5 template file that defines the organization and default content of the product.";
String fileName "ANC25-10_20221024172450_040_01.h5";
String shortName "ANC25-10";
String uuid "dd21a70e-4eea-3bba-94e8-e36f9b936d32";
String version "040";
String fullnamepath "/METADATA/Lineage/ANC25-10";
}
METADATA_Lineage_ANC26_10 {
String description "HDF5 template file that defines the organization and default content of the product metadata.";
String fileName "ANC26-10_20221024172450_040_01.h5";
String shortName "ANC26-10";
String uuid "b13a59fc-d6f3-3165-996d-6adf64f613ed";
String version "040";
String fullnamepath "/METADATA/Lineage/ANC26-10";
}
METADATA_Lineage_ANC36_10 {
String description "ISO 19139 XML file containing Series-level metadata information.";
String fileName "ANC36-10_20221024174747_006_01.xml";
String shortName "ANC36-10";
String uuid "d3bef40f-7f51-3d00-a85a-ac5a1822c632";
String version "006";
String fullnamepath "/METADATA/Lineage/ANC36-10";
}
METADATA_Lineage_ANC38_10 {
String description "ISO 19139 XML file containing DataSet-level metadata information.";
String fileName "ANC38-10_20221024174748_006_01.xml";
String shortName "ANC38-10";
String uuid "fedf4188-d6f8-3fa4-9a38-5bd3317b81c6";
String version "006";
String fullnamepath "/METADATA/Lineage/ANC38-10";
}
METADATA_Lineage_ANC35 {
String description "Distance-to-land map provided by the Sea Ice ATBD lead";
String fileName "distmap_ssmi_antarc_2km_20190227_01.dat";
String shortName "ANC35";
String uuid "680ca8f4-7498-33c8-b97f-d6ceb3fd9c0a";
String version "20190227";
String fullnamepath "/METADATA/Lineage/ANC35";
}
METADATA_Lineage_ATL07 {
String description "ATLAS/ICESat-2 L3A Sea Ice Height";
String fileName "ATL07-02_20181227215113_13790101_006_02.h5";
String shortName "ATL07";
String uuid "172d4fe4-8bab-3bc1-801e-b5c2d2df02d5";
String version "006";
Int32 start_cycle 1;
Int32 end_cycle 1;
Int32 start_orbit 1580;
Int32 end_orbit 1580;
Int32 start_rgt 1379;
Int32 end_rgt 1379;
Int32 start_region 2;
Int32 end_region 2;
Int32 start_geoseg 1380131;
Int32 end_geoseg 1620219;
String fullnamepath "/METADATA/Lineage/ATL07";
}
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_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_fb_013935178.ctl";
String shortName "CNTL";
String version "1";
String fullnamepath "/METADATA/Lineage/Control";
}
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 3.0";
String softwareDate "Sep 21 2022";
String softwareTitle "Creates ATLAS HDF5 browse files";
String runTimeParameters "CTL_atlas_l3a_fb_013935178.ctl";
String stepDateTime "2023-06-12T20:33:10.000000Z";
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 5.0";
String softwareDate "Sep 21 2022";
String softwareTitle "Creates ATLAS XML metadata files";
String runTimeParameters "CTL_atlas_l3a_fb_013935178.ctl";
String stepDateTime "2023-06-12T20:33:18.000000Z";
String fullnamepath "/METADATA/ProcessStep/Metadata";
}
METADATA_ProcessStep_PGE {
String ATBDDate "12/04/2019";
String ATBDTitle "Algorithm Theoretical Basis Document (ATBD) For Sea Ice Products";
String ATBDVersion "N/A";
String documentDate "Feb 2020";
String documentation "ATLAS Science Algorithm Software Design Description (SDD) - Volume 22 (atlas_l3a_fb)";
String processDescription "Computes estimates of freeboard using sea ice heights and available sea surface heights within at km length scale; contains statistics of sea surface samples used in the estimates.";
String identifier "atlas_l3a_fb";
String softwareVersion "Version 4.0.1";
String softwareDate "Mar 29 2023";
String softwareTitle "ASAS L3A Sea Ice Freeboard PGE";
String runTimeParameters "CTL_atlas_l3a_fb_013935178.ctl";
String stepDateTime "2023-06-12T20:33:05.000000Z";
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 "atl10_qa_util";
String softwareVersion "Version 4.0";
String softwareDate "Sep 21 2022";
String softwareTitle "ATL10 QA Utility";
String runTimeParameters "CTL_atlas_l3a_fb_013935178.ctl";
String stepDateTime "2023-06-12T20:33:08.000000Z";
String fullnamepath "/METADATA/ProcessStep/QA";
}
gt1r {
String Description "Each group contains data for each of the six ATLAS beams. As ICESat-2 orbits the earth, sequential transmit pulses illuminate six ground tracks on the surface of the earth. The track width is approximately 10m wide. Each ground track is numbered, according to the laser spot number that generates a given ground track. Ground tracks from the strong beams are therefore numbered 1, 3 and 5; ground tracks from the weak beams are numbered 2, 4 and 6. See ICESat-2 L2A ATBD.";
String atlas_pce "pce3";
String atlas_beam_type "strong";
String groundtrack_id "gt1r";
String atmosphere_profile "profile_1";
String atlas_spot_number "5";
String sc_orientation "Forward";
String fullnamepath "/gt1r";
}
gt1r_freeboard_segment {
String Description "Contains freeboard estimate and associated parameters computed by its beam reference surface section.";
String data_rate "Data within this group are stored at the variable individual height/freeboard segment rate";
String fullnamepath "/gt1r/freeboard_segment";
}
gt1r_freeboard_segment_heights {
String Description "Contains key height segment parameters from ATL07 associated with the freeboard estimates, at the segment scale";
String fullnamepath "/gt1r/freeboard_segment/heights";
}
gt1r_freeboard_segment_geophysical {
String Description "Contains geophysical parameters from ATL07 associated with the freeboard estimate, at the segment scale";
String fullnamepath "/gt1r/freeboard_segment/geophysical";
}
gt1r_reference_surface_section {
String Description "Contains reference sea surface and mean freeboard parameters by each beam.";
String data_rate "Data within this group are stored at the reference surface section rate";
String fullnamepath "/gt1r/reference_surface_section";
}
gt1r_leads {
String Description "Contains parameters relating to the determination of open water leads and the reference surface heights";
String data_rate "Data within this group are stored at the lead index rate.";
String fullnamepath "/gt1r/leads";
}
gt2r {
String Description "Each group contains data for each of the six ATLAS beams. As ICESat-2 orbits the earth, sequential transmit pulses illuminate six ground tracks on the surface of the earth. The track width is approximately 10m wide. Each ground track is numbered, according to the laser spot number that generates a given ground track. Ground tracks from the strong beams are therefore numbered 1, 3 and 5; ground tracks from the weak beams are numbered 2, 4 and 6. See ICESat-2 L2A ATBD.";
String atlas_pce "pce2";
String atlas_beam_type "strong";
String groundtrack_id "gt2r";
String atmosphere_profile "profile_2";
String atlas_spot_number "3";
String sc_orientation "Forward";
String fullnamepath "/gt2r";
}
gt2r_freeboard_segment {
String Description "Contains freeboard estimate and associated parameters computed by its beam reference surface section.";
String data_rate "Data within this group are stored at the variable individual height/freeboard segment rate";
String fullnamepath "/gt2r/freeboard_segment";
}
gt2r_freeboard_segment_heights {
String Description "Contains key height segment parameters from ATL07 associated with the freeboard estimates, at the segment scale";
String fullnamepath "/gt2r/freeboard_segment/heights";
}
gt2r_freeboard_segment_geophysical {
String Description "Contains geophysical parameters from ATL07 associated with the freeboard estimate, at the segment scale";
String fullnamepath "/gt2r/freeboard_segment/geophysical";
}
gt2r_reference_surface_section {
String Description "Contains reference sea surface and mean freeboard parameters by each beam.";
String data_rate "Data within this group are stored at the reference surface section rate";
String fullnamepath "/gt2r/reference_surface_section";
}
gt2r_leads {
String Description "Contains parameters relating to the determination of open water leads and the reference surface heights";
String data_rate "Data within this group are stored at the lead index rate.";
String fullnamepath "/gt2r/leads";
}
gt1l {
String Description "Each group contains data for each of the six ATLAS beams. As ICESat-2 orbits the earth, sequential transmit pulses illuminate six ground tracks on the surface of the earth. The track width is approximately 10m wide. Each ground track is numbered, according to the laser spot number that generates a given ground track. Ground tracks from the strong beams are therefore numbered 1, 3 and 5; ground tracks from the weak beams are numbered 2, 4 and 6. See ICESat-2 L2A ATBD.";
String atlas_pce "pce3";
String atlas_beam_type "weak";
String groundtrack_id "gt1l";
String atmosphere_profile "profile_1";
String atlas_spot_number "6";
String sc_orientation "Forward";
String fullnamepath "/gt1l";
}
gt1l_freeboard_segment {
String Description "Contains freeboard estimate and associated parameters computed by its beam reference surface section.";
String data_rate "Data within this group are stored at the variable individual height/freeboard segment rate";
String fullnamepath "/gt1l/freeboard_segment";
}
gt1l_freeboard_segment_heights {
String Description "Contains key height segment parameters from ATL07 associated with the freeboard estimates, at the segment scale";
String fullnamepath "/gt1l/freeboard_segment/heights";
}
gt1l_freeboard_segment_geophysical {
String Description "Contains geophysical parameters from ATL07 associated with the freeboard estimate, at the segment scale";
String fullnamepath "/gt1l/freeboard_segment/geophysical";
}
gt1l_reference_surface_section {
String Description "Contains reference sea surface and mean freeboard parameters by each beam.";
String data_rate "Data within this group are stored at the reference surface section rate";
String fullnamepath "/gt1l/reference_surface_section";
}
gt1l_leads {
String Description "Contains parameters relating to the determination of open water leads and the reference surface heights";
String data_rate "Data within this group are stored at the lead index rate.";
String fullnamepath "/gt1l/leads";
}
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";
}
gt3l {
String Description "Each group contains data for each of the six ATLAS beams. As ICESat-2 orbits the earth, sequential transmit pulses illuminate six ground tracks on the surface of the earth. The track width is approximately 10m wide. Each ground track is numbered, according to the laser spot number that generates a given ground track. Ground tracks from the strong beams are therefore numbered 1, 3 and 5; ground tracks from the weak beams are numbered 2, 4 and 6. See ICESat-2 L2A ATBD.";
String atlas_pce "pce1";
String atlas_beam_type "weak";
String groundtrack_id "gt3l";
String atmosphere_profile "profile_3";
String atlas_spot_number "2";
String sc_orientation "Forward";
String fullnamepath "/gt3l";
}
gt3l_freeboard_segment {
String Description "Contains freeboard estimate and associated parameters computed by its beam reference surface section.";
String data_rate "Data within this group are stored at the variable individual height/freeboard segment rate";
String fullnamepath "/gt3l/freeboard_segment";
}
gt3l_freeboard_segment_heights {
String Description "Contains key height segment parameters from ATL07 associated with the freeboard estimates, at the segment scale";
String fullnamepath "/gt3l/freeboard_segment/heights";
}
gt3l_freeboard_segment_geophysical {
String Description "Contains geophysical parameters from ATL07 associated with the freeboard estimate, at the segment scale";
String fullnamepath "/gt3l/freeboard_segment/geophysical";
}
gt3l_reference_surface_section {
String Description "Contains reference sea surface and mean freeboard parameters by each beam.";
String data_rate "Data within this group are stored at the reference surface section rate";
String fullnamepath "/gt3l/reference_surface_section";
}
gt3l_leads {
String Description "Contains parameters relating to the determination of open water leads and the reference surface heights";
String data_rate "Data within this group are stored at the lead index rate.";
String fullnamepath "/gt3l/leads";
}
gt2l {
String Description "Each group contains data for each of the six ATLAS beams. As ICESat-2 orbits the earth, sequential transmit pulses illuminate six ground tracks on the surface of the earth. The track width is approximately 10m wide. Each ground track is numbered, according to the laser spot number that generates a given ground track. Ground tracks from the strong beams are therefore numbered 1, 3 and 5; ground tracks from the weak beams are numbered 2, 4 and 6. See ICESat-2 L2A ATBD.";
String atlas_pce "pce2";
String atlas_beam_type "weak";
String groundtrack_id "gt2l";
String atmosphere_profile "profile_2";
String atlas_spot_number "4";
String sc_orientation "Forward";
String fullnamepath "/gt2l";
}
gt2l_freeboard_segment {
String Description "Contains freeboard estimate and associated parameters computed by its beam reference surface section.";
String data_rate "Data within this group are stored at the variable individual height/freeboard segment rate";
String fullnamepath "/gt2l/freeboard_segment";
}
gt2l_freeboard_segment_heights {
String Description "Contains key height segment parameters from ATL07 associated with the freeboard estimates, at the segment scale";
String fullnamepath "/gt2l/freeboard_segment/heights";
}
gt2l_freeboard_segment_geophysical {
String Description "Contains geophysical parameters from ATL07 associated with the freeboard estimate, at the segment scale";
String fullnamepath "/gt2l/freeboard_segment/geophysical";
}
gt2l_reference_surface_section {
String Description "Contains reference sea surface and mean freeboard parameters by each beam.";
String data_rate "Data within this group are stored at the reference surface section rate";
String fullnamepath "/gt2l/reference_surface_section";
}
gt2l_leads {
String Description "Contains parameters relating to the determination of open water leads and the reference surface heights";
String data_rate "Data within this group are stored at the lead index rate.";
String fullnamepath "/gt2l/leads";
}
ancillary_data {
String Description "Contains information ancillary to the data product. This may include product characteristics, instrument characteristics and/or processing constants.";
String fullnamepath "/ancillary_data";
}
ancillary_data_freeboard_estimation {
String Description "Contains ancillary parameters related to the surface classification algorithm.";
String fullnamepath "/ancillary_data/freeboard_estimation";
}
gt3r {
String Description "Each group contains data for each of the six ATLAS beams. As ICESat-2 orbits the earth, sequential transmit pulses illuminate six ground tracks on the surface of the earth. The track width is approximately 10m wide. Each ground track is numbered, according to the laser spot number that generates a given ground track. Ground tracks from the strong beams are therefore numbered 1, 3 and 5; ground tracks from the weak beams are numbered 2, 4 and 6. See ICESat-2 L2A ATBD.";
String atlas_pce "pce1";
String atlas_beam_type "strong";
String groundtrack_id "gt3r";
String atmosphere_profile "profile_3";
String atlas_spot_number "1";
String sc_orientation "Forward";
String fullnamepath "/gt3r";
}
gt3r_freeboard_segment {
String Description "Contains freeboard estimate and associated parameters computed by its beam reference surface section.";
String data_rate "Data within this group are stored at the variable individual height/freeboard segment rate";
String fullnamepath "/gt3r/freeboard_segment";
}
gt3r_freeboard_segment_heights {
String Description "Contains key height segment parameters from ATL07 associated with the freeboard estimates, at the segment scale";
String fullnamepath "/gt3r/freeboard_segment/heights";
}
gt3r_freeboard_segment_geophysical {
String Description "Contains geophysical parameters from ATL07 associated with the freeboard estimate, at the segment scale";
String fullnamepath "/gt3r/freeboard_segment/geophysical";
}
gt3r_reference_surface_section {
String Description "Contains reference sea surface and mean freeboard parameters by each beam.";
String data_rate "Data within this group are stored at the reference surface section rate";
String fullnamepath "/gt3r/reference_surface_section";
}
gt3r_leads {
String Description "Contains parameters relating to the determination of open water leads and the reference surface heights";
String data_rate "Data within this group are stored at the lead index rate.";
String fullnamepath "/gt3r/leads";
}
orbit_info_cycle_number {
String long_name "Cycle Number";
String units "1";
String source "Operations";
Int16 valid_min 0;
Int16 valid_max 50;
String contentType "referenceInformation";
String description "A count of the number of exact repeats of this reference orbit.";
String origname "cycle_number";
String fullnamepath "/orbit_info/cycle_number";
String coordinates "orbit_info_crossing_time";
}
orbit_info_orbit_number {
String long_name "Orbit Number";
String units "1";
String source "Operations";
UInt16 valid_min 1;
UInt16 valid_max 65000;
String contentType "referenceInformation";
String description "Unique identifying number for each planned ICESat-2 orbit.";
String origname "orbit_number";
String fullnamepath "/orbit_info/orbit_number";
String coordinates "orbit_info_crossing_time";
}
orbit_info_lan {
String long_name "Ascending Node Longitude";
String units "degrees_east";
String source "POD/PPD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude at the ascending node crossing.";
String origname "lan";
String fullnamepath "/orbit_info/lan";
String coordinates "orbit_info_crossing_time";
}
orbit_info_sc_orient {
String long_name "Spacecraft Orientation";
String units "1";
String source "POD/PPD";
Int16 valid_min 0;
Int16 valid_max 2;
String contentType "referenceInformation";
String description "This parameter tracks the spacecraft orientation between forward, backward and transitional flight modes. ICESat-2 is considered to be flying forward when the weak beams are leading the strong beams; and backward when the strong beams are leading the weak beams. ICESat-2 is considered to be in transition while it is maneuvering between the two orientations. Science quality is potentially degraded while in transition mode.";
String flag_meanings "backward forward transition";
Int16 flag_values 0, 1, 2;
String origname "sc_orient";
String fullnamepath "/orbit_info/sc_orient";
String coordinates "orbit_info_sc_orient_time";
}
orbit_info_rgt {
String long_name "Reference Ground track";
String units "1";
String source "POD/PPD";
Int16 valid_min 1;
Int16 valid_max 1387;
String contentType "referenceInformation";
String description "The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs.";
String origname "rgt";
String fullnamepath "/orbit_info/rgt";
String coordinates "orbit_info_crossing_time";
}
gt1r_freeboard_segment_heights_msw_flag {
String long_name "multiple scattering warning flag";
String units "1";
String source "ATL09";
Int16 valid_min -1;
Int16 valid_max 5;
String contentType "modelResult";
String description "Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight.";
String flag_meanings "cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5";
Int16 flag_values -1, 0, 1, 2, 3, 4, 5;
String origname "msw_flag";
String fullnamepath "/gt1r/freeboard_segment/heights/msw_flag";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_cloud_flag_atm {
String long_name "cloud flag atm";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 10;
String contentType "modelResult";
String description "Number of layers found from the backscatter profile using the DDA layer finder";
String origname "cloud_flag_atm";
String fullnamepath "/gt1r/freeboard_segment/heights/cloud_flag_atm";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_height_segment_length_seg {
Float32 _FillValue 3.402823466e+38;
String long_name "length of segment";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Along-track length of segment containing n_photons_actual (ATL07 length_seg)";
String origname "height_segment_length_seg";
String fullnamepath "/gt1r/freeboard_segment/heights/height_segment_length_seg";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_bsnow_con {
Float32 _FillValue 3.402823466e+38;
String long_name "Blowing snow confidence";
String units "1";
String source "ATL09";
String contentType "modelResult";
String description "Blowing snow confidence";
String origname "bsnow_con";
String fullnamepath "/gt1r/freeboard_segment/heights/bsnow_con";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_layer_flag {
String long_name "consolidated cloud flag";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 1;
String contentType "modelResult";
String description "This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow.";
String flag_meanings "likely_clear likely_cloudy";
Int16 flag_values 0, 1;
String origname "layer_flag";
String fullnamepath "/gt1r/freeboard_segment/heights/layer_flag";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_backgr_calc {
Float32 _FillValue 3.402823466e+38;
String long_name "background count rate calculated";
String units "hz";
String source "ATL07";
String contentType "modelResult";
String description "Calculated background count rate based on sun angle, surface slope, unit reflectance";
String origname "backgr_calc";
String fullnamepath "/gt1r/freeboard_segment/heights/backgr_calc";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_ice_conc_amsr2 {
Float32 _FillValue 3.402823466e+38;
String long_name "sea ice concentration from AMSR2 file";
String units "1";
String source "ATL07/ANC31";
String contentType "modelResult";
String description "Sea ice concentration from daily AMSR2 sea ice concentration file (ANC49)";
String origname "ice_conc_amsr2";
String fullnamepath "/gt1r/freeboard_segment/heights/ice_conc_amsr2";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_bsnow_h {
Float32 _FillValue 3.402823466e+38;
String long_name "Blowing snow top height";
String units "meters";
String source "ATL09";
String contentType "modelResult";
String description "Blowing snow layer top height";
String origname "bsnow_h";
String fullnamepath "/gt1r/freeboard_segment/heights/bsnow_h";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+, Lon of segment center";
String origname "longitude";
String fullnamepath "/gt1r/freeboard_segment/heights/longitude";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude";
}
gt1r_freeboard_segment_heights_height_segment_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "h surface sigma";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Sigma height surface error estimate - width of the trimmed histogram divided by the number of photons.";
String origname "height_segment_sigma";
String fullnamepath "/gt1r/freeboard_segment/heights/height_segment_sigma";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_background_r_norm {
Float32 _FillValue 3.402823466e+38;
String long_name "normalized background (50 shot)";
String units "hz";
String source "ATL07";
String contentType "modelResult";
String description "Background rate normalized to a fixed solar elevation angle";
String origname "background_r_norm";
String fullnamepath "/gt1r/freeboard_segment/heights/background_r_norm";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of segment center";
String origname "latitude";
String fullnamepath "/gt1r/freeboard_segment/heights/latitude";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_height_segment_ocdepth {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment ocean depth";
String standard_name "ocdepth";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Height segment ocean depth";
String origname "height_segment_ocdepth";
String fullnamepath "/gt1r/freeboard_segment/heights/height_segment_ocdepth";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_height_segment_dist2land {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment distance to land";
String standard_name "dist2land";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Height segment distance to land";
String origname "height_segment_dist2land";
String fullnamepath "/gt1r/freeboard_segment/heights/height_segment_dist2land";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_cloud_flag_asr {
String long_name "cloud flag asr";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 5;
String contentType "modelResult";
String description "Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence";
String flag_meanings "clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence";
Int16 flag_values 0, 1, 2, 3, 4, 5;
String origname "cloud_flag_asr";
String fullnamepath "/gt1r/freeboard_segment/heights/cloud_flag_asr";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_ice_conc_ssmi {
Float32 _FillValue 3.402823466e+38;
String long_name "sea ice concentration";
String units "1";
String source "ATL07/ANC31";
String contentType "modelResult";
String description "Sea ice concentration from daily SSMI sea ice concentration file (ANC31)";
String origname "ice_conc_ssmi";
String fullnamepath "/gt1r/freeboard_segment/heights/ice_conc_ssmi";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_height_segment_ssh_flag {
String long_name "Sea Surface Height Flag";
String units "1";
String source "Sea Ice ATBD";
Int16 valid_min 0;
Int16 valid_max 2;
String contentType "referenceInformation";
String description "Identifiesthe height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. The flags are set as follows: 0 = sea ice; 1 = potential reference sea surface height; 2 = used in calculating reference sea surface height";
String flag_meanings "sea_ice potential_sea_ice_surface new_meaning";
Int16 flag_values 0, 1, 2;
String origname "height_segment_ssh_flag";
String fullnamepath "/gt1r/freeboard_segment/heights/height_segment_ssh_flag";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_podppd_flag {
String long_name "POD_PPD Flag";
String units "1";
String source "ATL07, ATL03, ATL02, ANC04, ANC05";
Int16 valid_min 0;
Int16 valid_max 7;
String contentType "referenceInformation";
String description "Composite POD/PPD flag that indicates the quality of input geolocation products for the specific height_segment. Value for height segment is sampled from geolocation parameter on ATL03. A non-zero value may indicate that geolocation solutions are degraded or that ATLAS is within a calibration scan period (CAL). Possible non-CAL values are: 0=Nominal; 1=POD_DEGRADE; 2=PPD_DEGRADE; 3=PODPPD_DEGRADE; possible CAL values are: 4=CAL_NOMINAL; 5=CAL_POD_DEGRADE; 6=CAL_PPD_DEGRADE; 7=CAL_PODPPD_DEGRADE. (ATL07 podppd_flag)";
String flag_meanings "nominal pod_degrade ppd_degrade podppd_degrade cal_nominal cal_pod_degrade cal_ppd_degrade new_meaning";
Int16 flag_values 0, 1, 2, 3, 4, 5, 6, 7;
String origname "podppd_flag";
String fullnamepath "/gt1r/freeboard_segment/heights/podppd_flag";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_backgr_r_200 {
Float32 _FillValue 3.402823466e+38;
String long_name "background rate 200 hz";
String units "hz";
String source "ATL09";
String contentType "modelResult";
String description "Background count rate, averaged over the segment based on ATLAS 50 pulse counts";
String origname "backgr_r_200";
String fullnamepath "/gt1r/freeboard_segment/heights/backgr_r_200";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_height_segment_height {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Mean height from along-track segment fit determined by the sea ice algorithm(ATL07 h_si). The sea ice height is relative to the tide-free MSS.";
String origname "height_segment_height";
String fullnamepath "/gt1r/freeboard_segment/heights/height_segment_height";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_height_segment_type {
String long_name "Segment surface type";
String units "1";
String source "ATBD section 4.3";
Int16 valid_min -1;
Int16 valid_max 9;
String contentType "referenceInformation";
String description "Value that indicates segment surface type as sea ice or different types of sea surface. (0=cloud covered)";
String flag_meanings "cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough new_meaning";
Int16 flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1;
String origname "height_segment_type";
String fullnamepath "/gt1r/freeboard_segment/heights/height_segment_type";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_height_segment_confidence {
Float32 _FillValue 3.402823466e+38;
String long_name "Surface height confidence";
String units "1";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis (ATL07 h_confidence)";
String origname "height_segment_confidence";
String fullnamepath "/gt1r/freeboard_segment/heights/height_segment_confidence";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_asr_25 {
Float32 _FillValue 3.402823466e+38;
String long_name "Apparent surface reflectance at 25 hz";
String units "1";
String source "ATL07";
String contentType "modelResult";
String description "Apparent surface reflectance at 25 hz, average to the sea ice segment";
String origname "asr_25";
String fullnamepath "/gt1r/freeboard_segment/heights/asr_25";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_height_segment_w_gaussian {
Float32 _FillValue 3.402823466e+38;
String long_name "width of best fit gaussian";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Width of best fit gaussian (ATL07 w_gaussian)";
String origname "height_segment_w_gaussian";
String fullnamepath "/gt1r/freeboard_segment/heights/height_segment_w_gaussian";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_photon_rate {
Float32 _FillValue 3.402823466e+38;
String long_name "photon rate";
String units "1";
String source "ATL07";
String contentType "modelResult";
String description "Photon count rate, averaged over sea ice segment.";
String origname "photon_rate";
String fullnamepath "/gt1r/freeboard_segment/heights/photon_rate";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_backgr_r_25 {
Float32 _FillValue 3.402823466e+38;
String long_name "background rate 25 hz";
String units "hz";
String source "ATL09";
String contentType "modelResult";
String description "Background count rate, averaged over the segment based on 25 hz atmosphere";
String origname "backgr_r_25";
String fullnamepath "/gt1r/freeboard_segment/heights/backgr_r_25";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_heights_height_segment_rms {
Float32 _FillValue 3.402823466e+38;
String long_name "height rms";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "RMS difference between sea ice modeled and observed photon height distribution (ATL07 h_rms)";
String origname "height_segment_rms";
String fullnamepath "/gt1r/freeboard_segment/heights/height_segment_rms";
String coordinates "gt1r_freeboard_segment_heights_delta_time gt1r_freeboard_segment_heights_latitude gt1r_freeboard_segment_heights_longitude";
}
gt1r_freeboard_segment_height_segment_id {
String units "1";
String long_name "Identifier of each height segment";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Identifier of each height segment";
String origname "height_segment_id";
String fullnamepath "/gt1r/freeboard_segment/height_segment_id";
String coordinates "gt1r_freeboard_segment_delta_time gt1r_freeboard_segment_latitude gt1r_freeboard_segment_longitude";
}
gt1r_freeboard_segment_beam_fb_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard height relative to beam_refsurf_height";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Freeboard height based on ATL07 ice surface height relative to beam_refsurf_height.";
String origname "beam_fb_height";
String fullnamepath "/gt1r/freeboard_segment/beam_fb_height";
String coordinates "gt1r_freeboard_segment_delta_time gt1r_freeboard_segment_latitude gt1r_freeboard_segment_longitude";
}
gt1r_freeboard_segment_beam_fb_unc {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard segment uncertainty";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Combined uncertainty from the height segment sigma and the reference surface sigma estimates";
String origname "beam_fb_unc";
String fullnamepath "/gt1r/freeboard_segment/beam_fb_unc";
String coordinates "gt1r_freeboard_segment_delta_time gt1r_freeboard_segment_latitude gt1r_freeboard_segment_longitude";
}
gt1r_freeboard_segment_seg_dist_x {
String long_name "Along track distance";
String units "meters";
String source "Sea Ice ATBD";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing to the segment center.";
String origname "seg_dist_x";
String fullnamepath "/gt1r/freeboard_segment/seg_dist_x";
String coordinates "gt1r_freeboard_segment_delta_time gt1r_freeboard_segment_latitude gt1r_freeboard_segment_longitude";
}
gt1r_freeboard_segment_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+, Lon of freeboard segment center";
String origname "longitude";
String fullnamepath "/gt1r/freeboard_segment/longitude";
String coordinates "gt1r_freeboard_segment_delta_time gt1r_freeboard_segment_latitude";
}
gt1r_freeboard_segment_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of freeboard segment center";
String origname "latitude";
String fullnamepath "/gt1r/freeboard_segment/latitude";
String coordinates "gt1r_freeboard_segment_delta_time gt1r_freeboard_segment_longitude";
}
gt1r_freeboard_segment_beam_refsurf_ndx {
String long_name "Index to beam refsur";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "1-based index to reference surface used for this freeboard height. Its value is identical to the fbswath_ndx. This index also identifies the beam section with which the beam freeboard associated.";
String origname "beam_refsurf_ndx";
String fullnamepath "/gt1r/freeboard_segment/beam_refsurf_ndx";
String coordinates "gt1r_freeboard_segment_delta_time gt1r_freeboard_segment_latitude gt1r_freeboard_segment_longitude";
}
gt1r_freeboard_segment_geophysical_height_segment_dac {
Float32 _FillValue 3.402823466e+38;
String long_name "Dynamic Atmosphere Correction";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect (From ATL07)";
String origname "height_segment_dac";
String fullnamepath "/gt1r/freeboard_segment/geophysical/height_segment_dac";
String coordinates "gt1r_freeboard_segment_geophysical_delta_time gt1r_freeboard_segment_geophysical_latitude gt1r_freeboard_segment_geophysical_longitude";
}
gt1r_freeboard_segment_geophysical_height_segment_tide_pole {
Float32 _FillValue 3.402823466e+38;
String long_name "Pole Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). (From ATL07)";
String origname "height_segment_tide_pole";
String fullnamepath "/gt1r/freeboard_segment/geophysical/height_segment_tide_pole";
String coordinates "gt1r_freeboard_segment_geophysical_delta_time gt1r_freeboard_segment_geophysical_latitude gt1r_freeboard_segment_geophysical_longitude";
}
gt1r_freeboard_segment_geophysical_height_segment_ib {
Float32 _FillValue 3.402823466e+38;
String long_name "inverted barometer effect";
String units "meters";
String source "ATBD section 4.2";
String contentType "referenceInformation";
String description "Inverted barometer effect calculated from surface pressure";
String origname "height_segment_ib";
String fullnamepath "/gt1r/freeboard_segment/geophysical/height_segment_ib";
String coordinates "gt1r_freeboard_segment_geophysical_delta_time gt1r_freeboard_segment_geophysical_latitude gt1r_freeboard_segment_geophysical_longitude";
}
gt1r_freeboard_segment_geophysical_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+,Lon of segment center";
String origname "longitude";
String fullnamepath "/gt1r/freeboard_segment/geophysical/longitude";
String coordinates "gt1r_freeboard_segment_geophysical_delta_time gt1r_freeboard_segment_geophysical_latitude";
}
gt1r_freeboard_segment_geophysical_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of segment center";
String origname "latitude";
String fullnamepath "/gt1r/freeboard_segment/geophysical/latitude";
String coordinates "gt1r_freeboard_segment_geophysical_delta_time gt1r_freeboard_segment_geophysical_longitude";
}
gt1r_freeboard_segment_geophysical_height_segment_load {
String units "meters";
Float32 _FillValue 3.402823466e+38;
String long_name "Load Tide";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). (From ATL07)";
String origname "height_segment_load";
String fullnamepath "/gt1r/freeboard_segment/geophysical/height_segment_load";
String coordinates "gt1r_freeboard_segment_geophysical_delta_time gt1r_freeboard_segment_geophysical_latitude gt1r_freeboard_segment_geophysical_longitude";
}
gt1r_freeboard_segment_geophysical_height_segment_geoid {
Float32 _FillValue 3.402823466e+38;
String long_name "EGM2008 Geoid";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model (From ATL07). The geoid height is in the tide-free system.";
String origname "height_segment_geoid";
String fullnamepath "/gt1r/freeboard_segment/geophysical/height_segment_geoid";
String coordinates "gt1r_freeboard_segment_geophysical_delta_time gt1r_freeboard_segment_geophysical_latitude gt1r_freeboard_segment_geophysical_longitude";
}
gt1r_freeboard_segment_geophysical_height_segment_ocean {
Float32 _FillValue 3.402823466e+38;
String long_name "Ocean Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium).";
String origname "height_segment_ocean";
String fullnamepath "/gt1r/freeboard_segment/geophysical/height_segment_ocean";
String coordinates "gt1r_freeboard_segment_geophysical_delta_time gt1r_freeboard_segment_geophysical_latitude gt1r_freeboard_segment_geophysical_longitude";
}
gt1r_freeboard_segment_geophysical_height_segment_dynib {
Float32 _FillValue 3.402823466e+38;
String long_name "Dynamic inverted barometer effect";
String standard_name "dynamic inverted barometer";
String units "meters";
String source "ATBD section 4.2";
String contentType "referenceInformation";
String description "Inverted barometer effect calculated from dynamic mean ocean sea level pressure (computed using ANC10 and ANC48, /ancillary_data/freeboard_estimation/mean_ocean_slp)";
String origname "height_segment_dynib";
String fullnamepath "/gt1r/freeboard_segment/geophysical/height_segment_dynib";
String coordinates "gt1r_freeboard_segment_geophysical_delta_time gt1r_freeboard_segment_geophysical_latitude gt1r_freeboard_segment_geophysical_longitude";
}
gt1r_freeboard_segment_geophysical_height_segment_earth_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Earth Tide Free-to-Mean conversion";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Additive value to convert solid earth tide from the tide-free system to the mean-tide system. (Add to height_segment_earth to get the solid earth tides in the mean-tide system.)";
String origname "height_segment_earth_free2mean";
String fullnamepath "/gt1r/freeboard_segment/geophysical/height_segment_earth_free2mean";
String coordinates "gt1r_freeboard_segment_geophysical_delta_time gt1r_freeboard_segment_geophysical_latitude gt1r_freeboard_segment_geophysical_longitude";
}
gt1r_freeboard_segment_geophysical_height_segment_geoid_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "EGM2008 Geoid Free-to-Mean conversion";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system. (Add to height_segment_geoid to get the geoid heights in the mean-tide system.)";
String origname "height_segment_geoid_free2mean";
String fullnamepath "/gt1r/freeboard_segment/geophysical/height_segment_geoid_free2mean";
String coordinates "gt1r_freeboard_segment_geophysical_delta_time gt1r_freeboard_segment_geophysical_latitude gt1r_freeboard_segment_geophysical_longitude";
}
gt1r_freeboard_segment_geophysical_height_segment_mss {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean Sea Surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Mean sea surface height above WGS-84 reference ellipsoid (range: -68 to 65m), based on a CryoSat-2/DTU14 merged product (https://doi.org/10.5281/zenodo.4294047). The MSS height (from ANC15 used in atlas_l3a_si processing) is adjusted to be in a tide free reference system (subtracting the geoid_free2mean correction) to be consistent with the tide free ATL03 heights.";
String origname "height_segment_mss";
String fullnamepath "/gt1r/freeboard_segment/geophysical/height_segment_mss";
String coordinates "gt1r_freeboard_segment_geophysical_delta_time gt1r_freeboard_segment_geophysical_latitude gt1r_freeboard_segment_geophysical_longitude";
}
gt1r_freeboard_segment_geophysical_height_segment_lpe {
Float32 _FillValue 3.402823466e+38;
String long_name "Equilibrium Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Long period equilibrium tide self-consistent with ocean tide model (+-0.04m).";
String origname "height_segment_lpe";
String fullnamepath "/gt1r/freeboard_segment/geophysical/height_segment_lpe";
String coordinates "gt1r_freeboard_segment_geophysical_delta_time gt1r_freeboard_segment_geophysical_latitude gt1r_freeboard_segment_geophysical_longitude";
}
gt1r_freeboard_segment_geophysical_height_segment_earth {
String units "meters";
Float32 _FillValue 3.402823466e+38;
String long_name "Earth Tide";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Solid Earth Tide (From ATL07). The solid earth tide height is in the tide-free system.";
String origname "height_segment_earth";
String fullnamepath "/gt1r/freeboard_segment/geophysical/height_segment_earth";
String coordinates "gt1r_freeboard_segment_geophysical_delta_time gt1r_freeboard_segment_geophysical_latitude gt1r_freeboard_segment_geophysical_longitude";
}
gt1r_freeboard_segment_geoseg_beg {
String long_name "Beginning GEOSEG";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment";
String origname "geoseg_beg";
String fullnamepath "/gt1r/freeboard_segment/geoseg_beg";
String coordinates "gt1r_freeboard_segment_delta_time gt1r_freeboard_segment_latitude gt1r_freeboard_segment_longitude";
}
gt1r_freeboard_segment_beam_fb_confidence {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard confidence";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Confidence level in the freeboard estimate";
String origname "beam_fb_confidence";
String fullnamepath "/gt1r/freeboard_segment/beam_fb_confidence";
String coordinates "gt1r_freeboard_segment_delta_time gt1r_freeboard_segment_latitude gt1r_freeboard_segment_longitude";
}
gt1r_freeboard_segment_geoseg_end {
String long_name "Ending GEOSEG";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment";
String origname "geoseg_end";
String fullnamepath "/gt1r/freeboard_segment/geoseg_end";
String coordinates "gt1r_freeboard_segment_delta_time gt1r_freeboard_segment_latitude gt1r_freeboard_segment_longitude";
}
gt1r_freeboard_segment_beam_fb_quality_flag {
String units "1";
String long_name "Flag describing the quality of the freeboard estimate";
String source "ATBD section 5";
Int16 valid_min -1;
Int16 valid_max 5;
String contentType "referenceInformation";
String description "Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor).";
String flag_meanings "invalid best high med low poor";
Int16 flag_values -1, 1, 2, 3, 4, 5;
String origname "beam_fb_quality_flag";
String fullnamepath "/gt1r/freeboard_segment/beam_fb_quality_flag";
String coordinates "gt1r_freeboard_segment_delta_time gt1r_freeboard_segment_latitude gt1r_freeboard_segment_longitude";
}
gt1r_reference_surface_section_beam_refsurf_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface height sigma";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface height sigma (standard deviation) - weighted combination of lead sigmas in this beam for this swath segment";
String origname "beam_refsurf_sigma";
String fullnamepath "/gt1r/reference_surface_section/beam_refsurf_sigma";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_beam_refsurf_alongtrack_slope {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface along track slope";
String units "degrees";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface height along track slope";
String origname "beam_refsurf_alongtrack_slope";
String fullnamepath "/gt1r/reference_surface_section/beam_refsurf_alongtrack_slope";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_beam_lead_ndx {
String long_name "index first lead";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "1-based index to the first /GTx/leads lead used for this beam's reference surface.";
String origname "beam_lead_ndx";
String fullnamepath "/gt1r/reference_surface_section/beam_lead_ndx";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_beam_refsurf_mss {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section Mean Sea Surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Mean sea surface height above WGS-84 reference ellipsoid at reference surface length scale, sampled from height_segment_mss (tide free).";
String origname "beam_refsurf_mss";
String fullnamepath "/gt1r/reference_surface_section/beam_refsurf_mss";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_beam_fb_hist_refsurf {
String long_name "Reference surface section freeboard histogram";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Reference surface freeboard histogram (distribution) for this reference surface section";
String origname "beam_fb_hist_refsurf";
String fullnamepath "/gt1r/reference_surface_section/beam_fb_hist_refsurf";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_beam_refsurf_geoid {
Float32 _FillValue 3.402823466e+38;
String long_name "reference surface section mean EGM2008 Geoid";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geoid height above WGS-84 reference ellipsoid at the reference surface length scale (range -107 to 86m), based on the EGM2008 model. The geoid height is in the tide-free system.";
String origname "beam_refsurf_geoid";
String fullnamepath "/gt1r/reference_surface_section/beam_refsurf_geoid";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_beam_refsurf_interp_flag {
String long_name "Reference surface section interpolation flag";
String units "1";
String source "ATBD section 5";
Int16 valid_min -1;
Int16 valid_max 3;
String contentType "referenceInformation";
String description "Identifies reference surface sections with reference surface height filled through interpolation. -1 = no valid reference surface determined; 0= reference surface computed from leads in this swath; 1 = reference surface computed by interpolation using two valid reference surface (constrained by thresholds maxgaptime and maxgapht); 2 = reference surface computed using one-point fill (linear interpolation between two adjacent valid reference surfaces, constrained by threshold maxpadtime); 3 = reference surface computed using end-point fill (missing reference surface is set to the previous or next adjacent valid reference surface, constrained by threshold maxpadtime)";
String flag_meanings "no_surf leads_in_swath inferred one-point_fill end-point_fill";
Int16 flag_values -1, 0, 1, 2, 3;
String origname "beam_refsurf_interp_flag";
String fullnamepath "/gt1r/reference_surface_section/beam_refsurf_interp_flag";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_beam_refsurf_geoid_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface geoid free-to-mean conversion";
String standard_name "geoid free2mean";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system at reference surface length scale.";
String origname "beam_refsurf_geoid_free2mean";
String fullnamepath "/gt1r/reference_surface_section/beam_refsurf_geoid_free2mean";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_longitude {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Center longitude of reference surface section";
String standard_name "longitude";
String units "degrees_east";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center longitude of reference surface section (mean of all freeboard longitudes)";
String origname "longitude";
String fullnamepath "/gt1r/reference_surface_section/longitude";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude";
}
gt1r_reference_surface_section_beam_refsurf_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section height mean";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface section mean height - weighted combination of leads in this beam for this reference surface section. The reference surface height is relative to the tide-free MSS.";
String origname "beam_refsurf_height";
String fullnamepath "/gt1r/reference_surface_section/beam_refsurf_height";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_latitude {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Center latitude of reference surface section";
String standard_name "latitude";
String units "degrees_north";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center latitude of reference surface section (mean of all freeboard latitudes)";
String origname "latitude";
String fullnamepath "/gt1r/reference_surface_section/latitude";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_beam_refsurf_earth_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section solid earth tide free-to-mean conversion";
String standard_name "solid earth tide free2mean";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Additive value to convert solid earth tide from the tide-free system to the mean-tide system at reference surface length scale.";
String origname "beam_refsurf_earth_free2mean";
String fullnamepath "/gt1r/reference_surface_section/beam_refsurf_earth_free2mean";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_beam_fb_unc_refsurf {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean freeboard uncertainty";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Freeboard uncertainty estimate from the reference surface section mean freeboard, sampled from beam_freeboard/beam_fb_unc";
String origname "beam_fb_unc_refsurf";
String fullnamepath "/gt1r/reference_surface_section/beam_fb_unc_refsurf";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_beam_fb_length_refsurf_sum {
Float32 _FillValue 3.402823466e+38;
String long_name "Total length of freeboard segments";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Length of freeboard beam-segments within this reference surface section";
String origname "beam_fb_length_refsurf_sum";
String fullnamepath "/gt1r/reference_surface_section/beam_fb_length_refsurf_sum";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_fbswath_ndx {
String long_name "Index to freeboard swath segment";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "The 1-based fbswath_nx identifies the swath associated with each element. There are the same number of elements in the group /freeboard_swath_segment and in each of the /GTx/freeboard_beam_segment groups. The fbswath_nx identifies the fbswath_refsurf_height used to compute the fbswath_fb_height. It is the same index number that idenitifies the beam_refsurf_height to its swath and the beam_refsurf_height used to computed the beam_fb_height.";
String origname "fbswath_ndx";
String fullnamepath "/gt1r/reference_surface_section/fbswath_ndx";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_beam_refsurf_dist_x {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Along track distance";
String standard_name "distance";
String units "m";
String source "atl07";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing. Distance is calculated by averaging distance of all leads contained in reference surface.";
String origname "beam_refsurf_dist_x";
String fullnamepath "/gt1r/reference_surface_section/beam_refsurf_dist_x";
String coordinates "gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_beam_fb_refsurf {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean reference surface section freeboard";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Mean segment length weighted reference surface freeboard.";
String origname "beam_fb_refsurf";
String fullnamepath "/gt1r/reference_surface_section/beam_fb_refsurf";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_reference_surface_section_beam_lead_n {
String long_name "Number of leads";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Number of leads used for this beam reference surface section";
String origname "beam_lead_n";
String fullnamepath "/gt1r/reference_surface_section/beam_lead_n";
String coordinates "gt1r_reference_surface_section_delta_time gt1r_reference_surface_section_latitude gt1r_reference_surface_section_longitude";
}
gt1r_leads_lead_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead sigma estimate";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Lead height sigma (standard deviation) estimate - weighted combination of sea surface height sigmas used as leads in this beam for this swath segment";
String origname "lead_sigma";
String fullnamepath "/gt1r/leads/lead_sigma";
String coordinates "gt1r_leads_delta_time gt1r_leads_latitude gt1r_leads_longitude";
}
gt1r_leads_lead_dist_x {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Along Track Distance";
String standard_name "distance";
String units "m";
String source "atl07";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing. Distance is calculated by averaging distance of all ssh segments contained in lead.";
String origname "lead_dist_x";
String fullnamepath "/gt1r/leads/lead_dist_x";
String coordinates "gt1r_leads_latitude gt1r_leads_longitude";
}
gt1r_leads_longitude {
String long_name "Center longitude of lead";
String standard_name "longitude";
String units "degrees_east";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center longitude of lead (mean of all freeboard longitudes)";
String origname "longitude";
String fullnamepath "/gt1r/leads/longitude";
String coordinates "gt1r_leads_delta_time gt1r_leads_latitude";
}
gt1r_leads_latitude {
String long_name "Center latitude of lead";
String standard_name "latitude";
String units "degrees_north";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center latitude of lead (mean of all sea surface height latitudes)";
String origname "latitude";
String fullnamepath "/gt1r/leads/latitude";
String coordinates "gt1r_leads_delta_time gt1r_leads_longitude";
}
gt1r_leads_lead_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead height";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Lead height - weighted mean of consective sea surface heights used for this lead. The lead height is relative to the tide-free MSS.";
String origname "lead_height";
String fullnamepath "/gt1r/leads/lead_height";
String coordinates "gt1r_leads_delta_time gt1r_leads_latitude gt1r_leads_longitude";
}
gt1r_leads_ssh_ndx {
String long_name "index first sea surface";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "1-based index to the first freeboard element (i.e.first sea surface height segment) used for this lead";
String origname "ssh_ndx";
String fullnamepath "/gt1r/leads/ssh_ndx";
String coordinates "gt1r_leads_delta_time gt1r_leads_latitude gt1r_leads_longitude";
}
gt1r_leads_ssh_n {
String long_name "number of sea surface references";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Number of sea surface height segments used for this lead";
String origname "ssh_n";
String fullnamepath "/gt1r/leads/ssh_n";
String coordinates "gt1r_leads_delta_time gt1r_leads_latitude gt1r_leads_longitude";
}
gt1r_leads_lead_length {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead size";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Along-track length of this lead";
String origname "lead_length";
String fullnamepath "/gt1r/leads/lead_length";
String coordinates "gt1r_leads_delta_time gt1r_leads_latitude gt1r_leads_longitude";
}
gt2r_freeboard_segment_heights_msw_flag {
String long_name "multiple scattering warning flag";
String units "1";
String source "ATL09";
Int16 valid_min -1;
Int16 valid_max 5;
String contentType "modelResult";
String description "Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight.";
String flag_meanings "cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5";
Int16 flag_values -1, 0, 1, 2, 3, 4, 5;
String origname "msw_flag";
String fullnamepath "/gt2r/freeboard_segment/heights/msw_flag";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_cloud_flag_atm {
String long_name "cloud flag atm";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 10;
String contentType "modelResult";
String description "Number of layers found from the backscatter profile using the DDA layer finder";
String origname "cloud_flag_atm";
String fullnamepath "/gt2r/freeboard_segment/heights/cloud_flag_atm";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_height_segment_length_seg {
Float32 _FillValue 3.402823466e+38;
String long_name "length of segment";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Along-track length of segment containing n_photons_actual (ATL07 length_seg)";
String origname "height_segment_length_seg";
String fullnamepath "/gt2r/freeboard_segment/heights/height_segment_length_seg";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_bsnow_con {
Float32 _FillValue 3.402823466e+38;
String long_name "Blowing snow confidence";
String units "1";
String source "ATL09";
String contentType "modelResult";
String description "Blowing snow confidence";
String origname "bsnow_con";
String fullnamepath "/gt2r/freeboard_segment/heights/bsnow_con";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_layer_flag {
String long_name "consolidated cloud flag";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 1;
String contentType "modelResult";
String description "This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow.";
String flag_meanings "likely_clear likely_cloudy";
Int16 flag_values 0, 1;
String origname "layer_flag";
String fullnamepath "/gt2r/freeboard_segment/heights/layer_flag";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_backgr_calc {
Float32 _FillValue 3.402823466e+38;
String long_name "background count rate calculated";
String units "hz";
String source "ATL07";
String contentType "modelResult";
String description "Calculated background count rate based on sun angle, surface slope, unit reflectance";
String origname "backgr_calc";
String fullnamepath "/gt2r/freeboard_segment/heights/backgr_calc";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_ice_conc_amsr2 {
Float32 _FillValue 3.402823466e+38;
String long_name "sea ice concentration from AMSR2 file";
String units "1";
String source "ATL07/ANC31";
String contentType "modelResult";
String description "Sea ice concentration from daily AMSR2 sea ice concentration file (ANC49)";
String origname "ice_conc_amsr2";
String fullnamepath "/gt2r/freeboard_segment/heights/ice_conc_amsr2";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_bsnow_h {
Float32 _FillValue 3.402823466e+38;
String long_name "Blowing snow top height";
String units "meters";
String source "ATL09";
String contentType "modelResult";
String description "Blowing snow layer top height";
String origname "bsnow_h";
String fullnamepath "/gt2r/freeboard_segment/heights/bsnow_h";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+, Lon of segment center";
String origname "longitude";
String fullnamepath "/gt2r/freeboard_segment/heights/longitude";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude";
}
gt2r_freeboard_segment_heights_height_segment_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "h surface sigma";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Sigma height surface error estimate - width of the trimmed histogram divided by the number of photons.";
String origname "height_segment_sigma";
String fullnamepath "/gt2r/freeboard_segment/heights/height_segment_sigma";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_background_r_norm {
Float32 _FillValue 3.402823466e+38;
String long_name "normalized background (50 shot)";
String units "hz";
String source "ATL07";
String contentType "modelResult";
String description "Background rate normalized to a fixed solar elevation angle";
String origname "background_r_norm";
String fullnamepath "/gt2r/freeboard_segment/heights/background_r_norm";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of segment center";
String origname "latitude";
String fullnamepath "/gt2r/freeboard_segment/heights/latitude";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_height_segment_ocdepth {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment ocean depth";
String standard_name "ocdepth";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Height segment ocean depth";
String origname "height_segment_ocdepth";
String fullnamepath "/gt2r/freeboard_segment/heights/height_segment_ocdepth";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_height_segment_dist2land {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment distance to land";
String standard_name "dist2land";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Height segment distance to land";
String origname "height_segment_dist2land";
String fullnamepath "/gt2r/freeboard_segment/heights/height_segment_dist2land";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_cloud_flag_asr {
String long_name "cloud flag asr";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 5;
String contentType "modelResult";
String description "Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence";
String flag_meanings "clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence";
Int16 flag_values 0, 1, 2, 3, 4, 5;
String origname "cloud_flag_asr";
String fullnamepath "/gt2r/freeboard_segment/heights/cloud_flag_asr";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_ice_conc_ssmi {
Float32 _FillValue 3.402823466e+38;
String long_name "sea ice concentration";
String units "1";
String source "ATL07/ANC31";
String contentType "modelResult";
String description "Sea ice concentration from daily SSMI sea ice concentration file (ANC31)";
String origname "ice_conc_ssmi";
String fullnamepath "/gt2r/freeboard_segment/heights/ice_conc_ssmi";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_height_segment_ssh_flag {
String long_name "Sea Surface Height Flag";
String units "1";
String source "Sea Ice ATBD";
Int16 valid_min 0;
Int16 valid_max 2;
String contentType "referenceInformation";
String description "Identifiesthe height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. The flags are set as follows: 0 = sea ice; 1 = potential reference sea surface height; 2 = used in calculating reference sea surface height";
String flag_meanings "sea_ice potential_sea_ice_surface new_meaning";
Int16 flag_values 0, 1, 2;
String origname "height_segment_ssh_flag";
String fullnamepath "/gt2r/freeboard_segment/heights/height_segment_ssh_flag";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_podppd_flag {
String long_name "POD_PPD Flag";
String units "1";
String source "ATL07, ATL03, ATL02, ANC04, ANC05";
Int16 valid_min 0;
Int16 valid_max 7;
String contentType "referenceInformation";
String description "Composite POD/PPD flag that indicates the quality of input geolocation products for the specific height_segment. Value for height segment is sampled from geolocation parameter on ATL03. A non-zero value may indicate that geolocation solutions are degraded or that ATLAS is within a calibration scan period (CAL). Possible non-CAL values are: 0=Nominal; 1=POD_DEGRADE; 2=PPD_DEGRADE; 3=PODPPD_DEGRADE; possible CAL values are: 4=CAL_NOMINAL; 5=CAL_POD_DEGRADE; 6=CAL_PPD_DEGRADE; 7=CAL_PODPPD_DEGRADE. (ATL07 podppd_flag)";
String flag_meanings "nominal pod_degrade ppd_degrade podppd_degrade cal_nominal cal_pod_degrade cal_ppd_degrade new_meaning";
Int16 flag_values 0, 1, 2, 3, 4, 5, 6, 7;
String origname "podppd_flag";
String fullnamepath "/gt2r/freeboard_segment/heights/podppd_flag";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_backgr_r_200 {
Float32 _FillValue 3.402823466e+38;
String long_name "background rate 200 hz";
String units "hz";
String source "ATL09";
String contentType "modelResult";
String description "Background count rate, averaged over the segment based on ATLAS 50 pulse counts";
String origname "backgr_r_200";
String fullnamepath "/gt2r/freeboard_segment/heights/backgr_r_200";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_height_segment_height {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Mean height from along-track segment fit determined by the sea ice algorithm(ATL07 h_si). The sea ice height is relative to the tide-free MSS.";
String origname "height_segment_height";
String fullnamepath "/gt2r/freeboard_segment/heights/height_segment_height";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_height_segment_type {
String long_name "Segment surface type";
String units "1";
String source "ATBD section 4.3";
Int16 valid_min -1;
Int16 valid_max 9;
String contentType "referenceInformation";
String description "Value that indicates segment surface type as sea ice or different types of sea surface. (0=cloud covered)";
String flag_meanings "cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough new_meaning";
Int16 flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1;
String origname "height_segment_type";
String fullnamepath "/gt2r/freeboard_segment/heights/height_segment_type";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_height_segment_confidence {
Float32 _FillValue 3.402823466e+38;
String long_name "Surface height confidence";
String units "1";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis (ATL07 h_confidence)";
String origname "height_segment_confidence";
String fullnamepath "/gt2r/freeboard_segment/heights/height_segment_confidence";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_asr_25 {
Float32 _FillValue 3.402823466e+38;
String long_name "Apparent surface reflectance at 25 hz";
String units "1";
String source "ATL07";
String contentType "modelResult";
String description "Apparent surface reflectance at 25 hz, average to the sea ice segment";
String origname "asr_25";
String fullnamepath "/gt2r/freeboard_segment/heights/asr_25";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_height_segment_w_gaussian {
Float32 _FillValue 3.402823466e+38;
String long_name "width of best fit gaussian";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Width of best fit gaussian (ATL07 w_gaussian)";
String origname "height_segment_w_gaussian";
String fullnamepath "/gt2r/freeboard_segment/heights/height_segment_w_gaussian";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_photon_rate {
Float32 _FillValue 3.402823466e+38;
String long_name "photon rate";
String units "1";
String source "ATL07";
String contentType "modelResult";
String description "Photon count rate, averaged over sea ice segment.";
String origname "photon_rate";
String fullnamepath "/gt2r/freeboard_segment/heights/photon_rate";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_backgr_r_25 {
Float32 _FillValue 3.402823466e+38;
String long_name "background rate 25 hz";
String units "hz";
String source "ATL09";
String contentType "modelResult";
String description "Background count rate, averaged over the segment based on 25 hz atmosphere";
String origname "backgr_r_25";
String fullnamepath "/gt2r/freeboard_segment/heights/backgr_r_25";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_heights_height_segment_rms {
Float32 _FillValue 3.402823466e+38;
String long_name "height rms";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "RMS difference between sea ice modeled and observed photon height distribution (ATL07 h_rms)";
String origname "height_segment_rms";
String fullnamepath "/gt2r/freeboard_segment/heights/height_segment_rms";
String coordinates "gt2r_freeboard_segment_heights_delta_time gt2r_freeboard_segment_heights_latitude gt2r_freeboard_segment_heights_longitude";
}
gt2r_freeboard_segment_height_segment_id {
String units "1";
String long_name "Identifier of each height segment";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Identifier of each height segment";
String origname "height_segment_id";
String fullnamepath "/gt2r/freeboard_segment/height_segment_id";
String coordinates "gt2r_freeboard_segment_delta_time gt2r_freeboard_segment_latitude gt2r_freeboard_segment_longitude";
}
gt2r_freeboard_segment_beam_fb_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard height relative to beam_refsurf_height";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Freeboard height based on ATL07 ice surface height relative to beam_refsurf_height.";
String origname "beam_fb_height";
String fullnamepath "/gt2r/freeboard_segment/beam_fb_height";
String coordinates "gt2r_freeboard_segment_delta_time gt2r_freeboard_segment_latitude gt2r_freeboard_segment_longitude";
}
gt2r_freeboard_segment_beam_fb_unc {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard segment uncertainty";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Combined uncertainty from the height segment sigma and the reference surface sigma estimates";
String origname "beam_fb_unc";
String fullnamepath "/gt2r/freeboard_segment/beam_fb_unc";
String coordinates "gt2r_freeboard_segment_delta_time gt2r_freeboard_segment_latitude gt2r_freeboard_segment_longitude";
}
gt2r_freeboard_segment_seg_dist_x {
String long_name "Along track distance";
String units "meters";
String source "Sea Ice ATBD";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing to the segment center.";
String origname "seg_dist_x";
String fullnamepath "/gt2r/freeboard_segment/seg_dist_x";
String coordinates "gt2r_freeboard_segment_delta_time gt2r_freeboard_segment_latitude gt2r_freeboard_segment_longitude";
}
gt2r_freeboard_segment_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+, Lon of freeboard segment center";
String origname "longitude";
String fullnamepath "/gt2r/freeboard_segment/longitude";
String coordinates "gt2r_freeboard_segment_delta_time gt2r_freeboard_segment_latitude";
}
gt2r_freeboard_segment_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of freeboard segment center";
String origname "latitude";
String fullnamepath "/gt2r/freeboard_segment/latitude";
String coordinates "gt2r_freeboard_segment_delta_time gt2r_freeboard_segment_longitude";
}
gt2r_freeboard_segment_beam_refsurf_ndx {
String long_name "Index to beam refsur";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "1-based index to reference surface used for this freeboard height. Its value is identical to the fbswath_ndx. This index also identifies the beam section with which the beam freeboard associated.";
String origname "beam_refsurf_ndx";
String fullnamepath "/gt2r/freeboard_segment/beam_refsurf_ndx";
String coordinates "gt2r_freeboard_segment_delta_time gt2r_freeboard_segment_latitude gt2r_freeboard_segment_longitude";
}
gt2r_freeboard_segment_geophysical_height_segment_dac {
Float32 _FillValue 3.402823466e+38;
String long_name "Dynamic Atmosphere Correction";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect (From ATL07)";
String origname "height_segment_dac";
String fullnamepath "/gt2r/freeboard_segment/geophysical/height_segment_dac";
String coordinates "gt2r_freeboard_segment_geophysical_delta_time gt2r_freeboard_segment_geophysical_latitude gt2r_freeboard_segment_geophysical_longitude";
}
gt2r_freeboard_segment_geophysical_height_segment_tide_pole {
Float32 _FillValue 3.402823466e+38;
String long_name "Pole Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). (From ATL07)";
String origname "height_segment_tide_pole";
String fullnamepath "/gt2r/freeboard_segment/geophysical/height_segment_tide_pole";
String coordinates "gt2r_freeboard_segment_geophysical_delta_time gt2r_freeboard_segment_geophysical_latitude gt2r_freeboard_segment_geophysical_longitude";
}
gt2r_freeboard_segment_geophysical_height_segment_ib {
Float32 _FillValue 3.402823466e+38;
String long_name "inverted barometer effect";
String units "meters";
String source "ATBD section 4.2";
String contentType "referenceInformation";
String description "Inverted barometer effect calculated from surface pressure";
String origname "height_segment_ib";
String fullnamepath "/gt2r/freeboard_segment/geophysical/height_segment_ib";
String coordinates "gt2r_freeboard_segment_geophysical_delta_time gt2r_freeboard_segment_geophysical_latitude gt2r_freeboard_segment_geophysical_longitude";
}
gt2r_freeboard_segment_geophysical_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+,Lon of segment center";
String origname "longitude";
String fullnamepath "/gt2r/freeboard_segment/geophysical/longitude";
String coordinates "gt2r_freeboard_segment_geophysical_delta_time gt2r_freeboard_segment_geophysical_latitude";
}
gt2r_freeboard_segment_geophysical_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of segment center";
String origname "latitude";
String fullnamepath "/gt2r/freeboard_segment/geophysical/latitude";
String coordinates "gt2r_freeboard_segment_geophysical_delta_time gt2r_freeboard_segment_geophysical_longitude";
}
gt2r_freeboard_segment_geophysical_height_segment_load {
String units "meters";
Float32 _FillValue 3.402823466e+38;
String long_name "Load Tide";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). (From ATL07)";
String origname "height_segment_load";
String fullnamepath "/gt2r/freeboard_segment/geophysical/height_segment_load";
String coordinates "gt2r_freeboard_segment_geophysical_delta_time gt2r_freeboard_segment_geophysical_latitude gt2r_freeboard_segment_geophysical_longitude";
}
gt2r_freeboard_segment_geophysical_height_segment_geoid {
Float32 _FillValue 3.402823466e+38;
String long_name "EGM2008 Geoid";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model (From ATL07). The geoid height is in the tide-free system.";
String origname "height_segment_geoid";
String fullnamepath "/gt2r/freeboard_segment/geophysical/height_segment_geoid";
String coordinates "gt2r_freeboard_segment_geophysical_delta_time gt2r_freeboard_segment_geophysical_latitude gt2r_freeboard_segment_geophysical_longitude";
}
gt2r_freeboard_segment_geophysical_height_segment_ocean {
Float32 _FillValue 3.402823466e+38;
String long_name "Ocean Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium).";
String origname "height_segment_ocean";
String fullnamepath "/gt2r/freeboard_segment/geophysical/height_segment_ocean";
String coordinates "gt2r_freeboard_segment_geophysical_delta_time gt2r_freeboard_segment_geophysical_latitude gt2r_freeboard_segment_geophysical_longitude";
}
gt2r_freeboard_segment_geophysical_height_segment_dynib {
Float32 _FillValue 3.402823466e+38;
String long_name "Dynamic inverted barometer effect";
String standard_name "dynamic inverted barometer";
String units "meters";
String source "ATBD section 4.2";
String contentType "referenceInformation";
String description "Inverted barometer effect calculated from dynamic mean ocean sea level pressure (computed using ANC10 and ANC48, /ancillary_data/freeboard_estimation/mean_ocean_slp)";
String origname "height_segment_dynib";
String fullnamepath "/gt2r/freeboard_segment/geophysical/height_segment_dynib";
String coordinates "gt2r_freeboard_segment_geophysical_delta_time gt2r_freeboard_segment_geophysical_latitude gt2r_freeboard_segment_geophysical_longitude";
}
gt2r_freeboard_segment_geophysical_height_segment_earth_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Earth Tide Free-to-Mean conversion";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Additive value to convert solid earth tide from the tide-free system to the mean-tide system. (Add to height_segment_earth to get the solid earth tides in the mean-tide system.)";
String origname "height_segment_earth_free2mean";
String fullnamepath "/gt2r/freeboard_segment/geophysical/height_segment_earth_free2mean";
String coordinates "gt2r_freeboard_segment_geophysical_delta_time gt2r_freeboard_segment_geophysical_latitude gt2r_freeboard_segment_geophysical_longitude";
}
gt2r_freeboard_segment_geophysical_height_segment_geoid_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "EGM2008 Geoid Free-to-Mean conversion";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system. (Add to height_segment_geoid to get the geoid heights in the mean-tide system.)";
String origname "height_segment_geoid_free2mean";
String fullnamepath "/gt2r/freeboard_segment/geophysical/height_segment_geoid_free2mean";
String coordinates "gt2r_freeboard_segment_geophysical_delta_time gt2r_freeboard_segment_geophysical_latitude gt2r_freeboard_segment_geophysical_longitude";
}
gt2r_freeboard_segment_geophysical_height_segment_mss {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean Sea Surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Mean sea surface height above WGS-84 reference ellipsoid (range: -68 to 65m), based on a CryoSat-2/DTU14 merged product (https://doi.org/10.5281/zenodo.4294047). The MSS height (from ANC15 used in atlas_l3a_si processing) is adjusted to be in a tide free reference system (subtracting the geoid_free2mean correction) to be consistent with the tide free ATL03 heights.";
String origname "height_segment_mss";
String fullnamepath "/gt2r/freeboard_segment/geophysical/height_segment_mss";
String coordinates "gt2r_freeboard_segment_geophysical_delta_time gt2r_freeboard_segment_geophysical_latitude gt2r_freeboard_segment_geophysical_longitude";
}
gt2r_freeboard_segment_geophysical_height_segment_lpe {
Float32 _FillValue 3.402823466e+38;
String long_name "Equilibrium Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Long period equilibrium tide self-consistent with ocean tide model (+-0.04m).";
String origname "height_segment_lpe";
String fullnamepath "/gt2r/freeboard_segment/geophysical/height_segment_lpe";
String coordinates "gt2r_freeboard_segment_geophysical_delta_time gt2r_freeboard_segment_geophysical_latitude gt2r_freeboard_segment_geophysical_longitude";
}
gt2r_freeboard_segment_geophysical_height_segment_earth {
String units "meters";
Float32 _FillValue 3.402823466e+38;
String long_name "Earth Tide";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Solid Earth Tide (From ATL07). The solid earth tide height is in the tide-free system.";
String origname "height_segment_earth";
String fullnamepath "/gt2r/freeboard_segment/geophysical/height_segment_earth";
String coordinates "gt2r_freeboard_segment_geophysical_delta_time gt2r_freeboard_segment_geophysical_latitude gt2r_freeboard_segment_geophysical_longitude";
}
gt2r_freeboard_segment_geoseg_beg {
String long_name "Beginning GEOSEG";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment";
String origname "geoseg_beg";
String fullnamepath "/gt2r/freeboard_segment/geoseg_beg";
String coordinates "gt2r_freeboard_segment_delta_time gt2r_freeboard_segment_latitude gt2r_freeboard_segment_longitude";
}
gt2r_freeboard_segment_beam_fb_confidence {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard confidence";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Confidence level in the freeboard estimate";
String origname "beam_fb_confidence";
String fullnamepath "/gt2r/freeboard_segment/beam_fb_confidence";
String coordinates "gt2r_freeboard_segment_delta_time gt2r_freeboard_segment_latitude gt2r_freeboard_segment_longitude";
}
gt2r_freeboard_segment_geoseg_end {
String long_name "Ending GEOSEG";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment";
String origname "geoseg_end";
String fullnamepath "/gt2r/freeboard_segment/geoseg_end";
String coordinates "gt2r_freeboard_segment_delta_time gt2r_freeboard_segment_latitude gt2r_freeboard_segment_longitude";
}
gt2r_freeboard_segment_beam_fb_quality_flag {
String units "1";
String long_name "Flag describing the quality of the freeboard estimate";
String source "ATBD section 5";
Int16 valid_min -1;
Int16 valid_max 5;
String contentType "referenceInformation";
String description "Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor).";
String flag_meanings "invalid best high med low poor";
Int16 flag_values -1, 1, 2, 3, 4, 5;
String origname "beam_fb_quality_flag";
String fullnamepath "/gt2r/freeboard_segment/beam_fb_quality_flag";
String coordinates "gt2r_freeboard_segment_delta_time gt2r_freeboard_segment_latitude gt2r_freeboard_segment_longitude";
}
gt2r_reference_surface_section_beam_refsurf_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface height sigma";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface height sigma (standard deviation) - weighted combination of lead sigmas in this beam for this swath segment";
String origname "beam_refsurf_sigma";
String fullnamepath "/gt2r/reference_surface_section/beam_refsurf_sigma";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_beam_refsurf_alongtrack_slope {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface along track slope";
String units "degrees";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface height along track slope";
String origname "beam_refsurf_alongtrack_slope";
String fullnamepath "/gt2r/reference_surface_section/beam_refsurf_alongtrack_slope";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_beam_lead_ndx {
String long_name "index first lead";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "1-based index to the first /GTx/leads lead used for this beam's reference surface.";
String origname "beam_lead_ndx";
String fullnamepath "/gt2r/reference_surface_section/beam_lead_ndx";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_beam_refsurf_mss {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section Mean Sea Surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Mean sea surface height above WGS-84 reference ellipsoid at reference surface length scale, sampled from height_segment_mss (tide free).";
String origname "beam_refsurf_mss";
String fullnamepath "/gt2r/reference_surface_section/beam_refsurf_mss";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_beam_fb_hist_refsurf {
String long_name "Reference surface section freeboard histogram";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Reference surface freeboard histogram (distribution) for this reference surface section";
String origname "beam_fb_hist_refsurf";
String fullnamepath "/gt2r/reference_surface_section/beam_fb_hist_refsurf";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_beam_refsurf_geoid {
Float32 _FillValue 3.402823466e+38;
String long_name "reference surface section mean EGM2008 Geoid";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geoid height above WGS-84 reference ellipsoid at the reference surface length scale (range -107 to 86m), based on the EGM2008 model. The geoid height is in the tide-free system.";
String origname "beam_refsurf_geoid";
String fullnamepath "/gt2r/reference_surface_section/beam_refsurf_geoid";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_beam_refsurf_interp_flag {
String long_name "Reference surface section interpolation flag";
String units "1";
String source "ATBD section 5";
Int16 valid_min -1;
Int16 valid_max 3;
String contentType "referenceInformation";
String description "Identifies reference surface sections with reference surface height filled through interpolation. -1 = no valid reference surface determined; 0= reference surface computed from leads in this swath; 1 = reference surface computed by interpolation using two valid reference surface (constrained by thresholds maxgaptime and maxgapht); 2 = reference surface computed using one-point fill (linear interpolation between two adjacent valid reference surfaces, constrained by threshold maxpadtime); 3 = reference surface computed using end-point fill (missing reference surface is set to the previous or next adjacent valid reference surface, constrained by threshold maxpadtime)";
String flag_meanings "no_surf leads_in_swath inferred one-point_fill end-point_fill";
Int16 flag_values -1, 0, 1, 2, 3;
String origname "beam_refsurf_interp_flag";
String fullnamepath "/gt2r/reference_surface_section/beam_refsurf_interp_flag";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_beam_refsurf_geoid_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface geoid free-to-mean conversion";
String standard_name "geoid free2mean";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system at reference surface length scale.";
String origname "beam_refsurf_geoid_free2mean";
String fullnamepath "/gt2r/reference_surface_section/beam_refsurf_geoid_free2mean";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_longitude {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Center longitude of reference surface section";
String standard_name "longitude";
String units "degrees_east";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center longitude of reference surface section (mean of all freeboard longitudes)";
String origname "longitude";
String fullnamepath "/gt2r/reference_surface_section/longitude";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude";
}
gt2r_reference_surface_section_beam_refsurf_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section height mean";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface section mean height - weighted combination of leads in this beam for this reference surface section. The reference surface height is relative to the tide-free MSS.";
String origname "beam_refsurf_height";
String fullnamepath "/gt2r/reference_surface_section/beam_refsurf_height";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_latitude {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Center latitude of reference surface section";
String standard_name "latitude";
String units "degrees_north";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center latitude of reference surface section (mean of all freeboard latitudes)";
String origname "latitude";
String fullnamepath "/gt2r/reference_surface_section/latitude";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_beam_refsurf_earth_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section solid earth tide free-to-mean conversion";
String standard_name "solid earth tide free2mean";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Additive value to convert solid earth tide from the tide-free system to the mean-tide system at reference surface length scale.";
String origname "beam_refsurf_earth_free2mean";
String fullnamepath "/gt2r/reference_surface_section/beam_refsurf_earth_free2mean";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_beam_fb_unc_refsurf {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean freeboard uncertainty";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Freeboard uncertainty estimate from the reference surface section mean freeboard, sampled from beam_freeboard/beam_fb_unc";
String origname "beam_fb_unc_refsurf";
String fullnamepath "/gt2r/reference_surface_section/beam_fb_unc_refsurf";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_beam_fb_length_refsurf_sum {
Float32 _FillValue 3.402823466e+38;
String long_name "Total length of freeboard segments";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Length of freeboard beam-segments within this reference surface section";
String origname "beam_fb_length_refsurf_sum";
String fullnamepath "/gt2r/reference_surface_section/beam_fb_length_refsurf_sum";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_fbswath_ndx {
String long_name "Index to freeboard swath segment";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "The 1-based fbswath_nx identifies the swath associated with each element. There are the same number of elements in the group /freeboard_swath_segment and in each of the /GTx/freeboard_beam_segment groups. The fbswath_nx identifies the fbswath_refsurf_height used to compute the fbswath_fb_height. It is the same index number that idenitifies the beam_refsurf_height to its swath and the beam_refsurf_height used to computed the beam_fb_height.";
String origname "fbswath_ndx";
String fullnamepath "/gt2r/reference_surface_section/fbswath_ndx";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_beam_refsurf_dist_x {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Along track distance";
String standard_name "distance";
String units "m";
String source "atl07";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing. Distance is calculated by averaging distance of all leads contained in reference surface.";
String origname "beam_refsurf_dist_x";
String fullnamepath "/gt2r/reference_surface_section/beam_refsurf_dist_x";
String coordinates "gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_beam_fb_refsurf {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean reference surface section freeboard";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Mean segment length weighted reference surface freeboard.";
String origname "beam_fb_refsurf";
String fullnamepath "/gt2r/reference_surface_section/beam_fb_refsurf";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_reference_surface_section_beam_lead_n {
String long_name "Number of leads";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Number of leads used for this beam reference surface section";
String origname "beam_lead_n";
String fullnamepath "/gt2r/reference_surface_section/beam_lead_n";
String coordinates "gt2r_reference_surface_section_delta_time gt2r_reference_surface_section_latitude gt2r_reference_surface_section_longitude";
}
gt2r_leads_lead_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead sigma estimate";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Lead height sigma (standard deviation) estimate - weighted combination of sea surface height sigmas used as leads in this beam for this swath segment";
String origname "lead_sigma";
String fullnamepath "/gt2r/leads/lead_sigma";
String coordinates "gt2r_leads_delta_time gt2r_leads_latitude gt2r_leads_longitude";
}
gt2r_leads_lead_dist_x {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Along Track Distance";
String standard_name "distance";
String units "m";
String source "atl07";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing. Distance is calculated by averaging distance of all ssh segments contained in lead.";
String origname "lead_dist_x";
String fullnamepath "/gt2r/leads/lead_dist_x";
String coordinates "gt2r_leads_latitude gt2r_leads_longitude";
}
gt2r_leads_longitude {
String long_name "Center longitude of lead";
String standard_name "longitude";
String units "degrees_east";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center longitude of lead (mean of all freeboard longitudes)";
String origname "longitude";
String fullnamepath "/gt2r/leads/longitude";
String coordinates "gt2r_leads_delta_time gt2r_leads_latitude";
}
gt2r_leads_latitude {
String long_name "Center latitude of lead";
String standard_name "latitude";
String units "degrees_north";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center latitude of lead (mean of all sea surface height latitudes)";
String origname "latitude";
String fullnamepath "/gt2r/leads/latitude";
String coordinates "gt2r_leads_delta_time gt2r_leads_longitude";
}
gt2r_leads_lead_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead height";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Lead height - weighted mean of consective sea surface heights used for this lead. The lead height is relative to the tide-free MSS.";
String origname "lead_height";
String fullnamepath "/gt2r/leads/lead_height";
String coordinates "gt2r_leads_delta_time gt2r_leads_latitude gt2r_leads_longitude";
}
gt2r_leads_ssh_ndx {
String long_name "index first sea surface";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "1-based index to the first freeboard element (i.e.first sea surface height segment) used for this lead";
String origname "ssh_ndx";
String fullnamepath "/gt2r/leads/ssh_ndx";
String coordinates "gt2r_leads_delta_time gt2r_leads_latitude gt2r_leads_longitude";
}
gt2r_leads_ssh_n {
String long_name "number of sea surface references";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Number of sea surface height segments used for this lead";
String origname "ssh_n";
String fullnamepath "/gt2r/leads/ssh_n";
String coordinates "gt2r_leads_delta_time gt2r_leads_latitude gt2r_leads_longitude";
}
gt2r_leads_lead_length {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead size";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Along-track length of this lead";
String origname "lead_length";
String fullnamepath "/gt2r/leads/lead_length";
String coordinates "gt2r_leads_delta_time gt2r_leads_latitude gt2r_leads_longitude";
}
gt1l_freeboard_segment_heights_msw_flag {
String long_name "multiple scattering warning flag";
String units "1";
String source "ATL09";
Int16 valid_min -1;
Int16 valid_max 5;
String contentType "modelResult";
String description "Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight.";
String flag_meanings "cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5";
Int16 flag_values -1, 0, 1, 2, 3, 4, 5;
String origname "msw_flag";
String fullnamepath "/gt1l/freeboard_segment/heights/msw_flag";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_cloud_flag_atm {
String long_name "cloud flag atm";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 10;
String contentType "modelResult";
String description "Number of layers found from the backscatter profile using the DDA layer finder";
String origname "cloud_flag_atm";
String fullnamepath "/gt1l/freeboard_segment/heights/cloud_flag_atm";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_height_segment_length_seg {
Float32 _FillValue 3.402823466e+38;
String long_name "length of segment";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Along-track length of segment containing n_photons_actual (ATL07 length_seg)";
String origname "height_segment_length_seg";
String fullnamepath "/gt1l/freeboard_segment/heights/height_segment_length_seg";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_bsnow_con {
Float32 _FillValue 3.402823466e+38;
String long_name "Blowing snow confidence";
String units "1";
String source "ATL09";
String contentType "modelResult";
String description "Blowing snow confidence";
String origname "bsnow_con";
String fullnamepath "/gt1l/freeboard_segment/heights/bsnow_con";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_layer_flag {
String long_name "consolidated cloud flag";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 1;
String contentType "modelResult";
String description "This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow.";
String flag_meanings "likely_clear likely_cloudy";
Int16 flag_values 0, 1;
String origname "layer_flag";
String fullnamepath "/gt1l/freeboard_segment/heights/layer_flag";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_backgr_calc {
Float32 _FillValue 3.402823466e+38;
String long_name "background count rate calculated";
String units "hz";
String source "ATL07";
String contentType "modelResult";
String description "Calculated background count rate based on sun angle, surface slope, unit reflectance";
String origname "backgr_calc";
String fullnamepath "/gt1l/freeboard_segment/heights/backgr_calc";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_ice_conc_amsr2 {
Float32 _FillValue 3.402823466e+38;
String long_name "sea ice concentration from AMSR2 file";
String units "1";
String source "ATL07/ANC31";
String contentType "modelResult";
String description "Sea ice concentration from daily AMSR2 sea ice concentration file (ANC49)";
String origname "ice_conc_amsr2";
String fullnamepath "/gt1l/freeboard_segment/heights/ice_conc_amsr2";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_bsnow_h {
Float32 _FillValue 3.402823466e+38;
String long_name "Blowing snow top height";
String units "meters";
String source "ATL09";
String contentType "modelResult";
String description "Blowing snow layer top height";
String origname "bsnow_h";
String fullnamepath "/gt1l/freeboard_segment/heights/bsnow_h";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+, Lon of segment center";
String origname "longitude";
String fullnamepath "/gt1l/freeboard_segment/heights/longitude";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude";
}
gt1l_freeboard_segment_heights_height_segment_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "h surface sigma";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Sigma height surface error estimate - width of the trimmed histogram divided by the number of photons.";
String origname "height_segment_sigma";
String fullnamepath "/gt1l/freeboard_segment/heights/height_segment_sigma";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_background_r_norm {
Float32 _FillValue 3.402823466e+38;
String long_name "normalized background (50 shot)";
String units "hz";
String source "ATL07";
String contentType "modelResult";
String description "Background rate normalized to a fixed solar elevation angle";
String origname "background_r_norm";
String fullnamepath "/gt1l/freeboard_segment/heights/background_r_norm";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of segment center";
String origname "latitude";
String fullnamepath "/gt1l/freeboard_segment/heights/latitude";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_height_segment_ocdepth {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment ocean depth";
String standard_name "ocdepth";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Height segment ocean depth";
String origname "height_segment_ocdepth";
String fullnamepath "/gt1l/freeboard_segment/heights/height_segment_ocdepth";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_height_segment_dist2land {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment distance to land";
String standard_name "dist2land";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Height segment distance to land";
String origname "height_segment_dist2land";
String fullnamepath "/gt1l/freeboard_segment/heights/height_segment_dist2land";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_cloud_flag_asr {
String long_name "cloud flag asr";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 5;
String contentType "modelResult";
String description "Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence";
String flag_meanings "clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence";
Int16 flag_values 0, 1, 2, 3, 4, 5;
String origname "cloud_flag_asr";
String fullnamepath "/gt1l/freeboard_segment/heights/cloud_flag_asr";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_ice_conc_ssmi {
Float32 _FillValue 3.402823466e+38;
String long_name "sea ice concentration";
String units "1";
String source "ATL07/ANC31";
String contentType "modelResult";
String description "Sea ice concentration from daily SSMI sea ice concentration file (ANC31)";
String origname "ice_conc_ssmi";
String fullnamepath "/gt1l/freeboard_segment/heights/ice_conc_ssmi";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_height_segment_ssh_flag {
String long_name "Sea Surface Height Flag";
String units "1";
String source "Sea Ice ATBD";
Int16 valid_min 0;
Int16 valid_max 2;
String contentType "referenceInformation";
String description "Identifiesthe height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. The flags are set as follows: 0 = sea ice; 1 = potential reference sea surface height; 2 = used in calculating reference sea surface height";
String flag_meanings "sea_ice potential_sea_ice_surface new_meaning";
Int16 flag_values 0, 1, 2;
String origname "height_segment_ssh_flag";
String fullnamepath "/gt1l/freeboard_segment/heights/height_segment_ssh_flag";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_podppd_flag {
String long_name "POD_PPD Flag";
String units "1";
String source "ATL07, ATL03, ATL02, ANC04, ANC05";
Int16 valid_min 0;
Int16 valid_max 7;
String contentType "referenceInformation";
String description "Composite POD/PPD flag that indicates the quality of input geolocation products for the specific height_segment. Value for height segment is sampled from geolocation parameter on ATL03. A non-zero value may indicate that geolocation solutions are degraded or that ATLAS is within a calibration scan period (CAL). Possible non-CAL values are: 0=Nominal; 1=POD_DEGRADE; 2=PPD_DEGRADE; 3=PODPPD_DEGRADE; possible CAL values are: 4=CAL_NOMINAL; 5=CAL_POD_DEGRADE; 6=CAL_PPD_DEGRADE; 7=CAL_PODPPD_DEGRADE. (ATL07 podppd_flag)";
String flag_meanings "nominal pod_degrade ppd_degrade podppd_degrade cal_nominal cal_pod_degrade cal_ppd_degrade new_meaning";
Int16 flag_values 0, 1, 2, 3, 4, 5, 6, 7;
String origname "podppd_flag";
String fullnamepath "/gt1l/freeboard_segment/heights/podppd_flag";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_backgr_r_200 {
Float32 _FillValue 3.402823466e+38;
String long_name "background rate 200 hz";
String units "hz";
String source "ATL09";
String contentType "modelResult";
String description "Background count rate, averaged over the segment based on ATLAS 50 pulse counts";
String origname "backgr_r_200";
String fullnamepath "/gt1l/freeboard_segment/heights/backgr_r_200";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_height_segment_height {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Mean height from along-track segment fit determined by the sea ice algorithm(ATL07 h_si). The sea ice height is relative to the tide-free MSS.";
String origname "height_segment_height";
String fullnamepath "/gt1l/freeboard_segment/heights/height_segment_height";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_height_segment_type {
String long_name "Segment surface type";
String units "1";
String source "ATBD section 4.3";
Int16 valid_min -1;
Int16 valid_max 9;
String contentType "referenceInformation";
String description "Value that indicates segment surface type as sea ice or different types of sea surface. (0=cloud covered)";
String flag_meanings "cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough new_meaning";
Int16 flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1;
String origname "height_segment_type";
String fullnamepath "/gt1l/freeboard_segment/heights/height_segment_type";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_height_segment_confidence {
Float32 _FillValue 3.402823466e+38;
String long_name "Surface height confidence";
String units "1";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis (ATL07 h_confidence)";
String origname "height_segment_confidence";
String fullnamepath "/gt1l/freeboard_segment/heights/height_segment_confidence";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_asr_25 {
Float32 _FillValue 3.402823466e+38;
String long_name "Apparent surface reflectance at 25 hz";
String units "1";
String source "ATL07";
String contentType "modelResult";
String description "Apparent surface reflectance at 25 hz, average to the sea ice segment";
String origname "asr_25";
String fullnamepath "/gt1l/freeboard_segment/heights/asr_25";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_height_segment_w_gaussian {
Float32 _FillValue 3.402823466e+38;
String long_name "width of best fit gaussian";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Width of best fit gaussian (ATL07 w_gaussian)";
String origname "height_segment_w_gaussian";
String fullnamepath "/gt1l/freeboard_segment/heights/height_segment_w_gaussian";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_photon_rate {
Float32 _FillValue 3.402823466e+38;
String long_name "photon rate";
String units "1";
String source "ATL07";
String contentType "modelResult";
String description "Photon count rate, averaged over sea ice segment.";
String origname "photon_rate";
String fullnamepath "/gt1l/freeboard_segment/heights/photon_rate";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_backgr_r_25 {
Float32 _FillValue 3.402823466e+38;
String long_name "background rate 25 hz";
String units "hz";
String source "ATL09";
String contentType "modelResult";
String description "Background count rate, averaged over the segment based on 25 hz atmosphere";
String origname "backgr_r_25";
String fullnamepath "/gt1l/freeboard_segment/heights/backgr_r_25";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_heights_height_segment_rms {
Float32 _FillValue 3.402823466e+38;
String long_name "height rms";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "RMS difference between sea ice modeled and observed photon height distribution (ATL07 h_rms)";
String origname "height_segment_rms";
String fullnamepath "/gt1l/freeboard_segment/heights/height_segment_rms";
String coordinates "gt1l_freeboard_segment_heights_delta_time gt1l_freeboard_segment_heights_latitude gt1l_freeboard_segment_heights_longitude";
}
gt1l_freeboard_segment_height_segment_id {
String units "1";
String long_name "Identifier of each height segment";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Identifier of each height segment";
String origname "height_segment_id";
String fullnamepath "/gt1l/freeboard_segment/height_segment_id";
String coordinates "gt1l_freeboard_segment_delta_time gt1l_freeboard_segment_latitude gt1l_freeboard_segment_longitude";
}
gt1l_freeboard_segment_beam_fb_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard height relative to beam_refsurf_height";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Freeboard height based on ATL07 ice surface height relative to beam_refsurf_height.";
String origname "beam_fb_height";
String fullnamepath "/gt1l/freeboard_segment/beam_fb_height";
String coordinates "gt1l_freeboard_segment_delta_time gt1l_freeboard_segment_latitude gt1l_freeboard_segment_longitude";
}
gt1l_freeboard_segment_beam_fb_unc {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard segment uncertainty";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Combined uncertainty from the height segment sigma and the reference surface sigma estimates";
String origname "beam_fb_unc";
String fullnamepath "/gt1l/freeboard_segment/beam_fb_unc";
String coordinates "gt1l_freeboard_segment_delta_time gt1l_freeboard_segment_latitude gt1l_freeboard_segment_longitude";
}
gt1l_freeboard_segment_seg_dist_x {
String long_name "Along track distance";
String units "meters";
String source "Sea Ice ATBD";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing to the segment center.";
String origname "seg_dist_x";
String fullnamepath "/gt1l/freeboard_segment/seg_dist_x";
String coordinates "gt1l_freeboard_segment_delta_time gt1l_freeboard_segment_latitude gt1l_freeboard_segment_longitude";
}
gt1l_freeboard_segment_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+, Lon of freeboard segment center";
String origname "longitude";
String fullnamepath "/gt1l/freeboard_segment/longitude";
String coordinates "gt1l_freeboard_segment_delta_time gt1l_freeboard_segment_latitude";
}
gt1l_freeboard_segment_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of freeboard segment center";
String origname "latitude";
String fullnamepath "/gt1l/freeboard_segment/latitude";
String coordinates "gt1l_freeboard_segment_delta_time gt1l_freeboard_segment_longitude";
}
gt1l_freeboard_segment_beam_refsurf_ndx {
String long_name "Index to beam refsur";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "1-based index to reference surface used for this freeboard height. Its value is identical to the fbswath_ndx. This index also identifies the beam section with which the beam freeboard associated.";
String origname "beam_refsurf_ndx";
String fullnamepath "/gt1l/freeboard_segment/beam_refsurf_ndx";
String coordinates "gt1l_freeboard_segment_delta_time gt1l_freeboard_segment_latitude gt1l_freeboard_segment_longitude";
}
gt1l_freeboard_segment_geophysical_height_segment_dac {
Float32 _FillValue 3.402823466e+38;
String long_name "Dynamic Atmosphere Correction";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect (From ATL07)";
String origname "height_segment_dac";
String fullnamepath "/gt1l/freeboard_segment/geophysical/height_segment_dac";
String coordinates "gt1l_freeboard_segment_geophysical_delta_time gt1l_freeboard_segment_geophysical_latitude gt1l_freeboard_segment_geophysical_longitude";
}
gt1l_freeboard_segment_geophysical_height_segment_tide_pole {
Float32 _FillValue 3.402823466e+38;
String long_name "Pole Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). (From ATL07)";
String origname "height_segment_tide_pole";
String fullnamepath "/gt1l/freeboard_segment/geophysical/height_segment_tide_pole";
String coordinates "gt1l_freeboard_segment_geophysical_delta_time gt1l_freeboard_segment_geophysical_latitude gt1l_freeboard_segment_geophysical_longitude";
}
gt1l_freeboard_segment_geophysical_height_segment_ib {
Float32 _FillValue 3.402823466e+38;
String long_name "inverted barometer effect";
String units "meters";
String source "ATBD section 4.2";
String contentType "referenceInformation";
String description "Inverted barometer effect calculated from surface pressure";
String origname "height_segment_ib";
String fullnamepath "/gt1l/freeboard_segment/geophysical/height_segment_ib";
String coordinates "gt1l_freeboard_segment_geophysical_delta_time gt1l_freeboard_segment_geophysical_latitude gt1l_freeboard_segment_geophysical_longitude";
}
gt1l_freeboard_segment_geophysical_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+,Lon of segment center";
String origname "longitude";
String fullnamepath "/gt1l/freeboard_segment/geophysical/longitude";
String coordinates "gt1l_freeboard_segment_geophysical_delta_time gt1l_freeboard_segment_geophysical_latitude";
}
gt1l_freeboard_segment_geophysical_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of segment center";
String origname "latitude";
String fullnamepath "/gt1l/freeboard_segment/geophysical/latitude";
String coordinates "gt1l_freeboard_segment_geophysical_delta_time gt1l_freeboard_segment_geophysical_longitude";
}
gt1l_freeboard_segment_geophysical_height_segment_load {
String units "meters";
Float32 _FillValue 3.402823466e+38;
String long_name "Load Tide";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). (From ATL07)";
String origname "height_segment_load";
String fullnamepath "/gt1l/freeboard_segment/geophysical/height_segment_load";
String coordinates "gt1l_freeboard_segment_geophysical_delta_time gt1l_freeboard_segment_geophysical_latitude gt1l_freeboard_segment_geophysical_longitude";
}
gt1l_freeboard_segment_geophysical_height_segment_geoid {
Float32 _FillValue 3.402823466e+38;
String long_name "EGM2008 Geoid";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model (From ATL07). The geoid height is in the tide-free system.";
String origname "height_segment_geoid";
String fullnamepath "/gt1l/freeboard_segment/geophysical/height_segment_geoid";
String coordinates "gt1l_freeboard_segment_geophysical_delta_time gt1l_freeboard_segment_geophysical_latitude gt1l_freeboard_segment_geophysical_longitude";
}
gt1l_freeboard_segment_geophysical_height_segment_ocean {
Float32 _FillValue 3.402823466e+38;
String long_name "Ocean Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium).";
String origname "height_segment_ocean";
String fullnamepath "/gt1l/freeboard_segment/geophysical/height_segment_ocean";
String coordinates "gt1l_freeboard_segment_geophysical_delta_time gt1l_freeboard_segment_geophysical_latitude gt1l_freeboard_segment_geophysical_longitude";
}
gt1l_freeboard_segment_geophysical_height_segment_dynib {
Float32 _FillValue 3.402823466e+38;
String long_name "Dynamic inverted barometer effect";
String standard_name "dynamic inverted barometer";
String units "meters";
String source "ATBD section 4.2";
String contentType "referenceInformation";
String description "Inverted barometer effect calculated from dynamic mean ocean sea level pressure (computed using ANC10 and ANC48, /ancillary_data/freeboard_estimation/mean_ocean_slp)";
String origname "height_segment_dynib";
String fullnamepath "/gt1l/freeboard_segment/geophysical/height_segment_dynib";
String coordinates "gt1l_freeboard_segment_geophysical_delta_time gt1l_freeboard_segment_geophysical_latitude gt1l_freeboard_segment_geophysical_longitude";
}
gt1l_freeboard_segment_geophysical_height_segment_earth_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Earth Tide Free-to-Mean conversion";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Additive value to convert solid earth tide from the tide-free system to the mean-tide system. (Add to height_segment_earth to get the solid earth tides in the mean-tide system.)";
String origname "height_segment_earth_free2mean";
String fullnamepath "/gt1l/freeboard_segment/geophysical/height_segment_earth_free2mean";
String coordinates "gt1l_freeboard_segment_geophysical_delta_time gt1l_freeboard_segment_geophysical_latitude gt1l_freeboard_segment_geophysical_longitude";
}
gt1l_freeboard_segment_geophysical_height_segment_geoid_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "EGM2008 Geoid Free-to-Mean conversion";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system. (Add to height_segment_geoid to get the geoid heights in the mean-tide system.)";
String origname "height_segment_geoid_free2mean";
String fullnamepath "/gt1l/freeboard_segment/geophysical/height_segment_geoid_free2mean";
String coordinates "gt1l_freeboard_segment_geophysical_delta_time gt1l_freeboard_segment_geophysical_latitude gt1l_freeboard_segment_geophysical_longitude";
}
gt1l_freeboard_segment_geophysical_height_segment_mss {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean Sea Surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Mean sea surface height above WGS-84 reference ellipsoid (range: -68 to 65m), based on a CryoSat-2/DTU14 merged product (https://doi.org/10.5281/zenodo.4294047). The MSS height (from ANC15 used in atlas_l3a_si processing) is adjusted to be in a tide free reference system (subtracting the geoid_free2mean correction) to be consistent with the tide free ATL03 heights.";
String origname "height_segment_mss";
String fullnamepath "/gt1l/freeboard_segment/geophysical/height_segment_mss";
String coordinates "gt1l_freeboard_segment_geophysical_delta_time gt1l_freeboard_segment_geophysical_latitude gt1l_freeboard_segment_geophysical_longitude";
}
gt1l_freeboard_segment_geophysical_height_segment_lpe {
Float32 _FillValue 3.402823466e+38;
String long_name "Equilibrium Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Long period equilibrium tide self-consistent with ocean tide model (+-0.04m).";
String origname "height_segment_lpe";
String fullnamepath "/gt1l/freeboard_segment/geophysical/height_segment_lpe";
String coordinates "gt1l_freeboard_segment_geophysical_delta_time gt1l_freeboard_segment_geophysical_latitude gt1l_freeboard_segment_geophysical_longitude";
}
gt1l_freeboard_segment_geophysical_height_segment_earth {
String units "meters";
Float32 _FillValue 3.402823466e+38;
String long_name "Earth Tide";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Solid Earth Tide (From ATL07). The solid earth tide height is in the tide-free system.";
String origname "height_segment_earth";
String fullnamepath "/gt1l/freeboard_segment/geophysical/height_segment_earth";
String coordinates "gt1l_freeboard_segment_geophysical_delta_time gt1l_freeboard_segment_geophysical_latitude gt1l_freeboard_segment_geophysical_longitude";
}
gt1l_freeboard_segment_geoseg_beg {
String long_name "Beginning GEOSEG";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment";
String origname "geoseg_beg";
String fullnamepath "/gt1l/freeboard_segment/geoseg_beg";
String coordinates "gt1l_freeboard_segment_delta_time gt1l_freeboard_segment_latitude gt1l_freeboard_segment_longitude";
}
gt1l_freeboard_segment_beam_fb_confidence {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard confidence";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Confidence level in the freeboard estimate";
String origname "beam_fb_confidence";
String fullnamepath "/gt1l/freeboard_segment/beam_fb_confidence";
String coordinates "gt1l_freeboard_segment_delta_time gt1l_freeboard_segment_latitude gt1l_freeboard_segment_longitude";
}
gt1l_freeboard_segment_geoseg_end {
String long_name "Ending GEOSEG";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment";
String origname "geoseg_end";
String fullnamepath "/gt1l/freeboard_segment/geoseg_end";
String coordinates "gt1l_freeboard_segment_delta_time gt1l_freeboard_segment_latitude gt1l_freeboard_segment_longitude";
}
gt1l_freeboard_segment_beam_fb_quality_flag {
String units "1";
String long_name "Flag describing the quality of the freeboard estimate";
String source "ATBD section 5";
Int16 valid_min -1;
Int16 valid_max 5;
String contentType "referenceInformation";
String description "Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor).";
String flag_meanings "invalid best high med low poor";
Int16 flag_values -1, 1, 2, 3, 4, 5;
String origname "beam_fb_quality_flag";
String fullnamepath "/gt1l/freeboard_segment/beam_fb_quality_flag";
String coordinates "gt1l_freeboard_segment_delta_time gt1l_freeboard_segment_latitude gt1l_freeboard_segment_longitude";
}
gt1l_reference_surface_section_beam_refsurf_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface height sigma";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface height sigma (standard deviation) - weighted combination of lead sigmas in this beam for this swath segment";
String origname "beam_refsurf_sigma";
String fullnamepath "/gt1l/reference_surface_section/beam_refsurf_sigma";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_beam_refsurf_alongtrack_slope {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface along track slope";
String units "degrees";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface height along track slope";
String origname "beam_refsurf_alongtrack_slope";
String fullnamepath "/gt1l/reference_surface_section/beam_refsurf_alongtrack_slope";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_beam_lead_ndx {
String long_name "index first lead";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "1-based index to the first /GTx/leads lead used for this beam's reference surface.";
String origname "beam_lead_ndx";
String fullnamepath "/gt1l/reference_surface_section/beam_lead_ndx";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_beam_refsurf_mss {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section Mean Sea Surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Mean sea surface height above WGS-84 reference ellipsoid at reference surface length scale, sampled from height_segment_mss (tide free).";
String origname "beam_refsurf_mss";
String fullnamepath "/gt1l/reference_surface_section/beam_refsurf_mss";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_beam_fb_hist_refsurf {
String long_name "Reference surface section freeboard histogram";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Reference surface freeboard histogram (distribution) for this reference surface section";
String origname "beam_fb_hist_refsurf";
String fullnamepath "/gt1l/reference_surface_section/beam_fb_hist_refsurf";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_beam_refsurf_geoid {
Float32 _FillValue 3.402823466e+38;
String long_name "reference surface section mean EGM2008 Geoid";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geoid height above WGS-84 reference ellipsoid at the reference surface length scale (range -107 to 86m), based on the EGM2008 model. The geoid height is in the tide-free system.";
String origname "beam_refsurf_geoid";
String fullnamepath "/gt1l/reference_surface_section/beam_refsurf_geoid";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_beam_refsurf_interp_flag {
String long_name "Reference surface section interpolation flag";
String units "1";
String source "ATBD section 5";
Int16 valid_min -1;
Int16 valid_max 3;
String contentType "referenceInformation";
String description "Identifies reference surface sections with reference surface height filled through interpolation. -1 = no valid reference surface determined; 0= reference surface computed from leads in this swath; 1 = reference surface computed by interpolation using two valid reference surface (constrained by thresholds maxgaptime and maxgapht); 2 = reference surface computed using one-point fill (linear interpolation between two adjacent valid reference surfaces, constrained by threshold maxpadtime); 3 = reference surface computed using end-point fill (missing reference surface is set to the previous or next adjacent valid reference surface, constrained by threshold maxpadtime)";
String flag_meanings "no_surf leads_in_swath inferred one-point_fill end-point_fill";
Int16 flag_values -1, 0, 1, 2, 3;
String origname "beam_refsurf_interp_flag";
String fullnamepath "/gt1l/reference_surface_section/beam_refsurf_interp_flag";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_beam_refsurf_geoid_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface geoid free-to-mean conversion";
String standard_name "geoid free2mean";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system at reference surface length scale.";
String origname "beam_refsurf_geoid_free2mean";
String fullnamepath "/gt1l/reference_surface_section/beam_refsurf_geoid_free2mean";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_longitude {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Center longitude of reference surface section";
String standard_name "longitude";
String units "degrees_east";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center longitude of reference surface section (mean of all freeboard longitudes)";
String origname "longitude";
String fullnamepath "/gt1l/reference_surface_section/longitude";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude";
}
gt1l_reference_surface_section_beam_refsurf_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section height mean";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface section mean height - weighted combination of leads in this beam for this reference surface section. The reference surface height is relative to the tide-free MSS.";
String origname "beam_refsurf_height";
String fullnamepath "/gt1l/reference_surface_section/beam_refsurf_height";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_latitude {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Center latitude of reference surface section";
String standard_name "latitude";
String units "degrees_north";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center latitude of reference surface section (mean of all freeboard latitudes)";
String origname "latitude";
String fullnamepath "/gt1l/reference_surface_section/latitude";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_beam_refsurf_earth_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section solid earth tide free-to-mean conversion";
String standard_name "solid earth tide free2mean";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Additive value to convert solid earth tide from the tide-free system to the mean-tide system at reference surface length scale.";
String origname "beam_refsurf_earth_free2mean";
String fullnamepath "/gt1l/reference_surface_section/beam_refsurf_earth_free2mean";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_beam_fb_unc_refsurf {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean freeboard uncertainty";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Freeboard uncertainty estimate from the reference surface section mean freeboard, sampled from beam_freeboard/beam_fb_unc";
String origname "beam_fb_unc_refsurf";
String fullnamepath "/gt1l/reference_surface_section/beam_fb_unc_refsurf";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_beam_fb_length_refsurf_sum {
Float32 _FillValue 3.402823466e+38;
String long_name "Total length of freeboard segments";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Length of freeboard beam-segments within this reference surface section";
String origname "beam_fb_length_refsurf_sum";
String fullnamepath "/gt1l/reference_surface_section/beam_fb_length_refsurf_sum";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_fbswath_ndx {
String long_name "Index to freeboard swath segment";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "The 1-based fbswath_nx identifies the swath associated with each element. There are the same number of elements in the group /freeboard_swath_segment and in each of the /GTx/freeboard_beam_segment groups. The fbswath_nx identifies the fbswath_refsurf_height used to compute the fbswath_fb_height. It is the same index number that idenitifies the beam_refsurf_height to its swath and the beam_refsurf_height used to computed the beam_fb_height.";
String origname "fbswath_ndx";
String fullnamepath "/gt1l/reference_surface_section/fbswath_ndx";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_beam_refsurf_dist_x {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Along track distance";
String standard_name "distance";
String units "m";
String source "atl07";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing. Distance is calculated by averaging distance of all leads contained in reference surface.";
String origname "beam_refsurf_dist_x";
String fullnamepath "/gt1l/reference_surface_section/beam_refsurf_dist_x";
String coordinates "gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_beam_fb_refsurf {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean reference surface section freeboard";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Mean segment length weighted reference surface freeboard.";
String origname "beam_fb_refsurf";
String fullnamepath "/gt1l/reference_surface_section/beam_fb_refsurf";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_reference_surface_section_beam_lead_n {
String long_name "Number of leads";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Number of leads used for this beam reference surface section";
String origname "beam_lead_n";
String fullnamepath "/gt1l/reference_surface_section/beam_lead_n";
String coordinates "gt1l_reference_surface_section_delta_time gt1l_reference_surface_section_latitude gt1l_reference_surface_section_longitude";
}
gt1l_leads_lead_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead sigma estimate";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Lead height sigma (standard deviation) estimate - weighted combination of sea surface height sigmas used as leads in this beam for this swath segment";
String origname "lead_sigma";
String fullnamepath "/gt1l/leads/lead_sigma";
String coordinates "gt1l_leads_delta_time gt1l_leads_latitude gt1l_leads_longitude";
}
gt1l_leads_lead_dist_x {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Along Track Distance";
String standard_name "distance";
String units "m";
String source "atl07";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing. Distance is calculated by averaging distance of all ssh segments contained in lead.";
String origname "lead_dist_x";
String fullnamepath "/gt1l/leads/lead_dist_x";
String coordinates "gt1l_leads_latitude gt1l_leads_longitude";
}
gt1l_leads_longitude {
String long_name "Center longitude of lead";
String standard_name "longitude";
String units "degrees_east";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center longitude of lead (mean of all freeboard longitudes)";
String origname "longitude";
String fullnamepath "/gt1l/leads/longitude";
String coordinates "gt1l_leads_delta_time gt1l_leads_latitude";
}
gt1l_leads_latitude {
String long_name "Center latitude of lead";
String standard_name "latitude";
String units "degrees_north";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center latitude of lead (mean of all sea surface height latitudes)";
String origname "latitude";
String fullnamepath "/gt1l/leads/latitude";
String coordinates "gt1l_leads_delta_time gt1l_leads_longitude";
}
gt1l_leads_lead_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead height";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Lead height - weighted mean of consective sea surface heights used for this lead. The lead height is relative to the tide-free MSS.";
String origname "lead_height";
String fullnamepath "/gt1l/leads/lead_height";
String coordinates "gt1l_leads_delta_time gt1l_leads_latitude gt1l_leads_longitude";
}
gt1l_leads_ssh_ndx {
String long_name "index first sea surface";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "1-based index to the first freeboard element (i.e.first sea surface height segment) used for this lead";
String origname "ssh_ndx";
String fullnamepath "/gt1l/leads/ssh_ndx";
String coordinates "gt1l_leads_delta_time gt1l_leads_latitude gt1l_leads_longitude";
}
gt1l_leads_ssh_n {
String long_name "number of sea surface references";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Number of sea surface height segments used for this lead";
String origname "ssh_n";
String fullnamepath "/gt1l/leads/ssh_n";
String coordinates "gt1l_leads_delta_time gt1l_leads_latitude gt1l_leads_longitude";
}
gt1l_leads_lead_length {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead size";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Along-track length of this lead";
String origname "lead_length";
String fullnamepath "/gt1l/leads/lead_length";
String coordinates "gt1l_leads_delta_time gt1l_leads_latitude gt1l_leads_longitude";
}
quality_assessment_qa_granule_fail_reason {
String long_name "Granule Failure Reason";
String units "1";
String source "Operations";
Int32 valid_min 0;
Int32 valid_max 5;
String contentType "qualityInformation";
String description "Flag indicating granule failure reason. 0=no failure; 1=processing error; 2=Insufficient output data was generated; 3=TBD Failure; 4=TBD_Failure; 5=other failure.";
String flag_meanings "no_failure PROCESS_ERROR INSUFFICIENT_OUTPUT failure_3 failure_4 OTHER_FAILURE";
Int32 flag_values 0, 1, 2, 3, 4, 5;
String origname "qa_granule_fail_reason";
String fullnamepath "/quality_assessment/qa_granule_fail_reason";
}
quality_assessment_qa_granule_pass_fail {
String long_name "Granule Pass Flag";
String units "1";
String source "Operations";
Int32 valid_min 0;
Int32 valid_max 1;
String contentType "qualityInformation";
String description "Flag indicating granule quality. 0=granule passes automatic QA. 1=granule fails automatic QA.";
String flag_meanings "PASS FAIL";
Int32 flag_values 0, 1;
String origname "qa_granule_pass_fail";
String fullnamepath "/quality_assessment/qa_granule_pass_fail";
}
gt3l_freeboard_segment_heights_msw_flag {
String long_name "multiple scattering warning flag";
String units "1";
String source "ATL09";
Int16 valid_min -1;
Int16 valid_max 5;
String contentType "modelResult";
String description "Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight.";
String flag_meanings "cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5";
Int16 flag_values -1, 0, 1, 2, 3, 4, 5;
String origname "msw_flag";
String fullnamepath "/gt3l/freeboard_segment/heights/msw_flag";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_cloud_flag_atm {
String long_name "cloud flag atm";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 10;
String contentType "modelResult";
String description "Number of layers found from the backscatter profile using the DDA layer finder";
String origname "cloud_flag_atm";
String fullnamepath "/gt3l/freeboard_segment/heights/cloud_flag_atm";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_height_segment_length_seg {
Float32 _FillValue 3.402823466e+38;
String long_name "length of segment";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Along-track length of segment containing n_photons_actual (ATL07 length_seg)";
String origname "height_segment_length_seg";
String fullnamepath "/gt3l/freeboard_segment/heights/height_segment_length_seg";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_bsnow_con {
Float32 _FillValue 3.402823466e+38;
String long_name "Blowing snow confidence";
String units "1";
String source "ATL09";
String contentType "modelResult";
String description "Blowing snow confidence";
String origname "bsnow_con";
String fullnamepath "/gt3l/freeboard_segment/heights/bsnow_con";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_layer_flag {
String long_name "consolidated cloud flag";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 1;
String contentType "modelResult";
String description "This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow.";
String flag_meanings "likely_clear likely_cloudy";
Int16 flag_values 0, 1;
String origname "layer_flag";
String fullnamepath "/gt3l/freeboard_segment/heights/layer_flag";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_backgr_calc {
Float32 _FillValue 3.402823466e+38;
String long_name "background count rate calculated";
String units "hz";
String source "ATL07";
String contentType "modelResult";
String description "Calculated background count rate based on sun angle, surface slope, unit reflectance";
String origname "backgr_calc";
String fullnamepath "/gt3l/freeboard_segment/heights/backgr_calc";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_ice_conc_amsr2 {
Float32 _FillValue 3.402823466e+38;
String long_name "sea ice concentration from AMSR2 file";
String units "1";
String source "ATL07/ANC31";
String contentType "modelResult";
String description "Sea ice concentration from daily AMSR2 sea ice concentration file (ANC49)";
String origname "ice_conc_amsr2";
String fullnamepath "/gt3l/freeboard_segment/heights/ice_conc_amsr2";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_bsnow_h {
Float32 _FillValue 3.402823466e+38;
String long_name "Blowing snow top height";
String units "meters";
String source "ATL09";
String contentType "modelResult";
String description "Blowing snow layer top height";
String origname "bsnow_h";
String fullnamepath "/gt3l/freeboard_segment/heights/bsnow_h";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+, Lon of segment center";
String origname "longitude";
String fullnamepath "/gt3l/freeboard_segment/heights/longitude";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude";
}
gt3l_freeboard_segment_heights_height_segment_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "h surface sigma";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Sigma height surface error estimate - width of the trimmed histogram divided by the number of photons.";
String origname "height_segment_sigma";
String fullnamepath "/gt3l/freeboard_segment/heights/height_segment_sigma";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_background_r_norm {
Float32 _FillValue 3.402823466e+38;
String long_name "normalized background (50 shot)";
String units "hz";
String source "ATL07";
String contentType "modelResult";
String description "Background rate normalized to a fixed solar elevation angle";
String origname "background_r_norm";
String fullnamepath "/gt3l/freeboard_segment/heights/background_r_norm";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of segment center";
String origname "latitude";
String fullnamepath "/gt3l/freeboard_segment/heights/latitude";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_height_segment_ocdepth {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment ocean depth";
String standard_name "ocdepth";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Height segment ocean depth";
String origname "height_segment_ocdepth";
String fullnamepath "/gt3l/freeboard_segment/heights/height_segment_ocdepth";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_height_segment_dist2land {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment distance to land";
String standard_name "dist2land";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Height segment distance to land";
String origname "height_segment_dist2land";
String fullnamepath "/gt3l/freeboard_segment/heights/height_segment_dist2land";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_cloud_flag_asr {
String long_name "cloud flag asr";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 5;
String contentType "modelResult";
String description "Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence";
String flag_meanings "clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence";
Int16 flag_values 0, 1, 2, 3, 4, 5;
String origname "cloud_flag_asr";
String fullnamepath "/gt3l/freeboard_segment/heights/cloud_flag_asr";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_ice_conc_ssmi {
Float32 _FillValue 3.402823466e+38;
String long_name "sea ice concentration";
String units "1";
String source "ATL07/ANC31";
String contentType "modelResult";
String description "Sea ice concentration from daily SSMI sea ice concentration file (ANC31)";
String origname "ice_conc_ssmi";
String fullnamepath "/gt3l/freeboard_segment/heights/ice_conc_ssmi";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_height_segment_ssh_flag {
String long_name "Sea Surface Height Flag";
String units "1";
String source "Sea Ice ATBD";
Int16 valid_min 0;
Int16 valid_max 2;
String contentType "referenceInformation";
String description "Identifiesthe height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. The flags are set as follows: 0 = sea ice; 1 = potential reference sea surface height; 2 = used in calculating reference sea surface height";
String flag_meanings "sea_ice potential_sea_ice_surface new_meaning";
Int16 flag_values 0, 1, 2;
String origname "height_segment_ssh_flag";
String fullnamepath "/gt3l/freeboard_segment/heights/height_segment_ssh_flag";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_podppd_flag {
String long_name "POD_PPD Flag";
String units "1";
String source "ATL07, ATL03, ATL02, ANC04, ANC05";
Int16 valid_min 0;
Int16 valid_max 7;
String contentType "referenceInformation";
String description "Composite POD/PPD flag that indicates the quality of input geolocation products for the specific height_segment. Value for height segment is sampled from geolocation parameter on ATL03. A non-zero value may indicate that geolocation solutions are degraded or that ATLAS is within a calibration scan period (CAL). Possible non-CAL values are: 0=Nominal; 1=POD_DEGRADE; 2=PPD_DEGRADE; 3=PODPPD_DEGRADE; possible CAL values are: 4=CAL_NOMINAL; 5=CAL_POD_DEGRADE; 6=CAL_PPD_DEGRADE; 7=CAL_PODPPD_DEGRADE. (ATL07 podppd_flag)";
String flag_meanings "nominal pod_degrade ppd_degrade podppd_degrade cal_nominal cal_pod_degrade cal_ppd_degrade new_meaning";
Int16 flag_values 0, 1, 2, 3, 4, 5, 6, 7;
String origname "podppd_flag";
String fullnamepath "/gt3l/freeboard_segment/heights/podppd_flag";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_backgr_r_200 {
Float32 _FillValue 3.402823466e+38;
String long_name "background rate 200 hz";
String units "hz";
String source "ATL09";
String contentType "modelResult";
String description "Background count rate, averaged over the segment based on ATLAS 50 pulse counts";
String origname "backgr_r_200";
String fullnamepath "/gt3l/freeboard_segment/heights/backgr_r_200";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_height_segment_height {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Mean height from along-track segment fit determined by the sea ice algorithm(ATL07 h_si). The sea ice height is relative to the tide-free MSS.";
String origname "height_segment_height";
String fullnamepath "/gt3l/freeboard_segment/heights/height_segment_height";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_height_segment_type {
String long_name "Segment surface type";
String units "1";
String source "ATBD section 4.3";
Int16 valid_min -1;
Int16 valid_max 9;
String contentType "referenceInformation";
String description "Value that indicates segment surface type as sea ice or different types of sea surface. (0=cloud covered)";
String flag_meanings "cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough new_meaning";
Int16 flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1;
String origname "height_segment_type";
String fullnamepath "/gt3l/freeboard_segment/heights/height_segment_type";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_height_segment_confidence {
Float32 _FillValue 3.402823466e+38;
String long_name "Surface height confidence";
String units "1";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis (ATL07 h_confidence)";
String origname "height_segment_confidence";
String fullnamepath "/gt3l/freeboard_segment/heights/height_segment_confidence";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_asr_25 {
Float32 _FillValue 3.402823466e+38;
String long_name "Apparent surface reflectance at 25 hz";
String units "1";
String source "ATL07";
String contentType "modelResult";
String description "Apparent surface reflectance at 25 hz, average to the sea ice segment";
String origname "asr_25";
String fullnamepath "/gt3l/freeboard_segment/heights/asr_25";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_height_segment_w_gaussian {
Float32 _FillValue 3.402823466e+38;
String long_name "width of best fit gaussian";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Width of best fit gaussian (ATL07 w_gaussian)";
String origname "height_segment_w_gaussian";
String fullnamepath "/gt3l/freeboard_segment/heights/height_segment_w_gaussian";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_photon_rate {
Float32 _FillValue 3.402823466e+38;
String long_name "photon rate";
String units "1";
String source "ATL07";
String contentType "modelResult";
String description "Photon count rate, averaged over sea ice segment.";
String origname "photon_rate";
String fullnamepath "/gt3l/freeboard_segment/heights/photon_rate";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_backgr_r_25 {
Float32 _FillValue 3.402823466e+38;
String long_name "background rate 25 hz";
String units "hz";
String source "ATL09";
String contentType "modelResult";
String description "Background count rate, averaged over the segment based on 25 hz atmosphere";
String origname "backgr_r_25";
String fullnamepath "/gt3l/freeboard_segment/heights/backgr_r_25";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_heights_height_segment_rms {
Float32 _FillValue 3.402823466e+38;
String long_name "height rms";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "RMS difference between sea ice modeled and observed photon height distribution (ATL07 h_rms)";
String origname "height_segment_rms";
String fullnamepath "/gt3l/freeboard_segment/heights/height_segment_rms";
String coordinates "gt3l_freeboard_segment_heights_delta_time gt3l_freeboard_segment_heights_latitude gt3l_freeboard_segment_heights_longitude";
}
gt3l_freeboard_segment_height_segment_id {
String units "1";
String long_name "Identifier of each height segment";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Identifier of each height segment";
String origname "height_segment_id";
String fullnamepath "/gt3l/freeboard_segment/height_segment_id";
String coordinates "gt3l_freeboard_segment_delta_time gt3l_freeboard_segment_latitude gt3l_freeboard_segment_longitude";
}
gt3l_freeboard_segment_beam_fb_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard height relative to beam_refsurf_height";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Freeboard height based on ATL07 ice surface height relative to beam_refsurf_height.";
String origname "beam_fb_height";
String fullnamepath "/gt3l/freeboard_segment/beam_fb_height";
String coordinates "gt3l_freeboard_segment_delta_time gt3l_freeboard_segment_latitude gt3l_freeboard_segment_longitude";
}
gt3l_freeboard_segment_beam_fb_unc {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard segment uncertainty";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Combined uncertainty from the height segment sigma and the reference surface sigma estimates";
String origname "beam_fb_unc";
String fullnamepath "/gt3l/freeboard_segment/beam_fb_unc";
String coordinates "gt3l_freeboard_segment_delta_time gt3l_freeboard_segment_latitude gt3l_freeboard_segment_longitude";
}
gt3l_freeboard_segment_seg_dist_x {
String long_name "Along track distance";
String units "meters";
String source "Sea Ice ATBD";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing to the segment center.";
String origname "seg_dist_x";
String fullnamepath "/gt3l/freeboard_segment/seg_dist_x";
String coordinates "gt3l_freeboard_segment_delta_time gt3l_freeboard_segment_latitude gt3l_freeboard_segment_longitude";
}
gt3l_freeboard_segment_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+, Lon of freeboard segment center";
String origname "longitude";
String fullnamepath "/gt3l/freeboard_segment/longitude";
String coordinates "gt3l_freeboard_segment_delta_time gt3l_freeboard_segment_latitude";
}
gt3l_freeboard_segment_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of freeboard segment center";
String origname "latitude";
String fullnamepath "/gt3l/freeboard_segment/latitude";
String coordinates "gt3l_freeboard_segment_delta_time gt3l_freeboard_segment_longitude";
}
gt3l_freeboard_segment_beam_refsurf_ndx {
String long_name "Index to beam refsur";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "1-based index to reference surface used for this freeboard height. Its value is identical to the fbswath_ndx. This index also identifies the beam section with which the beam freeboard associated.";
String origname "beam_refsurf_ndx";
String fullnamepath "/gt3l/freeboard_segment/beam_refsurf_ndx";
String coordinates "gt3l_freeboard_segment_delta_time gt3l_freeboard_segment_latitude gt3l_freeboard_segment_longitude";
}
gt3l_freeboard_segment_geophysical_height_segment_dac {
Float32 _FillValue 3.402823466e+38;
String long_name "Dynamic Atmosphere Correction";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect (From ATL07)";
String origname "height_segment_dac";
String fullnamepath "/gt3l/freeboard_segment/geophysical/height_segment_dac";
String coordinates "gt3l_freeboard_segment_geophysical_delta_time gt3l_freeboard_segment_geophysical_latitude gt3l_freeboard_segment_geophysical_longitude";
}
gt3l_freeboard_segment_geophysical_height_segment_tide_pole {
Float32 _FillValue 3.402823466e+38;
String long_name "Pole Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). (From ATL07)";
String origname "height_segment_tide_pole";
String fullnamepath "/gt3l/freeboard_segment/geophysical/height_segment_tide_pole";
String coordinates "gt3l_freeboard_segment_geophysical_delta_time gt3l_freeboard_segment_geophysical_latitude gt3l_freeboard_segment_geophysical_longitude";
}
gt3l_freeboard_segment_geophysical_height_segment_ib {
Float32 _FillValue 3.402823466e+38;
String long_name "inverted barometer effect";
String units "meters";
String source "ATBD section 4.2";
String contentType "referenceInformation";
String description "Inverted barometer effect calculated from surface pressure";
String origname "height_segment_ib";
String fullnamepath "/gt3l/freeboard_segment/geophysical/height_segment_ib";
String coordinates "gt3l_freeboard_segment_geophysical_delta_time gt3l_freeboard_segment_geophysical_latitude gt3l_freeboard_segment_geophysical_longitude";
}
gt3l_freeboard_segment_geophysical_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+,Lon of segment center";
String origname "longitude";
String fullnamepath "/gt3l/freeboard_segment/geophysical/longitude";
String coordinates "gt3l_freeboard_segment_geophysical_delta_time gt3l_freeboard_segment_geophysical_latitude";
}
gt3l_freeboard_segment_geophysical_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of segment center";
String origname "latitude";
String fullnamepath "/gt3l/freeboard_segment/geophysical/latitude";
String coordinates "gt3l_freeboard_segment_geophysical_delta_time gt3l_freeboard_segment_geophysical_longitude";
}
gt3l_freeboard_segment_geophysical_height_segment_load {
String units "meters";
Float32 _FillValue 3.402823466e+38;
String long_name "Load Tide";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). (From ATL07)";
String origname "height_segment_load";
String fullnamepath "/gt3l/freeboard_segment/geophysical/height_segment_load";
String coordinates "gt3l_freeboard_segment_geophysical_delta_time gt3l_freeboard_segment_geophysical_latitude gt3l_freeboard_segment_geophysical_longitude";
}
gt3l_freeboard_segment_geophysical_height_segment_geoid {
Float32 _FillValue 3.402823466e+38;
String long_name "EGM2008 Geoid";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model (From ATL07). The geoid height is in the tide-free system.";
String origname "height_segment_geoid";
String fullnamepath "/gt3l/freeboard_segment/geophysical/height_segment_geoid";
String coordinates "gt3l_freeboard_segment_geophysical_delta_time gt3l_freeboard_segment_geophysical_latitude gt3l_freeboard_segment_geophysical_longitude";
}
gt3l_freeboard_segment_geophysical_height_segment_ocean {
Float32 _FillValue 3.402823466e+38;
String long_name "Ocean Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium).";
String origname "height_segment_ocean";
String fullnamepath "/gt3l/freeboard_segment/geophysical/height_segment_ocean";
String coordinates "gt3l_freeboard_segment_geophysical_delta_time gt3l_freeboard_segment_geophysical_latitude gt3l_freeboard_segment_geophysical_longitude";
}
gt3l_freeboard_segment_geophysical_height_segment_dynib {
Float32 _FillValue 3.402823466e+38;
String long_name "Dynamic inverted barometer effect";
String standard_name "dynamic inverted barometer";
String units "meters";
String source "ATBD section 4.2";
String contentType "referenceInformation";
String description "Inverted barometer effect calculated from dynamic mean ocean sea level pressure (computed using ANC10 and ANC48, /ancillary_data/freeboard_estimation/mean_ocean_slp)";
String origname "height_segment_dynib";
String fullnamepath "/gt3l/freeboard_segment/geophysical/height_segment_dynib";
String coordinates "gt3l_freeboard_segment_geophysical_delta_time gt3l_freeboard_segment_geophysical_latitude gt3l_freeboard_segment_geophysical_longitude";
}
gt3l_freeboard_segment_geophysical_height_segment_earth_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Earth Tide Free-to-Mean conversion";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Additive value to convert solid earth tide from the tide-free system to the mean-tide system. (Add to height_segment_earth to get the solid earth tides in the mean-tide system.)";
String origname "height_segment_earth_free2mean";
String fullnamepath "/gt3l/freeboard_segment/geophysical/height_segment_earth_free2mean";
String coordinates "gt3l_freeboard_segment_geophysical_delta_time gt3l_freeboard_segment_geophysical_latitude gt3l_freeboard_segment_geophysical_longitude";
}
gt3l_freeboard_segment_geophysical_height_segment_geoid_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "EGM2008 Geoid Free-to-Mean conversion";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system. (Add to height_segment_geoid to get the geoid heights in the mean-tide system.)";
String origname "height_segment_geoid_free2mean";
String fullnamepath "/gt3l/freeboard_segment/geophysical/height_segment_geoid_free2mean";
String coordinates "gt3l_freeboard_segment_geophysical_delta_time gt3l_freeboard_segment_geophysical_latitude gt3l_freeboard_segment_geophysical_longitude";
}
gt3l_freeboard_segment_geophysical_height_segment_mss {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean Sea Surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Mean sea surface height above WGS-84 reference ellipsoid (range: -68 to 65m), based on a CryoSat-2/DTU14 merged product (https://doi.org/10.5281/zenodo.4294047). The MSS height (from ANC15 used in atlas_l3a_si processing) is adjusted to be in a tide free reference system (subtracting the geoid_free2mean correction) to be consistent with the tide free ATL03 heights.";
String origname "height_segment_mss";
String fullnamepath "/gt3l/freeboard_segment/geophysical/height_segment_mss";
String coordinates "gt3l_freeboard_segment_geophysical_delta_time gt3l_freeboard_segment_geophysical_latitude gt3l_freeboard_segment_geophysical_longitude";
}
gt3l_freeboard_segment_geophysical_height_segment_lpe {
Float32 _FillValue 3.402823466e+38;
String long_name "Equilibrium Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Long period equilibrium tide self-consistent with ocean tide model (+-0.04m).";
String origname "height_segment_lpe";
String fullnamepath "/gt3l/freeboard_segment/geophysical/height_segment_lpe";
String coordinates "gt3l_freeboard_segment_geophysical_delta_time gt3l_freeboard_segment_geophysical_latitude gt3l_freeboard_segment_geophysical_longitude";
}
gt3l_freeboard_segment_geophysical_height_segment_earth {
String units "meters";
Float32 _FillValue 3.402823466e+38;
String long_name "Earth Tide";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Solid Earth Tide (From ATL07). The solid earth tide height is in the tide-free system.";
String origname "height_segment_earth";
String fullnamepath "/gt3l/freeboard_segment/geophysical/height_segment_earth";
String coordinates "gt3l_freeboard_segment_geophysical_delta_time gt3l_freeboard_segment_geophysical_latitude gt3l_freeboard_segment_geophysical_longitude";
}
gt3l_freeboard_segment_geoseg_beg {
String long_name "Beginning GEOSEG";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment";
String origname "geoseg_beg";
String fullnamepath "/gt3l/freeboard_segment/geoseg_beg";
String coordinates "gt3l_freeboard_segment_delta_time gt3l_freeboard_segment_latitude gt3l_freeboard_segment_longitude";
}
gt3l_freeboard_segment_beam_fb_confidence {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard confidence";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Confidence level in the freeboard estimate";
String origname "beam_fb_confidence";
String fullnamepath "/gt3l/freeboard_segment/beam_fb_confidence";
String coordinates "gt3l_freeboard_segment_delta_time gt3l_freeboard_segment_latitude gt3l_freeboard_segment_longitude";
}
gt3l_freeboard_segment_geoseg_end {
String long_name "Ending GEOSEG";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment";
String origname "geoseg_end";
String fullnamepath "/gt3l/freeboard_segment/geoseg_end";
String coordinates "gt3l_freeboard_segment_delta_time gt3l_freeboard_segment_latitude gt3l_freeboard_segment_longitude";
}
gt3l_freeboard_segment_beam_fb_quality_flag {
String units "1";
String long_name "Flag describing the quality of the freeboard estimate";
String source "ATBD section 5";
Int16 valid_min -1;
Int16 valid_max 5;
String contentType "referenceInformation";
String description "Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor).";
String flag_meanings "invalid best high med low poor";
Int16 flag_values -1, 1, 2, 3, 4, 5;
String origname "beam_fb_quality_flag";
String fullnamepath "/gt3l/freeboard_segment/beam_fb_quality_flag";
String coordinates "gt3l_freeboard_segment_delta_time gt3l_freeboard_segment_latitude gt3l_freeboard_segment_longitude";
}
gt3l_reference_surface_section_beam_refsurf_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface height sigma";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface height sigma (standard deviation) - weighted combination of lead sigmas in this beam for this swath segment";
String origname "beam_refsurf_sigma";
String fullnamepath "/gt3l/reference_surface_section/beam_refsurf_sigma";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_beam_refsurf_alongtrack_slope {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface along track slope";
String units "degrees";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface height along track slope";
String origname "beam_refsurf_alongtrack_slope";
String fullnamepath "/gt3l/reference_surface_section/beam_refsurf_alongtrack_slope";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_beam_lead_ndx {
String long_name "index first lead";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "1-based index to the first /GTx/leads lead used for this beam's reference surface.";
String origname "beam_lead_ndx";
String fullnamepath "/gt3l/reference_surface_section/beam_lead_ndx";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_beam_refsurf_mss {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section Mean Sea Surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Mean sea surface height above WGS-84 reference ellipsoid at reference surface length scale, sampled from height_segment_mss (tide free).";
String origname "beam_refsurf_mss";
String fullnamepath "/gt3l/reference_surface_section/beam_refsurf_mss";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_beam_fb_hist_refsurf {
String long_name "Reference surface section freeboard histogram";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Reference surface freeboard histogram (distribution) for this reference surface section";
String origname "beam_fb_hist_refsurf";
String fullnamepath "/gt3l/reference_surface_section/beam_fb_hist_refsurf";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_beam_refsurf_geoid {
Float32 _FillValue 3.402823466e+38;
String long_name "reference surface section mean EGM2008 Geoid";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geoid height above WGS-84 reference ellipsoid at the reference surface length scale (range -107 to 86m), based on the EGM2008 model. The geoid height is in the tide-free system.";
String origname "beam_refsurf_geoid";
String fullnamepath "/gt3l/reference_surface_section/beam_refsurf_geoid";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_beam_refsurf_interp_flag {
String long_name "Reference surface section interpolation flag";
String units "1";
String source "ATBD section 5";
Int16 valid_min -1;
Int16 valid_max 3;
String contentType "referenceInformation";
String description "Identifies reference surface sections with reference surface height filled through interpolation. -1 = no valid reference surface determined; 0= reference surface computed from leads in this swath; 1 = reference surface computed by interpolation using two valid reference surface (constrained by thresholds maxgaptime and maxgapht); 2 = reference surface computed using one-point fill (linear interpolation between two adjacent valid reference surfaces, constrained by threshold maxpadtime); 3 = reference surface computed using end-point fill (missing reference surface is set to the previous or next adjacent valid reference surface, constrained by threshold maxpadtime)";
String flag_meanings "no_surf leads_in_swath inferred one-point_fill end-point_fill";
Int16 flag_values -1, 0, 1, 2, 3;
String origname "beam_refsurf_interp_flag";
String fullnamepath "/gt3l/reference_surface_section/beam_refsurf_interp_flag";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_beam_refsurf_geoid_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface geoid free-to-mean conversion";
String standard_name "geoid free2mean";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system at reference surface length scale.";
String origname "beam_refsurf_geoid_free2mean";
String fullnamepath "/gt3l/reference_surface_section/beam_refsurf_geoid_free2mean";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_longitude {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Center longitude of reference surface section";
String standard_name "longitude";
String units "degrees_east";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center longitude of reference surface section (mean of all freeboard longitudes)";
String origname "longitude";
String fullnamepath "/gt3l/reference_surface_section/longitude";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude";
}
gt3l_reference_surface_section_beam_refsurf_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section height mean";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface section mean height - weighted combination of leads in this beam for this reference surface section. The reference surface height is relative to the tide-free MSS.";
String origname "beam_refsurf_height";
String fullnamepath "/gt3l/reference_surface_section/beam_refsurf_height";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_latitude {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Center latitude of reference surface section";
String standard_name "latitude";
String units "degrees_north";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center latitude of reference surface section (mean of all freeboard latitudes)";
String origname "latitude";
String fullnamepath "/gt3l/reference_surface_section/latitude";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_beam_refsurf_earth_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section solid earth tide free-to-mean conversion";
String standard_name "solid earth tide free2mean";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Additive value to convert solid earth tide from the tide-free system to the mean-tide system at reference surface length scale.";
String origname "beam_refsurf_earth_free2mean";
String fullnamepath "/gt3l/reference_surface_section/beam_refsurf_earth_free2mean";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_beam_fb_unc_refsurf {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean freeboard uncertainty";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Freeboard uncertainty estimate from the reference surface section mean freeboard, sampled from beam_freeboard/beam_fb_unc";
String origname "beam_fb_unc_refsurf";
String fullnamepath "/gt3l/reference_surface_section/beam_fb_unc_refsurf";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_beam_fb_length_refsurf_sum {
Float32 _FillValue 3.402823466e+38;
String long_name "Total length of freeboard segments";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Length of freeboard beam-segments within this reference surface section";
String origname "beam_fb_length_refsurf_sum";
String fullnamepath "/gt3l/reference_surface_section/beam_fb_length_refsurf_sum";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_fbswath_ndx {
String long_name "Index to freeboard swath segment";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "The 1-based fbswath_nx identifies the swath associated with each element. There are the same number of elements in the group /freeboard_swath_segment and in each of the /GTx/freeboard_beam_segment groups. The fbswath_nx identifies the fbswath_refsurf_height used to compute the fbswath_fb_height. It is the same index number that idenitifies the beam_refsurf_height to its swath and the beam_refsurf_height used to computed the beam_fb_height.";
String origname "fbswath_ndx";
String fullnamepath "/gt3l/reference_surface_section/fbswath_ndx";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_beam_refsurf_dist_x {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Along track distance";
String standard_name "distance";
String units "m";
String source "atl07";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing. Distance is calculated by averaging distance of all leads contained in reference surface.";
String origname "beam_refsurf_dist_x";
String fullnamepath "/gt3l/reference_surface_section/beam_refsurf_dist_x";
String coordinates "gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_beam_fb_refsurf {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean reference surface section freeboard";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Mean segment length weighted reference surface freeboard.";
String origname "beam_fb_refsurf";
String fullnamepath "/gt3l/reference_surface_section/beam_fb_refsurf";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_reference_surface_section_beam_lead_n {
String long_name "Number of leads";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Number of leads used for this beam reference surface section";
String origname "beam_lead_n";
String fullnamepath "/gt3l/reference_surface_section/beam_lead_n";
String coordinates "gt3l_reference_surface_section_delta_time gt3l_reference_surface_section_latitude gt3l_reference_surface_section_longitude";
}
gt3l_leads_lead_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead sigma estimate";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Lead height sigma (standard deviation) estimate - weighted combination of sea surface height sigmas used as leads in this beam for this swath segment";
String origname "lead_sigma";
String fullnamepath "/gt3l/leads/lead_sigma";
String coordinates "gt3l_leads_delta_time gt3l_leads_latitude gt3l_leads_longitude";
}
gt3l_leads_lead_dist_x {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Along Track Distance";
String standard_name "distance";
String units "m";
String source "atl07";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing. Distance is calculated by averaging distance of all ssh segments contained in lead.";
String origname "lead_dist_x";
String fullnamepath "/gt3l/leads/lead_dist_x";
String coordinates "gt3l_leads_latitude gt3l_leads_longitude";
}
gt3l_leads_longitude {
String long_name "Center longitude of lead";
String standard_name "longitude";
String units "degrees_east";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center longitude of lead (mean of all freeboard longitudes)";
String origname "longitude";
String fullnamepath "/gt3l/leads/longitude";
String coordinates "gt3l_leads_delta_time gt3l_leads_latitude";
}
gt3l_leads_latitude {
String long_name "Center latitude of lead";
String standard_name "latitude";
String units "degrees_north";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center latitude of lead (mean of all sea surface height latitudes)";
String origname "latitude";
String fullnamepath "/gt3l/leads/latitude";
String coordinates "gt3l_leads_delta_time gt3l_leads_longitude";
}
gt3l_leads_lead_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead height";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Lead height - weighted mean of consective sea surface heights used for this lead. The lead height is relative to the tide-free MSS.";
String origname "lead_height";
String fullnamepath "/gt3l/leads/lead_height";
String coordinates "gt3l_leads_delta_time gt3l_leads_latitude gt3l_leads_longitude";
}
gt3l_leads_ssh_ndx {
String long_name "index first sea surface";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "1-based index to the first freeboard element (i.e.first sea surface height segment) used for this lead";
String origname "ssh_ndx";
String fullnamepath "/gt3l/leads/ssh_ndx";
String coordinates "gt3l_leads_delta_time gt3l_leads_latitude gt3l_leads_longitude";
}
gt3l_leads_ssh_n {
String long_name "number of sea surface references";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Number of sea surface height segments used for this lead";
String origname "ssh_n";
String fullnamepath "/gt3l/leads/ssh_n";
String coordinates "gt3l_leads_delta_time gt3l_leads_latitude gt3l_leads_longitude";
}
gt3l_leads_lead_length {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead size";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Along-track length of this lead";
String origname "lead_length";
String fullnamepath "/gt3l/leads/lead_length";
String coordinates "gt3l_leads_delta_time gt3l_leads_latitude gt3l_leads_longitude";
}
gt2l_freeboard_segment_heights_msw_flag {
String long_name "multiple scattering warning flag";
String units "1";
String source "ATL09";
Int16 valid_min -1;
Int16 valid_max 5;
String contentType "modelResult";
String description "Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight.";
String flag_meanings "cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5";
Int16 flag_values -1, 0, 1, 2, 3, 4, 5;
String origname "msw_flag";
String fullnamepath "/gt2l/freeboard_segment/heights/msw_flag";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_cloud_flag_atm {
String long_name "cloud flag atm";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 10;
String contentType "modelResult";
String description "Number of layers found from the backscatter profile using the DDA layer finder";
String origname "cloud_flag_atm";
String fullnamepath "/gt2l/freeboard_segment/heights/cloud_flag_atm";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_height_segment_length_seg {
Float32 _FillValue 3.402823466e+38;
String long_name "length of segment";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Along-track length of segment containing n_photons_actual (ATL07 length_seg)";
String origname "height_segment_length_seg";
String fullnamepath "/gt2l/freeboard_segment/heights/height_segment_length_seg";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_bsnow_con {
Float32 _FillValue 3.402823466e+38;
String long_name "Blowing snow confidence";
String units "1";
String source "ATL09";
String contentType "modelResult";
String description "Blowing snow confidence";
String origname "bsnow_con";
String fullnamepath "/gt2l/freeboard_segment/heights/bsnow_con";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_layer_flag {
String long_name "consolidated cloud flag";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 1;
String contentType "modelResult";
String description "This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow.";
String flag_meanings "likely_clear likely_cloudy";
Int16 flag_values 0, 1;
String origname "layer_flag";
String fullnamepath "/gt2l/freeboard_segment/heights/layer_flag";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_backgr_calc {
Float32 _FillValue 3.402823466e+38;
String long_name "background count rate calculated";
String units "hz";
String source "ATL07";
String contentType "modelResult";
String description "Calculated background count rate based on sun angle, surface slope, unit reflectance";
String origname "backgr_calc";
String fullnamepath "/gt2l/freeboard_segment/heights/backgr_calc";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_ice_conc_amsr2 {
Float32 _FillValue 3.402823466e+38;
String long_name "sea ice concentration from AMSR2 file";
String units "1";
String source "ATL07/ANC31";
String contentType "modelResult";
String description "Sea ice concentration from daily AMSR2 sea ice concentration file (ANC49)";
String origname "ice_conc_amsr2";
String fullnamepath "/gt2l/freeboard_segment/heights/ice_conc_amsr2";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_bsnow_h {
Float32 _FillValue 3.402823466e+38;
String long_name "Blowing snow top height";
String units "meters";
String source "ATL09";
String contentType "modelResult";
String description "Blowing snow layer top height";
String origname "bsnow_h";
String fullnamepath "/gt2l/freeboard_segment/heights/bsnow_h";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+, Lon of segment center";
String origname "longitude";
String fullnamepath "/gt2l/freeboard_segment/heights/longitude";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude";
}
gt2l_freeboard_segment_heights_height_segment_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "h surface sigma";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Sigma height surface error estimate - width of the trimmed histogram divided by the number of photons.";
String origname "height_segment_sigma";
String fullnamepath "/gt2l/freeboard_segment/heights/height_segment_sigma";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_background_r_norm {
Float32 _FillValue 3.402823466e+38;
String long_name "normalized background (50 shot)";
String units "hz";
String source "ATL07";
String contentType "modelResult";
String description "Background rate normalized to a fixed solar elevation angle";
String origname "background_r_norm";
String fullnamepath "/gt2l/freeboard_segment/heights/background_r_norm";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of segment center";
String origname "latitude";
String fullnamepath "/gt2l/freeboard_segment/heights/latitude";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_height_segment_ocdepth {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment ocean depth";
String standard_name "ocdepth";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Height segment ocean depth";
String origname "height_segment_ocdepth";
String fullnamepath "/gt2l/freeboard_segment/heights/height_segment_ocdepth";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_height_segment_dist2land {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment distance to land";
String standard_name "dist2land";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Height segment distance to land";
String origname "height_segment_dist2land";
String fullnamepath "/gt2l/freeboard_segment/heights/height_segment_dist2land";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_cloud_flag_asr {
String long_name "cloud flag asr";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 5;
String contentType "modelResult";
String description "Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence";
String flag_meanings "clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence";
Int16 flag_values 0, 1, 2, 3, 4, 5;
String origname "cloud_flag_asr";
String fullnamepath "/gt2l/freeboard_segment/heights/cloud_flag_asr";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_ice_conc_ssmi {
Float32 _FillValue 3.402823466e+38;
String long_name "sea ice concentration";
String units "1";
String source "ATL07/ANC31";
String contentType "modelResult";
String description "Sea ice concentration from daily SSMI sea ice concentration file (ANC31)";
String origname "ice_conc_ssmi";
String fullnamepath "/gt2l/freeboard_segment/heights/ice_conc_ssmi";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_height_segment_ssh_flag {
String long_name "Sea Surface Height Flag";
String units "1";
String source "Sea Ice ATBD";
Int16 valid_min 0;
Int16 valid_max 2;
String contentType "referenceInformation";
String description "Identifiesthe height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. The flags are set as follows: 0 = sea ice; 1 = potential reference sea surface height; 2 = used in calculating reference sea surface height";
String flag_meanings "sea_ice potential_sea_ice_surface new_meaning";
Int16 flag_values 0, 1, 2;
String origname "height_segment_ssh_flag";
String fullnamepath "/gt2l/freeboard_segment/heights/height_segment_ssh_flag";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_podppd_flag {
String long_name "POD_PPD Flag";
String units "1";
String source "ATL07, ATL03, ATL02, ANC04, ANC05";
Int16 valid_min 0;
Int16 valid_max 7;
String contentType "referenceInformation";
String description "Composite POD/PPD flag that indicates the quality of input geolocation products for the specific height_segment. Value for height segment is sampled from geolocation parameter on ATL03. A non-zero value may indicate that geolocation solutions are degraded or that ATLAS is within a calibration scan period (CAL). Possible non-CAL values are: 0=Nominal; 1=POD_DEGRADE; 2=PPD_DEGRADE; 3=PODPPD_DEGRADE; possible CAL values are: 4=CAL_NOMINAL; 5=CAL_POD_DEGRADE; 6=CAL_PPD_DEGRADE; 7=CAL_PODPPD_DEGRADE. (ATL07 podppd_flag)";
String flag_meanings "nominal pod_degrade ppd_degrade podppd_degrade cal_nominal cal_pod_degrade cal_ppd_degrade new_meaning";
Int16 flag_values 0, 1, 2, 3, 4, 5, 6, 7;
String origname "podppd_flag";
String fullnamepath "/gt2l/freeboard_segment/heights/podppd_flag";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_backgr_r_200 {
Float32 _FillValue 3.402823466e+38;
String long_name "background rate 200 hz";
String units "hz";
String source "ATL09";
String contentType "modelResult";
String description "Background count rate, averaged over the segment based on ATLAS 50 pulse counts";
String origname "backgr_r_200";
String fullnamepath "/gt2l/freeboard_segment/heights/backgr_r_200";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_height_segment_height {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Mean height from along-track segment fit determined by the sea ice algorithm(ATL07 h_si). The sea ice height is relative to the tide-free MSS.";
String origname "height_segment_height";
String fullnamepath "/gt2l/freeboard_segment/heights/height_segment_height";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_height_segment_type {
String long_name "Segment surface type";
String units "1";
String source "ATBD section 4.3";
Int16 valid_min -1;
Int16 valid_max 9;
String contentType "referenceInformation";
String description "Value that indicates segment surface type as sea ice or different types of sea surface. (0=cloud covered)";
String flag_meanings "cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough new_meaning";
Int16 flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1;
String origname "height_segment_type";
String fullnamepath "/gt2l/freeboard_segment/heights/height_segment_type";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_height_segment_confidence {
Float32 _FillValue 3.402823466e+38;
String long_name "Surface height confidence";
String units "1";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis (ATL07 h_confidence)";
String origname "height_segment_confidence";
String fullnamepath "/gt2l/freeboard_segment/heights/height_segment_confidence";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_asr_25 {
Float32 _FillValue 3.402823466e+38;
String long_name "Apparent surface reflectance at 25 hz";
String units "1";
String source "ATL07";
String contentType "modelResult";
String description "Apparent surface reflectance at 25 hz, average to the sea ice segment";
String origname "asr_25";
String fullnamepath "/gt2l/freeboard_segment/heights/asr_25";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_height_segment_w_gaussian {
Float32 _FillValue 3.402823466e+38;
String long_name "width of best fit gaussian";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Width of best fit gaussian (ATL07 w_gaussian)";
String origname "height_segment_w_gaussian";
String fullnamepath "/gt2l/freeboard_segment/heights/height_segment_w_gaussian";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_photon_rate {
Float32 _FillValue 3.402823466e+38;
String long_name "photon rate";
String units "1";
String source "ATL07";
String contentType "modelResult";
String description "Photon count rate, averaged over sea ice segment.";
String origname "photon_rate";
String fullnamepath "/gt2l/freeboard_segment/heights/photon_rate";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_backgr_r_25 {
Float32 _FillValue 3.402823466e+38;
String long_name "background rate 25 hz";
String units "hz";
String source "ATL09";
String contentType "modelResult";
String description "Background count rate, averaged over the segment based on 25 hz atmosphere";
String origname "backgr_r_25";
String fullnamepath "/gt2l/freeboard_segment/heights/backgr_r_25";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_heights_height_segment_rms {
Float32 _FillValue 3.402823466e+38;
String long_name "height rms";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "RMS difference between sea ice modeled and observed photon height distribution (ATL07 h_rms)";
String origname "height_segment_rms";
String fullnamepath "/gt2l/freeboard_segment/heights/height_segment_rms";
String coordinates "gt2l_freeboard_segment_heights_delta_time gt2l_freeboard_segment_heights_latitude gt2l_freeboard_segment_heights_longitude";
}
gt2l_freeboard_segment_height_segment_id {
String units "1";
String long_name "Identifier of each height segment";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Identifier of each height segment";
String origname "height_segment_id";
String fullnamepath "/gt2l/freeboard_segment/height_segment_id";
String coordinates "gt2l_freeboard_segment_delta_time gt2l_freeboard_segment_latitude gt2l_freeboard_segment_longitude";
}
gt2l_freeboard_segment_beam_fb_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard height relative to beam_refsurf_height";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Freeboard height based on ATL07 ice surface height relative to beam_refsurf_height.";
String origname "beam_fb_height";
String fullnamepath "/gt2l/freeboard_segment/beam_fb_height";
String coordinates "gt2l_freeboard_segment_delta_time gt2l_freeboard_segment_latitude gt2l_freeboard_segment_longitude";
}
gt2l_freeboard_segment_beam_fb_unc {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard segment uncertainty";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Combined uncertainty from the height segment sigma and the reference surface sigma estimates";
String origname "beam_fb_unc";
String fullnamepath "/gt2l/freeboard_segment/beam_fb_unc";
String coordinates "gt2l_freeboard_segment_delta_time gt2l_freeboard_segment_latitude gt2l_freeboard_segment_longitude";
}
gt2l_freeboard_segment_seg_dist_x {
String long_name "Along track distance";
String units "meters";
String source "Sea Ice ATBD";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing to the segment center.";
String origname "seg_dist_x";
String fullnamepath "/gt2l/freeboard_segment/seg_dist_x";
String coordinates "gt2l_freeboard_segment_delta_time gt2l_freeboard_segment_latitude gt2l_freeboard_segment_longitude";
}
gt2l_freeboard_segment_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+, Lon of freeboard segment center";
String origname "longitude";
String fullnamepath "/gt2l/freeboard_segment/longitude";
String coordinates "gt2l_freeboard_segment_delta_time gt2l_freeboard_segment_latitude";
}
gt2l_freeboard_segment_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of freeboard segment center";
String origname "latitude";
String fullnamepath "/gt2l/freeboard_segment/latitude";
String coordinates "gt2l_freeboard_segment_delta_time gt2l_freeboard_segment_longitude";
}
gt2l_freeboard_segment_beam_refsurf_ndx {
String long_name "Index to beam refsur";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "1-based index to reference surface used for this freeboard height. Its value is identical to the fbswath_ndx. This index also identifies the beam section with which the beam freeboard associated.";
String origname "beam_refsurf_ndx";
String fullnamepath "/gt2l/freeboard_segment/beam_refsurf_ndx";
String coordinates "gt2l_freeboard_segment_delta_time gt2l_freeboard_segment_latitude gt2l_freeboard_segment_longitude";
}
gt2l_freeboard_segment_geophysical_height_segment_dac {
Float32 _FillValue 3.402823466e+38;
String long_name "Dynamic Atmosphere Correction";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect (From ATL07)";
String origname "height_segment_dac";
String fullnamepath "/gt2l/freeboard_segment/geophysical/height_segment_dac";
String coordinates "gt2l_freeboard_segment_geophysical_delta_time gt2l_freeboard_segment_geophysical_latitude gt2l_freeboard_segment_geophysical_longitude";
}
gt2l_freeboard_segment_geophysical_height_segment_tide_pole {
Float32 _FillValue 3.402823466e+38;
String long_name "Pole Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). (From ATL07)";
String origname "height_segment_tide_pole";
String fullnamepath "/gt2l/freeboard_segment/geophysical/height_segment_tide_pole";
String coordinates "gt2l_freeboard_segment_geophysical_delta_time gt2l_freeboard_segment_geophysical_latitude gt2l_freeboard_segment_geophysical_longitude";
}
gt2l_freeboard_segment_geophysical_height_segment_ib {
Float32 _FillValue 3.402823466e+38;
String long_name "inverted barometer effect";
String units "meters";
String source "ATBD section 4.2";
String contentType "referenceInformation";
String description "Inverted barometer effect calculated from surface pressure";
String origname "height_segment_ib";
String fullnamepath "/gt2l/freeboard_segment/geophysical/height_segment_ib";
String coordinates "gt2l_freeboard_segment_geophysical_delta_time gt2l_freeboard_segment_geophysical_latitude gt2l_freeboard_segment_geophysical_longitude";
}
gt2l_freeboard_segment_geophysical_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+,Lon of segment center";
String origname "longitude";
String fullnamepath "/gt2l/freeboard_segment/geophysical/longitude";
String coordinates "gt2l_freeboard_segment_geophysical_delta_time gt2l_freeboard_segment_geophysical_latitude";
}
gt2l_freeboard_segment_geophysical_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of segment center";
String origname "latitude";
String fullnamepath "/gt2l/freeboard_segment/geophysical/latitude";
String coordinates "gt2l_freeboard_segment_geophysical_delta_time gt2l_freeboard_segment_geophysical_longitude";
}
gt2l_freeboard_segment_geophysical_height_segment_load {
String units "meters";
Float32 _FillValue 3.402823466e+38;
String long_name "Load Tide";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). (From ATL07)";
String origname "height_segment_load";
String fullnamepath "/gt2l/freeboard_segment/geophysical/height_segment_load";
String coordinates "gt2l_freeboard_segment_geophysical_delta_time gt2l_freeboard_segment_geophysical_latitude gt2l_freeboard_segment_geophysical_longitude";
}
gt2l_freeboard_segment_geophysical_height_segment_geoid {
Float32 _FillValue 3.402823466e+38;
String long_name "EGM2008 Geoid";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model (From ATL07). The geoid height is in the tide-free system.";
String origname "height_segment_geoid";
String fullnamepath "/gt2l/freeboard_segment/geophysical/height_segment_geoid";
String coordinates "gt2l_freeboard_segment_geophysical_delta_time gt2l_freeboard_segment_geophysical_latitude gt2l_freeboard_segment_geophysical_longitude";
}
gt2l_freeboard_segment_geophysical_height_segment_ocean {
Float32 _FillValue 3.402823466e+38;
String long_name "Ocean Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium).";
String origname "height_segment_ocean";
String fullnamepath "/gt2l/freeboard_segment/geophysical/height_segment_ocean";
String coordinates "gt2l_freeboard_segment_geophysical_delta_time gt2l_freeboard_segment_geophysical_latitude gt2l_freeboard_segment_geophysical_longitude";
}
gt2l_freeboard_segment_geophysical_height_segment_dynib {
Float32 _FillValue 3.402823466e+38;
String long_name "Dynamic inverted barometer effect";
String standard_name "dynamic inverted barometer";
String units "meters";
String source "ATBD section 4.2";
String contentType "referenceInformation";
String description "Inverted barometer effect calculated from dynamic mean ocean sea level pressure (computed using ANC10 and ANC48, /ancillary_data/freeboard_estimation/mean_ocean_slp)";
String origname "height_segment_dynib";
String fullnamepath "/gt2l/freeboard_segment/geophysical/height_segment_dynib";
String coordinates "gt2l_freeboard_segment_geophysical_delta_time gt2l_freeboard_segment_geophysical_latitude gt2l_freeboard_segment_geophysical_longitude";
}
gt2l_freeboard_segment_geophysical_height_segment_earth_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Earth Tide Free-to-Mean conversion";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Additive value to convert solid earth tide from the tide-free system to the mean-tide system. (Add to height_segment_earth to get the solid earth tides in the mean-tide system.)";
String origname "height_segment_earth_free2mean";
String fullnamepath "/gt2l/freeboard_segment/geophysical/height_segment_earth_free2mean";
String coordinates "gt2l_freeboard_segment_geophysical_delta_time gt2l_freeboard_segment_geophysical_latitude gt2l_freeboard_segment_geophysical_longitude";
}
gt2l_freeboard_segment_geophysical_height_segment_geoid_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "EGM2008 Geoid Free-to-Mean conversion";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system. (Add to height_segment_geoid to get the geoid heights in the mean-tide system.)";
String origname "height_segment_geoid_free2mean";
String fullnamepath "/gt2l/freeboard_segment/geophysical/height_segment_geoid_free2mean";
String coordinates "gt2l_freeboard_segment_geophysical_delta_time gt2l_freeboard_segment_geophysical_latitude gt2l_freeboard_segment_geophysical_longitude";
}
gt2l_freeboard_segment_geophysical_height_segment_mss {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean Sea Surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Mean sea surface height above WGS-84 reference ellipsoid (range: -68 to 65m), based on a CryoSat-2/DTU14 merged product (https://doi.org/10.5281/zenodo.4294047). The MSS height (from ANC15 used in atlas_l3a_si processing) is adjusted to be in a tide free reference system (subtracting the geoid_free2mean correction) to be consistent with the tide free ATL03 heights.";
String origname "height_segment_mss";
String fullnamepath "/gt2l/freeboard_segment/geophysical/height_segment_mss";
String coordinates "gt2l_freeboard_segment_geophysical_delta_time gt2l_freeboard_segment_geophysical_latitude gt2l_freeboard_segment_geophysical_longitude";
}
gt2l_freeboard_segment_geophysical_height_segment_lpe {
Float32 _FillValue 3.402823466e+38;
String long_name "Equilibrium Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Long period equilibrium tide self-consistent with ocean tide model (+-0.04m).";
String origname "height_segment_lpe";
String fullnamepath "/gt2l/freeboard_segment/geophysical/height_segment_lpe";
String coordinates "gt2l_freeboard_segment_geophysical_delta_time gt2l_freeboard_segment_geophysical_latitude gt2l_freeboard_segment_geophysical_longitude";
}
gt2l_freeboard_segment_geophysical_height_segment_earth {
String units "meters";
Float32 _FillValue 3.402823466e+38;
String long_name "Earth Tide";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Solid Earth Tide (From ATL07). The solid earth tide height is in the tide-free system.";
String origname "height_segment_earth";
String fullnamepath "/gt2l/freeboard_segment/geophysical/height_segment_earth";
String coordinates "gt2l_freeboard_segment_geophysical_delta_time gt2l_freeboard_segment_geophysical_latitude gt2l_freeboard_segment_geophysical_longitude";
}
gt2l_freeboard_segment_geoseg_beg {
String long_name "Beginning GEOSEG";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment";
String origname "geoseg_beg";
String fullnamepath "/gt2l/freeboard_segment/geoseg_beg";
String coordinates "gt2l_freeboard_segment_delta_time gt2l_freeboard_segment_latitude gt2l_freeboard_segment_longitude";
}
gt2l_freeboard_segment_beam_fb_confidence {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard confidence";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Confidence level in the freeboard estimate";
String origname "beam_fb_confidence";
String fullnamepath "/gt2l/freeboard_segment/beam_fb_confidence";
String coordinates "gt2l_freeboard_segment_delta_time gt2l_freeboard_segment_latitude gt2l_freeboard_segment_longitude";
}
gt2l_freeboard_segment_geoseg_end {
String long_name "Ending GEOSEG";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment";
String origname "geoseg_end";
String fullnamepath "/gt2l/freeboard_segment/geoseg_end";
String coordinates "gt2l_freeboard_segment_delta_time gt2l_freeboard_segment_latitude gt2l_freeboard_segment_longitude";
}
gt2l_freeboard_segment_beam_fb_quality_flag {
String units "1";
String long_name "Flag describing the quality of the freeboard estimate";
String source "ATBD section 5";
Int16 valid_min -1;
Int16 valid_max 5;
String contentType "referenceInformation";
String description "Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor).";
String flag_meanings "invalid best high med low poor";
Int16 flag_values -1, 1, 2, 3, 4, 5;
String origname "beam_fb_quality_flag";
String fullnamepath "/gt2l/freeboard_segment/beam_fb_quality_flag";
String coordinates "gt2l_freeboard_segment_delta_time gt2l_freeboard_segment_latitude gt2l_freeboard_segment_longitude";
}
gt2l_reference_surface_section_beam_refsurf_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface height sigma";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface height sigma (standard deviation) - weighted combination of lead sigmas in this beam for this swath segment";
String origname "beam_refsurf_sigma";
String fullnamepath "/gt2l/reference_surface_section/beam_refsurf_sigma";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_beam_refsurf_alongtrack_slope {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface along track slope";
String units "degrees";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface height along track slope";
String origname "beam_refsurf_alongtrack_slope";
String fullnamepath "/gt2l/reference_surface_section/beam_refsurf_alongtrack_slope";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_beam_lead_ndx {
String long_name "index first lead";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "1-based index to the first /GTx/leads lead used for this beam's reference surface.";
String origname "beam_lead_ndx";
String fullnamepath "/gt2l/reference_surface_section/beam_lead_ndx";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_beam_refsurf_mss {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section Mean Sea Surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Mean sea surface height above WGS-84 reference ellipsoid at reference surface length scale, sampled from height_segment_mss (tide free).";
String origname "beam_refsurf_mss";
String fullnamepath "/gt2l/reference_surface_section/beam_refsurf_mss";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_beam_fb_hist_refsurf {
String long_name "Reference surface section freeboard histogram";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Reference surface freeboard histogram (distribution) for this reference surface section";
String origname "beam_fb_hist_refsurf";
String fullnamepath "/gt2l/reference_surface_section/beam_fb_hist_refsurf";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_beam_refsurf_geoid {
Float32 _FillValue 3.402823466e+38;
String long_name "reference surface section mean EGM2008 Geoid";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geoid height above WGS-84 reference ellipsoid at the reference surface length scale (range -107 to 86m), based on the EGM2008 model. The geoid height is in the tide-free system.";
String origname "beam_refsurf_geoid";
String fullnamepath "/gt2l/reference_surface_section/beam_refsurf_geoid";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_beam_refsurf_interp_flag {
String long_name "Reference surface section interpolation flag";
String units "1";
String source "ATBD section 5";
Int16 valid_min -1;
Int16 valid_max 3;
String contentType "referenceInformation";
String description "Identifies reference surface sections with reference surface height filled through interpolation. -1 = no valid reference surface determined; 0= reference surface computed from leads in this swath; 1 = reference surface computed by interpolation using two valid reference surface (constrained by thresholds maxgaptime and maxgapht); 2 = reference surface computed using one-point fill (linear interpolation between two adjacent valid reference surfaces, constrained by threshold maxpadtime); 3 = reference surface computed using end-point fill (missing reference surface is set to the previous or next adjacent valid reference surface, constrained by threshold maxpadtime)";
String flag_meanings "no_surf leads_in_swath inferred one-point_fill end-point_fill";
Int16 flag_values -1, 0, 1, 2, 3;
String origname "beam_refsurf_interp_flag";
String fullnamepath "/gt2l/reference_surface_section/beam_refsurf_interp_flag";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_beam_refsurf_geoid_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface geoid free-to-mean conversion";
String standard_name "geoid free2mean";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system at reference surface length scale.";
String origname "beam_refsurf_geoid_free2mean";
String fullnamepath "/gt2l/reference_surface_section/beam_refsurf_geoid_free2mean";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_longitude {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Center longitude of reference surface section";
String standard_name "longitude";
String units "degrees_east";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center longitude of reference surface section (mean of all freeboard longitudes)";
String origname "longitude";
String fullnamepath "/gt2l/reference_surface_section/longitude";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude";
}
gt2l_reference_surface_section_beam_refsurf_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section height mean";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface section mean height - weighted combination of leads in this beam for this reference surface section. The reference surface height is relative to the tide-free MSS.";
String origname "beam_refsurf_height";
String fullnamepath "/gt2l/reference_surface_section/beam_refsurf_height";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_latitude {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Center latitude of reference surface section";
String standard_name "latitude";
String units "degrees_north";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center latitude of reference surface section (mean of all freeboard latitudes)";
String origname "latitude";
String fullnamepath "/gt2l/reference_surface_section/latitude";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_beam_refsurf_earth_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section solid earth tide free-to-mean conversion";
String standard_name "solid earth tide free2mean";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Additive value to convert solid earth tide from the tide-free system to the mean-tide system at reference surface length scale.";
String origname "beam_refsurf_earth_free2mean";
String fullnamepath "/gt2l/reference_surface_section/beam_refsurf_earth_free2mean";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_beam_fb_unc_refsurf {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean freeboard uncertainty";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Freeboard uncertainty estimate from the reference surface section mean freeboard, sampled from beam_freeboard/beam_fb_unc";
String origname "beam_fb_unc_refsurf";
String fullnamepath "/gt2l/reference_surface_section/beam_fb_unc_refsurf";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_beam_fb_length_refsurf_sum {
Float32 _FillValue 3.402823466e+38;
String long_name "Total length of freeboard segments";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Length of freeboard beam-segments within this reference surface section";
String origname "beam_fb_length_refsurf_sum";
String fullnamepath "/gt2l/reference_surface_section/beam_fb_length_refsurf_sum";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_fbswath_ndx {
String long_name "Index to freeboard swath segment";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "The 1-based fbswath_nx identifies the swath associated with each element. There are the same number of elements in the group /freeboard_swath_segment and in each of the /GTx/freeboard_beam_segment groups. The fbswath_nx identifies the fbswath_refsurf_height used to compute the fbswath_fb_height. It is the same index number that idenitifies the beam_refsurf_height to its swath and the beam_refsurf_height used to computed the beam_fb_height.";
String origname "fbswath_ndx";
String fullnamepath "/gt2l/reference_surface_section/fbswath_ndx";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_beam_refsurf_dist_x {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Along track distance";
String standard_name "distance";
String units "m";
String source "atl07";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing. Distance is calculated by averaging distance of all leads contained in reference surface.";
String origname "beam_refsurf_dist_x";
String fullnamepath "/gt2l/reference_surface_section/beam_refsurf_dist_x";
String coordinates "gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_beam_fb_refsurf {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean reference surface section freeboard";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Mean segment length weighted reference surface freeboard.";
String origname "beam_fb_refsurf";
String fullnamepath "/gt2l/reference_surface_section/beam_fb_refsurf";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_reference_surface_section_beam_lead_n {
String long_name "Number of leads";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Number of leads used for this beam reference surface section";
String origname "beam_lead_n";
String fullnamepath "/gt2l/reference_surface_section/beam_lead_n";
String coordinates "gt2l_reference_surface_section_delta_time gt2l_reference_surface_section_latitude gt2l_reference_surface_section_longitude";
}
gt2l_leads_lead_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead sigma estimate";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Lead height sigma (standard deviation) estimate - weighted combination of sea surface height sigmas used as leads in this beam for this swath segment";
String origname "lead_sigma";
String fullnamepath "/gt2l/leads/lead_sigma";
String coordinates "gt2l_leads_delta_time gt2l_leads_latitude gt2l_leads_longitude";
}
gt2l_leads_lead_dist_x {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Along Track Distance";
String standard_name "distance";
String units "m";
String source "atl07";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing. Distance is calculated by averaging distance of all ssh segments contained in lead.";
String origname "lead_dist_x";
String fullnamepath "/gt2l/leads/lead_dist_x";
String coordinates "gt2l_leads_latitude gt2l_leads_longitude";
}
gt2l_leads_longitude {
String long_name "Center longitude of lead";
String standard_name "longitude";
String units "degrees_east";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center longitude of lead (mean of all freeboard longitudes)";
String origname "longitude";
String fullnamepath "/gt2l/leads/longitude";
String coordinates "gt2l_leads_delta_time gt2l_leads_latitude";
}
gt2l_leads_latitude {
String long_name "Center latitude of lead";
String standard_name "latitude";
String units "degrees_north";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center latitude of lead (mean of all sea surface height latitudes)";
String origname "latitude";
String fullnamepath "/gt2l/leads/latitude";
String coordinates "gt2l_leads_delta_time gt2l_leads_longitude";
}
gt2l_leads_lead_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead height";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Lead height - weighted mean of consective sea surface heights used for this lead. The lead height is relative to the tide-free MSS.";
String origname "lead_height";
String fullnamepath "/gt2l/leads/lead_height";
String coordinates "gt2l_leads_delta_time gt2l_leads_latitude gt2l_leads_longitude";
}
gt2l_leads_ssh_ndx {
String long_name "index first sea surface";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "1-based index to the first freeboard element (i.e.first sea surface height segment) used for this lead";
String origname "ssh_ndx";
String fullnamepath "/gt2l/leads/ssh_ndx";
String coordinates "gt2l_leads_delta_time gt2l_leads_latitude gt2l_leads_longitude";
}
gt2l_leads_ssh_n {
String long_name "number of sea surface references";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Number of sea surface height segments used for this lead";
String origname "ssh_n";
String fullnamepath "/gt2l/leads/ssh_n";
String coordinates "gt2l_leads_delta_time gt2l_leads_latitude gt2l_leads_longitude";
}
gt2l_leads_lead_length {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead size";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Along-track length of this lead";
String origname "lead_length";
String fullnamepath "/gt2l/leads/lead_length";
String coordinates "gt2l_leads_delta_time gt2l_leads_latitude gt2l_leads_longitude";
}
ancillary_data_release {
String long_name "Release Number";
String units "1";
String source "Operations";
String contentType "auxiliaryInformation";
String description "Release number of the granule. The release number is incremented when the software or ancillary data used to create the granule has been changed.";
String origname "release";
String fullnamepath "/ancillary_data/release";
}
ancillary_data_end_geoseg {
String long_name "Ending Geolocation Segment";
String units "1";
String source "Derived";
String contentType "auxiliaryInformation";
String description "The ending geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation.";
String origname "end_geoseg";
String fullnamepath "/ancillary_data/end_geoseg";
}
ancillary_data_version {
String long_name "Version";
String units "1";
String source "Operations";
String contentType "auxiliaryInformation";
String description "Version number of this granule within the release. It is a sequential number corresponding to the number of times the granule has been reprocessed for the current release.";
String origname "version";
String fullnamepath "/ancillary_data/version";
}
ancillary_data_end_region {
String long_name "Ending Region";
String units "1";
String source "Derived";
String contentType "auxiliaryInformation";
String description "The ending product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent.";
String origname "end_region";
String fullnamepath "/ancillary_data/end_region";
}
ancillary_data_atlas_sdp_gps_epoch {
String long_name "ATLAS Epoch Offset";
String units "seconds since 1980-01-06T00:00:00.000000Z";
String source "Operations";
String contentType "auxiliaryInformation";
String description "Number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS Standard Data Product (SDP) epoch (2018-01-01:T00.00.00.000000 UTC). Add this value to delta time parameters to compute full gps_seconds (relative to the GPS epoch) for each data point.";
String origname "atlas_sdp_gps_epoch";
String fullnamepath "/ancillary_data/atlas_sdp_gps_epoch";
}
ancillary_data_end_rgt {
String long_name "Ending Reference Groundtrack";
String units "1";
String source "Derived";
Int32 valid_min 1;
Int32 valid_max 1387;
String contentType "auxiliaryInformation";
String description "The ending reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle.";
String origname "end_rgt";
String fullnamepath "/ancillary_data/end_rgt";
}
ancillary_data_end_delta_time {
String long_name "ATLAS End Time (Actual)";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived";
String contentType "auxiliaryInformation";
String description "Number of GPS seconds since the ATLAS SDP epoch at the last data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String origname "end_delta_time";
String fullnamepath "/ancillary_data/end_delta_time";
}
ancillary_data_end_orbit {
String long_name "Ending Orbit Number";
String units "1";
String source "Derived";
String contentType "auxiliaryInformation";
String description "The ending orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth.";
String origname "end_orbit";
String fullnamepath "/ancillary_data/end_orbit";
}
ancillary_data_freeboard_estimation_min_refsurf_count {
String long_name "Minimum Reference Surfaces Count";
String units "1";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "ATL10 granules with less than this number of strong beam reference surface sections will be marked as failed.";
String origname "min_refsurf_count";
String fullnamepath "/ancillary_data/freeboard_estimation/min_refsurf_count";
}
ancillary_data_freeboard_estimation_fbswath_fb_hist_max {
String long_name "Freeboard Histogram Maximum Height";
String units "meters";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Freeboard histogram maximum height bin center for any swath segment.";
String origname "fbswath_fb_hist_max";
String fullnamepath "/ancillary_data/freeboard_estimation/fbswath_fb_hist_max";
}
ancillary_data_freeboard_estimation_multi_beam_disable_flag {
String long_name "miltibeam_disable_flag";
String units "1";
String source "Sea Ice ATBD";
Int32 valid_min 0;
Int32 valid_max 1;
String contentType "auxiliaryInformation";
String description "disable multi-beam (intra-pair and inter-pair) freeboard calculations";
String flag_meanings "no yes";
Int32 flag_values 0, 1;
String origname "multi_beam_disable_flag";
String fullnamepath "/ancillary_data/freeboard_estimation/multi_beam_disable_flag";
}
ancillary_data_freeboard_estimation_fbswath_fb_hist_min {
String long_name "Freeboard Histogram Minimum Height";
String units "meters";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Freeboard histogram minimum height bin center for any swath segment.";
String origname "fbswath_fb_hist_min";
String fullnamepath "/ancillary_data/freeboard_estimation/fbswath_fb_hist_min";
}
ancillary_data_freeboard_estimation_fill_height_pct {
String long_name "fill_height_pct";
String units "1";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "percentile of sorted heights (in fraction)";
String origname "fill_height_pct";
String fullnamepath "/ancillary_data/freeboard_estimation/fill_height_pct";
}
ancillary_data_freeboard_estimation_ic_thresh1 {
String long_name "minimum ice concentration filter 1";
String units "1";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Minimum ice concentration for filtering reference surfaces";
String origname "ic_thresh1";
String fullnamepath "/ancillary_data/freeboard_estimation/ic_thresh1";
}
ancillary_data_freeboard_estimation_l {
String long_name "fb_seg_len";
String units "meters";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Along track section length for freeboard calculations";
String origname "l";
String fullnamepath "/ancillary_data/freeboard_estimation/l";
}
ancillary_data_freeboard_estimation_refsurf_slope_fill {
String long_name "ssh_slope_fill";
String units "degrees";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Filled SSH sloper estimate";
String origname "refsurf_slope_fill";
String fullnamepath "/ancillary_data/freeboard_estimation/refsurf_slope_fill";
}
ancillary_data_freeboard_estimation_ub_refsurf {
String long_name "upper_bound_refsurf";
String units "m";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Reference surface maximum height";
String origname "ub_refsurf";
String fullnamepath "/ancillary_data/freeboard_estimation/ub_refsurf";
}
ancillary_data_freeboard_estimation_maxgapht {
String long_name "max gap height";
String units "meters";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Allowable height separation between refsurf heights across time gap";
String origname "maxgapht";
String fullnamepath "/ancillary_data/freeboard_estimation/maxgapht";
}
ancillary_data_freeboard_estimation_n_fillpass {
String long_name "n_fillpass";
String units "1";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Number of passes for gap filling (DEFUNCT)";
String origname "n_fillpass";
String fullnamepath "/ancillary_data/freeboard_estimation/n_fillpass";
}
ancillary_data_freeboard_estimation_refsurf_h_offset1 {
String long_name "h_offset1";
String units "meters";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "height offset for fill refsurf bound check (DEFUNCT)";
String origname "refsurf_h_offset1";
String fullnamepath "/ancillary_data/freeboard_estimation/refsurf_h_offset1";
}
ancillary_data_freeboard_estimation_refsurf_sd_fill {
String long_name "ssh_sd_fill";
String units "meters";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Filled SSH stdev estimate";
String origname "refsurf_sd_fill";
String fullnamepath "/ancillary_data/freeboard_estimation/refsurf_sd_fill";
}
ancillary_data_freeboard_estimation_refsurf_h_offset2 {
String long_name "h_offset2";
String units "meters";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "height offset for fill refsurf estimate (DEFUNCT)";
String origname "refsurf_h_offset2";
String fullnamepath "/ancillary_data/freeboard_estimation/refsurf_h_offset2";
}
ancillary_data_freeboard_estimation_lb_refsurf {
String long_name "lower_bound_refsurf";
String units "m";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Reference surface minimum height";
String origname "lb_refsurf";
String fullnamepath "/ancillary_data/freeboard_estimation/lb_refsurf";
}
ancillary_data_freeboard_estimation_ht_thresh2 {
String long_name "height threshold 2";
String units "meters";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Refsurf height difference threshold for consecutive estimates";
String origname "ht_thresh2";
String fullnamepath "/ancillary_data/freeboard_estimation/ht_thresh2";
}
ancillary_data_freeboard_estimation_maxpadtime {
String long_name "max pad time";
String units "seconds";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Maximum allowable time gap for reference surface filling using one-point and end-point fill";
String origname "maxpadtime";
String fullnamepath "/ancillary_data/freeboard_estimation/maxpadtime";
}
ancillary_data_freeboard_estimation_min_segs_count {
String long_name "Minimum Segments Count";
String units "1";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "ATL10 granules with less than this number of strong beam freeboard segments will be marked as failed.";
String origname "min_segs_count";
String fullnamepath "/ancillary_data/freeboard_estimation/min_segs_count";
}
ancillary_data_freeboard_estimation_ht_thresh1 {
String long_name "height threshold 1";
String units "meters";
String contentType "auxiliaryInformation";
String description "Refsurf height difference threshold for low concentration cases";
String source "Sea Ice ATBD";
String origname "ht_thresh1";
String fullnamepath "/ancillary_data/freeboard_estimation/ht_thresh1";
}
ancillary_data_freeboard_estimation_refsurf_slope_ub {
String long_name "ssh_slope_ub";
String units "degrees";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Upper bound for SSH slope";
String origname "refsurf_slope_ub";
String fullnamepath "/ancillary_data/freeboard_estimation/refsurf_slope_ub";
}
ancillary_data_freeboard_estimation_mean_ocean_slp {
String long_name "mean_ocean_sea_level_pressure";
String standard_name "mean ocean sea level pressure";
String units "Pa";
String source "Sea Ice ATBD, ATL07";
String contentType "modelResult";
String description "Mean ocean sea level pressure computed using SLP from ANC10 and ocean fraction mask from ANC48, from ATL07";
String origname "mean_ocean_slp";
String fullnamepath "/ancillary_data/freeboard_estimation/mean_ocean_slp";
}
ancillary_data_freeboard_estimation_refsurf_3pt_smoother {
String long_name "refsurf_3pt_smoother_flag";
String units "1";
String source "Sea Ice ATBD";
Int32 valid_min 0;
Int32 valid_max 1;
String contentType "auxiliaryInformation";
String description "switch for reference surface 3-pt smoother";
String flag_meanings "no yes";
Int32 flag_values 0, 1;
String origname "refsurf_3pt_smoother";
String fullnamepath "/ancillary_data/freeboard_estimation/refsurf_3pt_smoother";
}
ancillary_data_freeboard_estimation_lb_n_f {
String long_name "lb_n_f";
String units "1";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Lower bounds on number of SSH estimates";
String origname "lb_n_f";
String fullnamepath "/ancillary_data/freeboard_estimation/lb_n_f";
}
ancillary_data_freeboard_estimation_fill_ub_width {
String long_name "fill_ub_width";
String units "meters";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "maximum width for fill segments (width of gaussian from fine tracking)";
String origname "fill_ub_width";
String fullnamepath "/ancillary_data/freeboard_estimation/fill_ub_width";
}
ancillary_data_freeboard_estimation_min_land_dist {
String long_name "minimum distance from land";
String units "km";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Minimum distance from land for filtering reference surface";
String origname "min_land_dist";
String fullnamepath "/ancillary_data/freeboard_estimation/min_land_dist";
}
ancillary_data_freeboard_estimation_fill_snow_depth {
String long_name "fill_snow_depth";
String units "1";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "snow depth bias for fill segments";
String origname "fill_snow_depth";
String fullnamepath "/ancillary_data/freeboard_estimation/fill_snow_depth";
}
ancillary_data_freeboard_estimation_ic_thresh2 {
String long_name "minimum ice concentration filter 2";
String units "1";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Reference surfaces estimates filtered below this ice concentration";
String origname "ic_thresh2";
String fullnamepath "/ancillary_data/freeboard_estimation/ic_thresh2";
}
ancillary_data_freeboard_estimation_maxgaptime {
String long_name "max gap time";
String units "seconds";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Maximum allowable time gap for interpolation";
String origname "maxgaptime";
String fullnamepath "/ancillary_data/freeboard_estimation/maxgaptime";
}
ancillary_data_freeboard_estimation_height_segment_fit_quality_flag_min {
String long_name "Minimum Fit Quality to Use";
String units "1";
String contentType "auxiliaryInformation";
String description "The minimum height segment fit quality flag value for which an ATL07 sea ice segment is considered for use within the freeboard height computations.";
String source "Sea Ice ATBD";
String origname "height_segment_fit_quality_flag_min";
String fullnamepath "/ancillary_data/freeboard_estimation/height_segment_fit_quality_flag_min";
}
ancillary_data_freeboard_estimation_height_segment_fit_quality_flag_max {
String long_name "Maximum Fit Quality to Use";
String units "1";
String contentType "auxiliaryInformation";
String description "The maximum height segment fit quality flag value for which an ATL07 sea ice segment is considered for use within the freeboard height computations.";
String source "Sea Ice ATBD";
String origname "height_segment_fit_quality_flag_max";
String fullnamepath "/ancillary_data/freeboard_estimation/height_segment_fit_quality_flag_max";
}
ancillary_data_freeboard_estimation_b_fr {
String long_name "b_fr";
String units "meters";
String source "Sea Ice ATBD";
String contentType "auxiliaryInformation";
String description "Bin size of the freeboard histogram";
String origname "b_fr";
String fullnamepath "/ancillary_data/freeboard_estimation/b_fr";
}
ancillary_data_start_cycle {
String long_name "Starting Cycle";
String units "1";
String source "Derived";
Int32 valid_min 0;
Int32 valid_max 99;
String contentType "auxiliaryInformation";
String description "The starting cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission.";
String origname "start_cycle";
String fullnamepath "/ancillary_data/start_cycle";
}
ancillary_data_data_end_utc {
String long_name "End UTC Time of Granule (CCSDS-A, Actual)";
String units "1";
String source "Derived";
String contentType "auxiliaryInformation";
String description "UTC (in CCSDS-A format) of the last data point within the granule.";
String origname "data_end_utc";
String fullnamepath "/ancillary_data/data_end_utc";
}
ancillary_data_control {
String long_name "Control File";
String units "1";
String source "Operations";
String contentType "auxiliaryInformation";
String description "PGE-specific control file used to generate this granule. To re-use, replace breaks (BR) with linefeeds.";
String origname "control";
String fullnamepath "/ancillary_data/control";
}
ancillary_data_start_gpssow {
String long_name "Start GPS SOW of Granule (Actual)";
String units "seconds";
String source "Derived";
String contentType "auxiliaryInformation";
String description "GPS seconds-of-week of the first data point in the granule.";
String origname "start_gpssow";
String fullnamepath "/ancillary_data/start_gpssow";
}
ancillary_data_granule_end_utc {
String long_name "End UTC Time of Granule (CCSDS-A, Requested)";
String units "1";
String source "Derived";
String contentType "auxiliaryInformation";
String description "Requested end time (in UTC CCSDS-A) of this granule.";
String origname "granule_end_utc";
String fullnamepath "/ancillary_data/granule_end_utc";
}
ancillary_data_end_cycle {
String long_name "Ending Cycle";
String units "1";
String source "Derived";
Int32 valid_min 0;
Int32 valid_max 99;
String contentType "auxiliaryInformation";
String description "The ending cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission.";
String origname "end_cycle";
String fullnamepath "/ancillary_data/end_cycle";
}
ancillary_data_granule_start_utc {
String long_name "Start UTC Time of Granule (CCSDS-A, Requested)";
String units "1";
String source "Derived";
String contentType "auxiliaryInformation";
String description "Requested start time (in UTC CCSDS-A) of this granule.";
String origname "granule_start_utc";
String fullnamepath "/ancillary_data/granule_start_utc";
}
ancillary_data_start_delta_time {
String long_name "ATLAS Start Time (Actual)";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived";
String contentType "auxiliaryInformation";
String description "Number of GPS seconds since the ATLAS SDP epoch at the first data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String origname "start_delta_time";
String fullnamepath "/ancillary_data/start_delta_time";
}
ancillary_data_start_geoseg {
String long_name "Starting Geolocation Segment";
String units "1";
String source "Derived";
String contentType "auxiliaryInformation";
String description "The starting geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation.";
String origname "start_geoseg";
String fullnamepath "/ancillary_data/start_geoseg";
}
ancillary_data_start_orbit {
String long_name "Starting Orbit Number";
String units "1";
String source "Derived";
String contentType "auxiliaryInformation";
String description "The starting orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth.";
String origname "start_orbit";
String fullnamepath "/ancillary_data/start_orbit";
}
ancillary_data_data_start_utc {
String long_name "Start UTC Time of Granule (CCSDS-A, Actual)";
String units "1";
String source "Derived";
String contentType "auxiliaryInformation";
String description "UTC (in CCSDS-A format) of the first data point within the granule.";
String origname "data_start_utc";
String fullnamepath "/ancillary_data/data_start_utc";
}
ancillary_data_end_gpsweek {
String long_name "Ending GPSWeek of Granule (Actual)";
String units "weeks from 1980-01-06";
String source "Derived";
String contentType "auxiliaryInformation";
String description "GPS week number of the last data point in the granule.";
String origname "end_gpsweek";
String fullnamepath "/ancillary_data/end_gpsweek";
}
ancillary_data_start_rgt {
String long_name "Starting Reference Groundtrack";
String units "1";
String source "Derived";
Int32 valid_min 1;
Int32 valid_max 1387;
String contentType "auxiliaryInformation";
String description "The starting reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle.";
String origname "start_rgt";
String fullnamepath "/ancillary_data/start_rgt";
}
ancillary_data_end_gpssow {
String long_name "Ending GPS SOW of Granule (Actual)";
String units "seconds";
String source "Derived";
String contentType "auxiliaryInformation";
String description "GPS seconds-of-week of the last data point in the granule.";
String origname "end_gpssow";
String fullnamepath "/ancillary_data/end_gpssow";
}
ancillary_data_start_region {
String long_name "Starting Region";
String units "1";
String source "Derived";
String contentType "auxiliaryInformation";
String description "The starting product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent.";
String origname "start_region";
String fullnamepath "/ancillary_data/start_region";
}
ancillary_data_start_gpsweek {
String long_name "Start GPSWeek of Granule (Actual)";
String units "weeks from 1980-01-06";
String source "Derived";
String contentType "auxiliaryInformation";
String description "GPS week number of the first data point in the granule.";
String origname "start_gpsweek";
String fullnamepath "/ancillary_data/start_gpsweek";
}
gt3r_freeboard_segment_heights_msw_flag {
String long_name "multiple scattering warning flag";
String units "1";
String source "ATL09";
Int16 valid_min -1;
Int16 valid_max 5;
String contentType "modelResult";
String description "Multiple Scattering warning flag. The multiple scattering warning flag (ATL09 parameter msw_flag) has values from -1 to 5 where zero means no multiple scattering and 5 the greatest. If no layers were detected, then msw_flag = 0. If blowing snow is detected and its estimated optical depth is greater than or equal to 0.5, then msw_flag = 5. If the blowing snow optical depth is less than 0.5, then msw_flag = 4. If no blowing snow is detected but there are cloud or aerosol layers detected, the msw_flag assumes values of 1 to 3 based on the height of the bottom of the lowest layer: < 1 km, msw_flag = 3; 1-3 km, msw_flag = 2; > 3km, msw_flag = 1. A value of -1 indicates that the signal to noise of the data was too low to reliably ascertain the presence of cloud or blowing snow. We expect values of -1 to occur only during daylight.";
String flag_meanings "cannot_determine no_layers layer_gt_3km layer_between_1_and_3_km layer_lt_1km blow_snow_od_lt_0.5 blow_snow_od_gt_0.5";
Int16 flag_values -1, 0, 1, 2, 3, 4, 5;
String origname "msw_flag";
String fullnamepath "/gt3r/freeboard_segment/heights/msw_flag";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_cloud_flag_atm {
String long_name "cloud flag atm";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 10;
String contentType "modelResult";
String description "Number of layers found from the backscatter profile using the DDA layer finder";
String origname "cloud_flag_atm";
String fullnamepath "/gt3r/freeboard_segment/heights/cloud_flag_atm";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_height_segment_length_seg {
Float32 _FillValue 3.402823466e+38;
String long_name "length of segment";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Along-track length of segment containing n_photons_actual (ATL07 length_seg)";
String origname "height_segment_length_seg";
String fullnamepath "/gt3r/freeboard_segment/heights/height_segment_length_seg";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_bsnow_con {
Float32 _FillValue 3.402823466e+38;
String long_name "Blowing snow confidence";
String units "1";
String source "ATL09";
String contentType "modelResult";
String description "Blowing snow confidence";
String origname "bsnow_con";
String fullnamepath "/gt3r/freeboard_segment/heights/bsnow_con";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_layer_flag {
String long_name "consolidated cloud flag";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 1;
String contentType "modelResult";
String description "This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow.";
String flag_meanings "likely_clear likely_cloudy";
Int16 flag_values 0, 1;
String origname "layer_flag";
String fullnamepath "/gt3r/freeboard_segment/heights/layer_flag";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_backgr_calc {
Float32 _FillValue 3.402823466e+38;
String long_name "background count rate calculated";
String units "hz";
String source "ATL07";
String contentType "modelResult";
String description "Calculated background count rate based on sun angle, surface slope, unit reflectance";
String origname "backgr_calc";
String fullnamepath "/gt3r/freeboard_segment/heights/backgr_calc";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_ice_conc_amsr2 {
Float32 _FillValue 3.402823466e+38;
String long_name "sea ice concentration from AMSR2 file";
String units "1";
String source "ATL07/ANC31";
String contentType "modelResult";
String description "Sea ice concentration from daily AMSR2 sea ice concentration file (ANC49)";
String origname "ice_conc_amsr2";
String fullnamepath "/gt3r/freeboard_segment/heights/ice_conc_amsr2";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_bsnow_h {
Float32 _FillValue 3.402823466e+38;
String long_name "Blowing snow top height";
String units "meters";
String source "ATL09";
String contentType "modelResult";
String description "Blowing snow layer top height";
String origname "bsnow_h";
String fullnamepath "/gt3r/freeboard_segment/heights/bsnow_h";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+, Lon of segment center";
String origname "longitude";
String fullnamepath "/gt3r/freeboard_segment/heights/longitude";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude";
}
gt3r_freeboard_segment_heights_height_segment_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "h surface sigma";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Sigma height surface error estimate - width of the trimmed histogram divided by the number of photons.";
String origname "height_segment_sigma";
String fullnamepath "/gt3r/freeboard_segment/heights/height_segment_sigma";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_background_r_norm {
Float32 _FillValue 3.402823466e+38;
String long_name "normalized background (50 shot)";
String units "hz";
String source "ATL07";
String contentType "modelResult";
String description "Background rate normalized to a fixed solar elevation angle";
String origname "background_r_norm";
String fullnamepath "/gt3r/freeboard_segment/heights/background_r_norm";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of segment center";
String origname "latitude";
String fullnamepath "/gt3r/freeboard_segment/heights/latitude";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_height_segment_ocdepth {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment ocean depth";
String standard_name "ocdepth";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Height segment ocean depth";
String origname "height_segment_ocdepth";
String fullnamepath "/gt3r/freeboard_segment/heights/height_segment_ocdepth";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_height_segment_dist2land {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment distance to land";
String standard_name "dist2land";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Height segment distance to land";
String origname "height_segment_dist2land";
String fullnamepath "/gt3r/freeboard_segment/heights/height_segment_dist2land";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_cloud_flag_asr {
String long_name "cloud flag asr";
String units "1";
String source "ATL09";
Int16 valid_min 0;
Int16 valid_max 5;
String contentType "modelResult";
String description "Cloud flag (probability) from apparent surface reflectance. 0=clear with high confidence; 1=clear with medium confidence; 2=clear with low confidence; 3=cloudy with low confidence; 4=cloudy with medium confidence; 5=cloudy with high confidence";
String flag_meanings "clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence";
Int16 flag_values 0, 1, 2, 3, 4, 5;
String origname "cloud_flag_asr";
String fullnamepath "/gt3r/freeboard_segment/heights/cloud_flag_asr";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_ice_conc_ssmi {
Float32 _FillValue 3.402823466e+38;
String long_name "sea ice concentration";
String units "1";
String source "ATL07/ANC31";
String contentType "modelResult";
String description "Sea ice concentration from daily SSMI sea ice concentration file (ANC31)";
String origname "ice_conc_ssmi";
String fullnamepath "/gt3r/freeboard_segment/heights/ice_conc_ssmi";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_height_segment_ssh_flag {
String long_name "Sea Surface Height Flag";
String units "1";
String source "Sea Ice ATBD";
Int16 valid_min 0;
Int16 valid_max 2;
String contentType "referenceInformation";
String description "Identifiesthe height segments that are candidates for use as sea surface reference in freeboard calculations in ATL10. The flags are set as follows: 0 = sea ice; 1 = potential reference sea surface height; 2 = used in calculating reference sea surface height";
String flag_meanings "sea_ice potential_sea_ice_surface new_meaning";
Int16 flag_values 0, 1, 2;
String origname "height_segment_ssh_flag";
String fullnamepath "/gt3r/freeboard_segment/heights/height_segment_ssh_flag";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_podppd_flag {
String long_name "POD_PPD Flag";
String units "1";
String source "ATL07, ATL03, ATL02, ANC04, ANC05";
Int16 valid_min 0;
Int16 valid_max 7;
String contentType "referenceInformation";
String description "Composite POD/PPD flag that indicates the quality of input geolocation products for the specific height_segment. Value for height segment is sampled from geolocation parameter on ATL03. A non-zero value may indicate that geolocation solutions are degraded or that ATLAS is within a calibration scan period (CAL). Possible non-CAL values are: 0=Nominal; 1=POD_DEGRADE; 2=PPD_DEGRADE; 3=PODPPD_DEGRADE; possible CAL values are: 4=CAL_NOMINAL; 5=CAL_POD_DEGRADE; 6=CAL_PPD_DEGRADE; 7=CAL_PODPPD_DEGRADE. (ATL07 podppd_flag)";
String flag_meanings "nominal pod_degrade ppd_degrade podppd_degrade cal_nominal cal_pod_degrade cal_ppd_degrade new_meaning";
Int16 flag_values 0, 1, 2, 3, 4, 5, 6, 7;
String origname "podppd_flag";
String fullnamepath "/gt3r/freeboard_segment/heights/podppd_flag";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_backgr_r_200 {
Float32 _FillValue 3.402823466e+38;
String long_name "background rate 200 hz";
String units "hz";
String source "ATL09";
String contentType "modelResult";
String description "Background count rate, averaged over the segment based on ATLAS 50 pulse counts";
String origname "backgr_r_200";
String fullnamepath "/gt3r/freeboard_segment/heights/backgr_r_200";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_height_segment_height {
Float32 _FillValue 3.402823466e+38;
String long_name "height of segment surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Mean height from along-track segment fit determined by the sea ice algorithm(ATL07 h_si). The sea ice height is relative to the tide-free MSS.";
String origname "height_segment_height";
String fullnamepath "/gt3r/freeboard_segment/heights/height_segment_height";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_height_segment_type {
String long_name "Segment surface type";
String units "1";
String source "ATBD section 4.3";
Int16 valid_min -1;
Int16 valid_max 9;
String contentType "referenceInformation";
String description "Value that indicates segment surface type as sea ice or different types of sea surface. (0=cloud covered)";
String flag_meanings "cloud_covered other specular_lead_low_w_bkg specular_lead_low specular_lead_high_w_bkg specular_lead_high dark_lead_smooth_w_bkg dark_lead_smooth dark_lead_rough_w_bkg dark_lead_rough new_meaning";
Int16 flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1;
String origname "height_segment_type";
String fullnamepath "/gt3r/freeboard_segment/heights/height_segment_type";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_height_segment_confidence {
Float32 _FillValue 3.402823466e+38;
String long_name "Surface height confidence";
String units "1";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Confidence level in the surface height estimate based on the number of photons; the background noise rate; and the error analysis (ATL07 h_confidence)";
String origname "height_segment_confidence";
String fullnamepath "/gt3r/freeboard_segment/heights/height_segment_confidence";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_asr_25 {
Float32 _FillValue 3.402823466e+38;
String long_name "Apparent surface reflectance at 25 hz";
String units "1";
String source "ATL07";
String contentType "modelResult";
String description "Apparent surface reflectance at 25 hz, average to the sea ice segment";
String origname "asr_25";
String fullnamepath "/gt3r/freeboard_segment/heights/asr_25";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_height_segment_w_gaussian {
Float32 _FillValue 3.402823466e+38;
String long_name "width of best fit gaussian";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Width of best fit gaussian (ATL07 w_gaussian)";
String origname "height_segment_w_gaussian";
String fullnamepath "/gt3r/freeboard_segment/heights/height_segment_w_gaussian";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_photon_rate {
Float32 _FillValue 3.402823466e+38;
String long_name "photon rate";
String units "1";
String source "ATL07";
String contentType "modelResult";
String description "Photon count rate, averaged over sea ice segment.";
String origname "photon_rate";
String fullnamepath "/gt3r/freeboard_segment/heights/photon_rate";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_backgr_r_25 {
Float32 _FillValue 3.402823466e+38;
String long_name "background rate 25 hz";
String units "hz";
String source "ATL09";
String contentType "modelResult";
String description "Background count rate, averaged over the segment based on 25 hz atmosphere";
String origname "backgr_r_25";
String fullnamepath "/gt3r/freeboard_segment/heights/backgr_r_25";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_heights_height_segment_rms {
Float32 _FillValue 3.402823466e+38;
String long_name "height rms";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "RMS difference between sea ice modeled and observed photon height distribution (ATL07 h_rms)";
String origname "height_segment_rms";
String fullnamepath "/gt3r/freeboard_segment/heights/height_segment_rms";
String coordinates "gt3r_freeboard_segment_heights_delta_time gt3r_freeboard_segment_heights_latitude gt3r_freeboard_segment_heights_longitude";
}
gt3r_freeboard_segment_height_segment_id {
String units "1";
String long_name "Identifier of each height segment";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Identifier of each height segment";
String origname "height_segment_id";
String fullnamepath "/gt3r/freeboard_segment/height_segment_id";
String coordinates "gt3r_freeboard_segment_delta_time gt3r_freeboard_segment_latitude gt3r_freeboard_segment_longitude";
}
gt3r_freeboard_segment_beam_fb_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard height relative to beam_refsurf_height";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Freeboard height based on ATL07 ice surface height relative to beam_refsurf_height.";
String origname "beam_fb_height";
String fullnamepath "/gt3r/freeboard_segment/beam_fb_height";
String coordinates "gt3r_freeboard_segment_delta_time gt3r_freeboard_segment_latitude gt3r_freeboard_segment_longitude";
}
gt3r_freeboard_segment_beam_fb_unc {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard segment uncertainty";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Combined uncertainty from the height segment sigma and the reference surface sigma estimates";
String origname "beam_fb_unc";
String fullnamepath "/gt3r/freeboard_segment/beam_fb_unc";
String coordinates "gt3r_freeboard_segment_delta_time gt3r_freeboard_segment_latitude gt3r_freeboard_segment_longitude";
}
gt3r_freeboard_segment_seg_dist_x {
String long_name "Along track distance";
String units "meters";
String source "Sea Ice ATBD";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing to the segment center.";
String origname "seg_dist_x";
String fullnamepath "/gt3r/freeboard_segment/seg_dist_x";
String coordinates "gt3r_freeboard_segment_delta_time gt3r_freeboard_segment_latitude gt3r_freeboard_segment_longitude";
}
gt3r_freeboard_segment_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+, Lon of freeboard segment center";
String origname "longitude";
String fullnamepath "/gt3r/freeboard_segment/longitude";
String coordinates "gt3r_freeboard_segment_delta_time gt3r_freeboard_segment_latitude";
}
gt3r_freeboard_segment_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of freeboard segment center";
String origname "latitude";
String fullnamepath "/gt3r/freeboard_segment/latitude";
String coordinates "gt3r_freeboard_segment_delta_time gt3r_freeboard_segment_longitude";
}
gt3r_freeboard_segment_beam_refsurf_ndx {
String long_name "Index to beam refsur";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "1-based index to reference surface used for this freeboard height. Its value is identical to the fbswath_ndx. This index also identifies the beam section with which the beam freeboard associated.";
String origname "beam_refsurf_ndx";
String fullnamepath "/gt3r/freeboard_segment/beam_refsurf_ndx";
String coordinates "gt3r_freeboard_segment_delta_time gt3r_freeboard_segment_latitude gt3r_freeboard_segment_longitude";
}
gt3r_freeboard_segment_geophysical_height_segment_dac {
Float32 _FillValue 3.402823466e+38;
String long_name "Dynamic Atmosphere Correction";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect (From ATL07)";
String origname "height_segment_dac";
String fullnamepath "/gt3r/freeboard_segment/geophysical/height_segment_dac";
String coordinates "gt3r_freeboard_segment_geophysical_delta_time gt3r_freeboard_segment_geophysical_latitude gt3r_freeboard_segment_geophysical_longitude";
}
gt3r_freeboard_segment_geophysical_height_segment_tide_pole {
Float32 _FillValue 3.402823466e+38;
String long_name "Pole Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm). (From ATL07)";
String origname "height_segment_tide_pole";
String fullnamepath "/gt3r/freeboard_segment/geophysical/height_segment_tide_pole";
String coordinates "gt3r_freeboard_segment_geophysical_delta_time gt3r_freeboard_segment_geophysical_latitude gt3r_freeboard_segment_geophysical_longitude";
}
gt3r_freeboard_segment_geophysical_height_segment_ib {
Float32 _FillValue 3.402823466e+38;
String long_name "inverted barometer effect";
String units "meters";
String source "ATBD section 4.2";
String contentType "referenceInformation";
String description "Inverted barometer effect calculated from surface pressure";
String origname "height_segment_ib";
String fullnamepath "/gt3r/freeboard_segment/geophysical/height_segment_ib";
String coordinates "gt3r_freeboard_segment_geophysical_delta_time gt3r_freeboard_segment_geophysical_latitude gt3r_freeboard_segment_geophysical_longitude";
}
gt3r_freeboard_segment_geophysical_longitude {
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
String source "Sea Ice ATBD";
Float64 valid_min -180.00000000000000;
Float64 valid_max 180.00000000000000;
String contentType "referenceInformation";
String description "Longitude, WGS84, East=+,Lon of segment center";
String origname "longitude";
String fullnamepath "/gt3r/freeboard_segment/geophysical/longitude";
String coordinates "gt3r_freeboard_segment_geophysical_delta_time gt3r_freeboard_segment_geophysical_latitude";
}
gt3r_freeboard_segment_geophysical_latitude {
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
String source "Sea Ice ATBD";
Float64 valid_min -90.000000000000000;
Float64 valid_max 90.000000000000000;
String contentType "referenceInformation";
String description "Latitude, WGS84, North=+, Lat of segment center";
String origname "latitude";
String fullnamepath "/gt3r/freeboard_segment/geophysical/latitude";
String coordinates "gt3r_freeboard_segment_geophysical_delta_time gt3r_freeboard_segment_geophysical_longitude";
}
gt3r_freeboard_segment_geophysical_height_segment_load {
String units "meters";
Float32 _FillValue 3.402823466e+38;
String long_name "Load Tide";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). (From ATL07)";
String origname "height_segment_load";
String fullnamepath "/gt3r/freeboard_segment/geophysical/height_segment_load";
String coordinates "gt3r_freeboard_segment_geophysical_delta_time gt3r_freeboard_segment_geophysical_latitude gt3r_freeboard_segment_geophysical_longitude";
}
gt3r_freeboard_segment_geophysical_height_segment_geoid {
Float32 _FillValue 3.402823466e+38;
String long_name "EGM2008 Geoid";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geoid height above WGS-84 reference ellipsoid (range -107 to 86m), based on the EGM2008 model (From ATL07). The geoid height is in the tide-free system.";
String origname "height_segment_geoid";
String fullnamepath "/gt3r/freeboard_segment/geophysical/height_segment_geoid";
String coordinates "gt3r_freeboard_segment_geophysical_delta_time gt3r_freeboard_segment_geophysical_latitude gt3r_freeboard_segment_geophysical_longitude";
}
gt3r_freeboard_segment_geophysical_height_segment_ocean {
Float32 _FillValue 3.402823466e+38;
String long_name "Ocean Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium).";
String origname "height_segment_ocean";
String fullnamepath "/gt3r/freeboard_segment/geophysical/height_segment_ocean";
String coordinates "gt3r_freeboard_segment_geophysical_delta_time gt3r_freeboard_segment_geophysical_latitude gt3r_freeboard_segment_geophysical_longitude";
}
gt3r_freeboard_segment_geophysical_height_segment_dynib {
Float32 _FillValue 3.402823466e+38;
String long_name "Dynamic inverted barometer effect";
String standard_name "dynamic inverted barometer";
String units "meters";
String source "ATBD section 4.2";
String contentType "referenceInformation";
String description "Inverted barometer effect calculated from dynamic mean ocean sea level pressure (computed using ANC10 and ANC48, /ancillary_data/freeboard_estimation/mean_ocean_slp)";
String origname "height_segment_dynib";
String fullnamepath "/gt3r/freeboard_segment/geophysical/height_segment_dynib";
String coordinates "gt3r_freeboard_segment_geophysical_delta_time gt3r_freeboard_segment_geophysical_latitude gt3r_freeboard_segment_geophysical_longitude";
}
gt3r_freeboard_segment_geophysical_height_segment_earth_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Earth Tide Free-to-Mean conversion";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Additive value to convert solid earth tide from the tide-free system to the mean-tide system. (Add to height_segment_earth to get the solid earth tides in the mean-tide system.)";
String origname "height_segment_earth_free2mean";
String fullnamepath "/gt3r/freeboard_segment/geophysical/height_segment_earth_free2mean";
String coordinates "gt3r_freeboard_segment_geophysical_delta_time gt3r_freeboard_segment_geophysical_latitude gt3r_freeboard_segment_geophysical_longitude";
}
gt3r_freeboard_segment_geophysical_height_segment_geoid_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "EGM2008 Geoid Free-to-Mean conversion";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system. (Add to height_segment_geoid to get the geoid heights in the mean-tide system.)";
String origname "height_segment_geoid_free2mean";
String fullnamepath "/gt3r/freeboard_segment/geophysical/height_segment_geoid_free2mean";
String coordinates "gt3r_freeboard_segment_geophysical_delta_time gt3r_freeboard_segment_geophysical_latitude gt3r_freeboard_segment_geophysical_longitude";
}
gt3r_freeboard_segment_geophysical_height_segment_mss {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean Sea Surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Mean sea surface height above WGS-84 reference ellipsoid (range: -68 to 65m), based on a CryoSat-2/DTU14 merged product (https://doi.org/10.5281/zenodo.4294047). The MSS height (from ANC15 used in atlas_l3a_si processing) is adjusted to be in a tide free reference system (subtracting the geoid_free2mean correction) to be consistent with the tide free ATL03 heights.";
String origname "height_segment_mss";
String fullnamepath "/gt3r/freeboard_segment/geophysical/height_segment_mss";
String coordinates "gt3r_freeboard_segment_geophysical_delta_time gt3r_freeboard_segment_geophysical_latitude gt3r_freeboard_segment_geophysical_longitude";
}
gt3r_freeboard_segment_geophysical_height_segment_lpe {
Float32 _FillValue 3.402823466e+38;
String long_name "Equilibrium Tide";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Long period equilibrium tide self-consistent with ocean tide model (+-0.04m).";
String origname "height_segment_lpe";
String fullnamepath "/gt3r/freeboard_segment/geophysical/height_segment_lpe";
String coordinates "gt3r_freeboard_segment_geophysical_delta_time gt3r_freeboard_segment_geophysical_latitude gt3r_freeboard_segment_geophysical_longitude";
}
gt3r_freeboard_segment_geophysical_height_segment_earth {
String units "meters";
Float32 _FillValue 3.402823466e+38;
String long_name "Earth Tide";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Solid Earth Tide (From ATL07). The solid earth tide height is in the tide-free system.";
String origname "height_segment_earth";
String fullnamepath "/gt3r/freeboard_segment/geophysical/height_segment_earth";
String coordinates "gt3r_freeboard_segment_geophysical_delta_time gt3r_freeboard_segment_geophysical_latitude gt3r_freeboard_segment_geophysical_longitude";
}
gt3r_freeboard_segment_geoseg_beg {
String long_name "Beginning GEOSEG";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geolocation segment (geoseg) ID associated with the first photon used in this sea ice segment";
String origname "geoseg_beg";
String fullnamepath "/gt3r/freeboard_segment/geoseg_beg";
String coordinates "gt3r_freeboard_segment_delta_time gt3r_freeboard_segment_latitude gt3r_freeboard_segment_longitude";
}
gt3r_freeboard_segment_beam_fb_confidence {
Float32 _FillValue 3.402823466e+38;
String long_name "Freeboard confidence";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Confidence level in the freeboard estimate";
String origname "beam_fb_confidence";
String fullnamepath "/gt3r/freeboard_segment/beam_fb_confidence";
String coordinates "gt3r_freeboard_segment_delta_time gt3r_freeboard_segment_latitude gt3r_freeboard_segment_longitude";
}
gt3r_freeboard_segment_geoseg_end {
String long_name "Ending GEOSEG";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geolocation segment (geoseg) ID associated with the last photon used in this sea ice segment";
String origname "geoseg_end";
String fullnamepath "/gt3r/freeboard_segment/geoseg_end";
String coordinates "gt3r_freeboard_segment_delta_time gt3r_freeboard_segment_latitude gt3r_freeboard_segment_longitude";
}
gt3r_freeboard_segment_beam_fb_quality_flag {
String units "1";
String long_name "Flag describing the quality of the freeboard estimate";
String source "ATBD section 5";
Int16 valid_min -1;
Int16 valid_max 5;
String contentType "referenceInformation";
String description "Flag describing the quality of the results of the along-track fit. (-1=height value is invalid; 1=ngrid_w < wlength/2; 2=ngrid_w >= wlength/2; 3=ngrid_dt < dtlength/2; 4=ngrid_dt >= dtlength/2; 5=ngrid_dt >= (dtlength-2): where 1 is best and 5 is poor).";
String flag_meanings "invalid best high med low poor";
Int16 flag_values -1, 1, 2, 3, 4, 5;
String origname "beam_fb_quality_flag";
String fullnamepath "/gt3r/freeboard_segment/beam_fb_quality_flag";
String coordinates "gt3r_freeboard_segment_delta_time gt3r_freeboard_segment_latitude gt3r_freeboard_segment_longitude";
}
gt3r_reference_surface_section_beam_refsurf_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface height sigma";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface height sigma (standard deviation) - weighted combination of lead sigmas in this beam for this swath segment";
String origname "beam_refsurf_sigma";
String fullnamepath "/gt3r/reference_surface_section/beam_refsurf_sigma";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_beam_refsurf_alongtrack_slope {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface along track slope";
String units "degrees";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface height along track slope";
String origname "beam_refsurf_alongtrack_slope";
String fullnamepath "/gt3r/reference_surface_section/beam_refsurf_alongtrack_slope";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_beam_lead_ndx {
String long_name "index first lead";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "1-based index to the first /GTx/leads lead used for this beam's reference surface.";
String origname "beam_lead_ndx";
String fullnamepath "/gt3r/reference_surface_section/beam_lead_ndx";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_beam_refsurf_mss {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section Mean Sea Surface";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Mean sea surface height above WGS-84 reference ellipsoid at reference surface length scale, sampled from height_segment_mss (tide free).";
String origname "beam_refsurf_mss";
String fullnamepath "/gt3r/reference_surface_section/beam_refsurf_mss";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_beam_fb_hist_refsurf {
String long_name "Reference surface section freeboard histogram";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Reference surface freeboard histogram (distribution) for this reference surface section";
String origname "beam_fb_hist_refsurf";
String fullnamepath "/gt3r/reference_surface_section/beam_fb_hist_refsurf";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_beam_refsurf_geoid {
Float32 _FillValue 3.402823466e+38;
String long_name "reference surface section mean EGM2008 Geoid";
String units "meters";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Geoid height above WGS-84 reference ellipsoid at the reference surface length scale (range -107 to 86m), based on the EGM2008 model. The geoid height is in the tide-free system.";
String origname "beam_refsurf_geoid";
String fullnamepath "/gt3r/reference_surface_section/beam_refsurf_geoid";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_beam_refsurf_interp_flag {
String long_name "Reference surface section interpolation flag";
String units "1";
String source "ATBD section 5";
Int16 valid_min -1;
Int16 valid_max 3;
String contentType "referenceInformation";
String description "Identifies reference surface sections with reference surface height filled through interpolation. -1 = no valid reference surface determined; 0= reference surface computed from leads in this swath; 1 = reference surface computed by interpolation using two valid reference surface (constrained by thresholds maxgaptime and maxgapht); 2 = reference surface computed using one-point fill (linear interpolation between two adjacent valid reference surfaces, constrained by threshold maxpadtime); 3 = reference surface computed using end-point fill (missing reference surface is set to the previous or next adjacent valid reference surface, constrained by threshold maxpadtime)";
String flag_meanings "no_surf leads_in_swath inferred one-point_fill end-point_fill";
Int16 flag_values -1, 0, 1, 2, 3;
String origname "beam_refsurf_interp_flag";
String fullnamepath "/gt3r/reference_surface_section/beam_refsurf_interp_flag";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_beam_refsurf_geoid_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface geoid free-to-mean conversion";
String standard_name "geoid free2mean";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Additive value to convert geoid heights from the tide-free system to the mean-tide system at reference surface length scale.";
String origname "beam_refsurf_geoid_free2mean";
String fullnamepath "/gt3r/reference_surface_section/beam_refsurf_geoid_free2mean";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_longitude {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Center longitude of reference surface section";
String standard_name "longitude";
String units "degrees_east";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center longitude of reference surface section (mean of all freeboard longitudes)";
String origname "longitude";
String fullnamepath "/gt3r/reference_surface_section/longitude";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude";
}
gt3r_reference_surface_section_beam_refsurf_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section height mean";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Reference surface section mean height - weighted combination of leads in this beam for this reference surface section. The reference surface height is relative to the tide-free MSS.";
String origname "beam_refsurf_height";
String fullnamepath "/gt3r/reference_surface_section/beam_refsurf_height";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_latitude {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Center latitude of reference surface section";
String standard_name "latitude";
String units "degrees_north";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center latitude of reference surface section (mean of all freeboard latitudes)";
String origname "latitude";
String fullnamepath "/gt3r/reference_surface_section/latitude";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_beam_refsurf_earth_free2mean {
Float32 _FillValue 3.402823466e+38;
String long_name "Reference surface section solid earth tide free-to-mean conversion";
String standard_name "solid earth tide free2mean";
String units "meters";
String source "Sea Ice ATBD";
String contentType "modelResult";
String description "Additive value to convert solid earth tide from the tide-free system to the mean-tide system at reference surface length scale.";
String origname "beam_refsurf_earth_free2mean";
String fullnamepath "/gt3r/reference_surface_section/beam_refsurf_earth_free2mean";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_beam_fb_unc_refsurf {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean freeboard uncertainty";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Freeboard uncertainty estimate from the reference surface section mean freeboard, sampled from beam_freeboard/beam_fb_unc";
String origname "beam_fb_unc_refsurf";
String fullnamepath "/gt3r/reference_surface_section/beam_fb_unc_refsurf";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_beam_fb_length_refsurf_sum {
Float32 _FillValue 3.402823466e+38;
String long_name "Total length of freeboard segments";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Length of freeboard beam-segments within this reference surface section";
String origname "beam_fb_length_refsurf_sum";
String fullnamepath "/gt3r/reference_surface_section/beam_fb_length_refsurf_sum";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_fbswath_ndx {
String long_name "Index to freeboard swath segment";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "The 1-based fbswath_nx identifies the swath associated with each element. There are the same number of elements in the group /freeboard_swath_segment and in each of the /GTx/freeboard_beam_segment groups. The fbswath_nx identifies the fbswath_refsurf_height used to compute the fbswath_fb_height. It is the same index number that idenitifies the beam_refsurf_height to its swath and the beam_refsurf_height used to computed the beam_fb_height.";
String origname "fbswath_ndx";
String fullnamepath "/gt3r/reference_surface_section/fbswath_ndx";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_beam_refsurf_dist_x {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Along track distance";
String standard_name "distance";
String units "m";
String source "atl07";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing. Distance is calculated by averaging distance of all leads contained in reference surface.";
String origname "beam_refsurf_dist_x";
String fullnamepath "/gt3r/reference_surface_section/beam_refsurf_dist_x";
String coordinates "gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_beam_fb_refsurf {
Float32 _FillValue 3.402823466e+38;
String long_name "Mean reference surface section freeboard";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Mean segment length weighted reference surface freeboard.";
String origname "beam_fb_refsurf";
String fullnamepath "/gt3r/reference_surface_section/beam_fb_refsurf";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_reference_surface_section_beam_lead_n {
String long_name "Number of leads";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "Number of leads used for this beam reference surface section";
String origname "beam_lead_n";
String fullnamepath "/gt3r/reference_surface_section/beam_lead_n";
String coordinates "gt3r_reference_surface_section_delta_time gt3r_reference_surface_section_latitude gt3r_reference_surface_section_longitude";
}
gt3r_leads_lead_sigma {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead sigma estimate";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Lead height sigma (standard deviation) estimate - weighted combination of sea surface height sigmas used as leads in this beam for this swath segment";
String origname "lead_sigma";
String fullnamepath "/gt3r/leads/lead_sigma";
String coordinates "gt3r_leads_delta_time gt3r_leads_latitude gt3r_leads_longitude";
}
gt3r_leads_lead_dist_x {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Along Track Distance";
String standard_name "distance";
String units "m";
String source "atl07";
String contentType "physicalMeasurement";
String description "Along-track distance from the equator crossing. Distance is calculated by averaging distance of all ssh segments contained in lead.";
String origname "lead_dist_x";
String fullnamepath "/gt3r/leads/lead_dist_x";
String coordinates "gt3r_leads_latitude gt3r_leads_longitude";
}
gt3r_leads_longitude {
String long_name "Center longitude of lead";
String standard_name "longitude";
String units "degrees_east";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center longitude of lead (mean of all freeboard longitudes)";
String origname "longitude";
String fullnamepath "/gt3r/leads/longitude";
String coordinates "gt3r_leads_delta_time gt3r_leads_latitude";
}
gt3r_leads_latitude {
String long_name "Center latitude of lead";
String standard_name "latitude";
String units "degrees_north";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Center latitude of lead (mean of all sea surface height latitudes)";
String origname "latitude";
String fullnamepath "/gt3r/leads/latitude";
String coordinates "gt3r_leads_delta_time gt3r_leads_longitude";
}
gt3r_leads_lead_height {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead height";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Lead height - weighted mean of consective sea surface heights used for this lead. The lead height is relative to the tide-free MSS.";
String origname "lead_height";
String fullnamepath "/gt3r/leads/lead_height";
String coordinates "gt3r_leads_delta_time gt3r_leads_latitude gt3r_leads_longitude";
}
gt3r_leads_ssh_ndx {
String long_name "index first sea surface";
String units "1";
String source "Sea Ice ATBD";
String contentType "referenceInformation";
String description "1-based index to the first freeboard element (i.e.first sea surface height segment) used for this lead";
String origname "ssh_ndx";
String fullnamepath "/gt3r/leads/ssh_ndx";
String coordinates "gt3r_leads_delta_time gt3r_leads_latitude gt3r_leads_longitude";
}
gt3r_leads_ssh_n {
String long_name "number of sea surface references";
String units "1";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "Number of sea surface height segments used for this lead";
String origname "ssh_n";
String fullnamepath "/gt3r/leads/ssh_n";
String coordinates "gt3r_leads_delta_time gt3r_leads_latitude gt3r_leads_longitude";
}
gt3r_leads_lead_length {
Float32 _FillValue 3.402823466e+38;
String long_name "Lead size";
String units "meters";
String source "ATBD section 5";
String contentType "modelResult";
String description "Along-track length of this lead";
String origname "lead_length";
String fullnamepath "/gt3r/leads/lead_length";
String coordinates "gt3r_leads_delta_time gt3r_leads_latitude gt3r_leads_longitude";
}
gt1l_freeboard_segment_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "physicalMeasurement";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt1l/freeboard_segment/delta_time";
}
gt1l_freeboard_segment_geophysical_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "referenceInformation";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt1l/freeboard_segment/geophysical/delta_time";
}
gt1l_freeboard_segment_heights_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "referenceInformation";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt1l/freeboard_segment/heights/delta_time";
}
gt1l_leads_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "physicalMeasurement";
String description "Center time of the lead in seconds since the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt1l/leads/delta_time";
}
gt1l_reference_surface_section_delta_time {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "The center time assigned to this freeboard swath segment (mean of all freeboard times), in elapsed GPS seconds since the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt1l/reference_surface_section/delta_time";
}
gt1l_reference_surface_section_ds_si_hist_bins {
String long_name "Sea Ice Histogram Bins Dimension Scale";
String units "1";
String source "SeaIce ATBD";
String contentType "auxiliaryInformation";
String description "Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram.";
String origname "ds_si_hist_bins";
String fullnamepath "/gt1l/reference_surface_section/ds_si_hist_bins";
}
gt1r_freeboard_segment_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "physicalMeasurement";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt1r/freeboard_segment/delta_time";
}
gt1r_freeboard_segment_geophysical_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "referenceInformation";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt1r/freeboard_segment/geophysical/delta_time";
}
gt1r_freeboard_segment_heights_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "referenceInformation";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt1r/freeboard_segment/heights/delta_time";
}
gt1r_leads_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "physicalMeasurement";
String description "Center time of the lead in seconds since the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt1r/leads/delta_time";
}
gt1r_reference_surface_section_delta_time {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "The center time assigned to this freeboard swath segment (mean of all freeboard times), in elapsed GPS seconds since the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt1r/reference_surface_section/delta_time";
}
gt1r_reference_surface_section_ds_si_hist_bins {
String long_name "Sea Ice Histogram Bins Dimension Scale";
String units "1";
String source "SeaIce ATBD";
String contentType "auxiliaryInformation";
String description "Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram.";
String origname "ds_si_hist_bins";
String fullnamepath "/gt1r/reference_surface_section/ds_si_hist_bins";
}
gt2l_freeboard_segment_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "physicalMeasurement";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt2l/freeboard_segment/delta_time";
}
gt2l_freeboard_segment_geophysical_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "referenceInformation";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt2l/freeboard_segment/geophysical/delta_time";
}
gt2l_freeboard_segment_heights_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "referenceInformation";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt2l/freeboard_segment/heights/delta_time";
}
gt2l_leads_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "physicalMeasurement";
String description "Center time of the lead in seconds since the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt2l/leads/delta_time";
}
gt2l_reference_surface_section_delta_time {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "The center time assigned to this freeboard swath segment (mean of all freeboard times), in elapsed GPS seconds since the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt2l/reference_surface_section/delta_time";
}
gt2l_reference_surface_section_ds_si_hist_bins {
String long_name "Sea Ice Histogram Bins Dimension Scale";
String units "1";
String source "SeaIce ATBD";
String contentType "auxiliaryInformation";
String description "Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram.";
String origname "ds_si_hist_bins";
String fullnamepath "/gt2l/reference_surface_section/ds_si_hist_bins";
}
gt2r_freeboard_segment_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "physicalMeasurement";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt2r/freeboard_segment/delta_time";
}
gt2r_freeboard_segment_geophysical_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "referenceInformation";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt2r/freeboard_segment/geophysical/delta_time";
}
gt2r_freeboard_segment_heights_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "referenceInformation";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt2r/freeboard_segment/heights/delta_time";
}
gt2r_leads_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "physicalMeasurement";
String description "Center time of the lead in seconds since the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt2r/leads/delta_time";
}
gt2r_reference_surface_section_delta_time {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "The center time assigned to this freeboard swath segment (mean of all freeboard times), in elapsed GPS seconds since the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt2r/reference_surface_section/delta_time";
}
gt2r_reference_surface_section_ds_si_hist_bins {
String long_name "Sea Ice Histogram Bins Dimension Scale";
String units "1";
String source "SeaIce ATBD";
String contentType "auxiliaryInformation";
String description "Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram.";
String origname "ds_si_hist_bins";
String fullnamepath "/gt2r/reference_surface_section/ds_si_hist_bins";
}
gt3l_freeboard_segment_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "physicalMeasurement";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt3l/freeboard_segment/delta_time";
}
gt3l_freeboard_segment_geophysical_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "referenceInformation";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt3l/freeboard_segment/geophysical/delta_time";
}
gt3l_freeboard_segment_heights_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "referenceInformation";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt3l/freeboard_segment/heights/delta_time";
}
gt3l_leads_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "physicalMeasurement";
String description "Center time of the lead in seconds since the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt3l/leads/delta_time";
}
gt3l_reference_surface_section_delta_time {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "The center time assigned to this freeboard swath segment (mean of all freeboard times), in elapsed GPS seconds since the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt3l/reference_surface_section/delta_time";
}
gt3l_reference_surface_section_ds_si_hist_bins {
String long_name "Sea Ice Histogram Bins Dimension Scale";
String units "1";
String source "SeaIce ATBD";
String contentType "auxiliaryInformation";
String description "Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram.";
String origname "ds_si_hist_bins";
String fullnamepath "/gt3l/reference_surface_section/ds_si_hist_bins";
}
gt3r_freeboard_segment_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "physicalMeasurement";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt3r/freeboard_segment/delta_time";
}
gt3r_freeboard_segment_geophysical_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "referenceInformation";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt3r/freeboard_segment/geophysical/delta_time";
}
gt3r_freeboard_segment_heights_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "referenceInformation";
String description "Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt3r/freeboard_segment/heights/delta_time";
}
gt3r_leads_delta_time {
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "Derived via Time Tagging";
String contentType "physicalMeasurement";
String description "Center time of the lead in seconds since the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt3r/leads/delta_time";
}
gt3r_reference_surface_section_delta_time {
Float64 _FillValue 1.7976931348623157e+308;
String long_name "Elapsed GPS seconds";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "ATBD section 5";
String contentType "referenceInformation";
String description "The center time assigned to this freeboard swath segment (mean of all freeboard times), in elapsed GPS seconds since the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String coordinates "latitude longitude";
String origname "delta_time";
String fullnamepath "/gt3r/reference_surface_section/delta_time";
}
gt3r_reference_surface_section_ds_si_hist_bins {
String long_name "Sea Ice Histogram Bins Dimension Scale";
String units "1";
String source "SeaIce ATBD";
String contentType "auxiliaryInformation";
String description "Dimension scale indexing the sea ice histogram bins. The bin heights must be computed from information contained within the same group as the histogram.";
String origname "ds_si_hist_bins";
String fullnamepath "/gt3r/reference_surface_section/ds_si_hist_bins";
}
orbit_info_crossing_time {
String long_name "Ascending Node Crossing Time";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "POD/PPD";
String contentType "referenceInformation";
String description "The time, in seconds since the ATLAS SDP GPS Epoch, at which the ascending node crosses the equator. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String origname "crossing_time";
String fullnamepath "/orbit_info/crossing_time";
}
orbit_info_sc_orient_time {
String long_name "Time of Last Spacecraft Orientation Change";
String standard_name "time";
String units "seconds since 2018-01-01";
String source "POD/PPD";
String contentType "referenceInformation";
String description "The time of the last spacecraft orientation change between forward, backward and transitional flight modes, expressed in seconds since the ATLAS SDP GPS Epoch. ICESat-2 is considered to be flying forward when the weak beams are leading the strong beams; and backward when the strong beams are leading the weak beams. ICESat-2 is considered to be in transition while it is maneuvering between the two orientations. Science quality is potentially degraded while in transition mode. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.";
String origname "sc_orient_time";
String fullnamepath "/orbit_info/sc_orient_time";
}
FakeDim0 {
String units "level";
}
DODS_EXTRA {
String Unlimited_Dimension "gt1l_freeboard_segment_delta_time", "gt1l_freeboard_segment_geophysical_delta_time", "gt1l_freeboard_segment_heights_delta_time", "gt1l_leads_delta_time", "gt1l_reference_surface_section_delta_time", "gt1l_reference_surface_section_ds_si_hist_bins", "gt1r_freeboard_segment_delta_time", "gt1r_freeboard_segment_geophysical_delta_time", "gt1r_freeboard_segment_heights_delta_time", "gt1r_leads_delta_time", "gt1r_reference_surface_section_delta_time", "gt1r_reference_surface_section_ds_si_hist_bins", "gt2l_freeboard_segment_delta_time", "gt2l_freeboard_segment_geophysical_delta_time", "gt2l_freeboard_segment_heights_delta_time", "gt2l_leads_delta_time", "gt2l_reference_surface_section_delta_time", "gt2l_reference_surface_section_ds_si_hist_bins", "gt2r_freeboard_segment_delta_time", "gt2r_freeboard_segment_geophysical_delta_time", "gt2r_freeboard_segment_heights_delta_time", "gt2r_leads_delta_time", "gt2r_reference_surface_section_delta_time", "gt2r_reference_surface_section_ds_si_hist_bins", "gt3l_freeboard_segment_delta_time", "gt3l_freeboard_segment_geophysical_delta_time", "gt3l_freeboard_segment_heights_delta_time", "gt3l_leads_delta_time", "gt3l_reference_surface_section_delta_time", "gt3l_reference_surface_section_ds_si_hist_bins", "gt3r_freeboard_segment_delta_time", "gt3r_freeboard_segment_geophysical_delta_time", "gt3r_freeboard_segment_heights_delta_time", "gt3r_leads_delta_time", "gt3r_reference_surface_section_delta_time", "gt3r_reference_surface_section_ds_si_hist_bins", "orbit_info_crossing_time", "orbit_info_sc_orient_time";
}
}