OPeNDAP Data Access Form for ATL08_20181016124656_02730110_002_01.h5
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dataset: ATL08_20181016124656_02730110_002_01.h5




  • HDF5_GLOBAL
    • granule_type: ATL08
    • short_name: ATL08
    • level: 3A
    • description: This data set (ATL08) contains along-track heights above the WGS84 ellipsoid (ITRF2014 reference frame) for the ground and canopy surfaces. The canopy and ground surfaces are processed in fixed 100 m data segments, which typically contain more than 100 sig
    • contributor_name: Thomas E Neumann (thomas.neumann@nasa.gov), Thorsten Markus (thorsten.markus@nasa.gov), Suneel Bhardwaj (suneel.bhardwaj@nasa.gov) David W Hancock III (david.w.hancock@nasa.gov)
    • contributor_role: Instrument Engineer, Investigator, Principle Investigator, Data Producer, Data Producer
    • Conventions: CF-1.6
    • date_type: UTC
    • featureType: trajectory
    • geospatial_lat_units: degrees_north
    • geospatial_lon_units: degrees_east
    • identifier_product_doi: 10.5067/ATLAS/ATL08.001
    • identifier_product_doi_authority: http://dx.doi.org
    • identifier_product_type: ATL08
    • 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.
    • naming_authority: http://dx.doi.org
    • spatial_coverage_type: Horizontal
    • standard_name_vocabulary: CF-1.6
    • time_type: CCSDS UTC-A
    • date_created: 2019-08-22T21:07:29.000000Z
    • hdfversion: HDF5 1.10.3
    • history: 2019-08-22T21:07:29.000000Z;58383667-e9b3-3639-a8de-168784ceb5e9;Created by PGE atlas_l3a_ld Version 3.2
    • identifier_file_uuid: 58383667-e9b3-3639-a8de-168784ceb5e9
    • identifier_product_format_version: 3.2
    • time_coverage_duration: 461.00000000000000
    • time_coverage_end: 2018-10-16T12:54:37.000000Z
    • time_coverage_start: 2018-10-16T12:46:56.000000Z
    • geospatial_lat_min: -78.804759009697463
    • geospatial_lon_min: -153.81953845733065
    • geospatial_lat_max: -78.498235427544756
    • geospatial_lon_max: -153.32549412458567
    • publisher_name: NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center
    • publisher_email: nsidc@nsidc.org
    • publisher_url: http://nsidc.org/daac/
    • title: ATLAS/ICESat-2 L3A Land and Vegetation Height
    • identifier_file_product_type: ATL08
    • institution: National Aeronautics and Space Administration (NASA)
    • creator_name: GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System
    • summary: The purpose of ATL08 is to provide along-track land/canopy heights and associated statistics.
    • keywords: EARTH SCIENCE > BIOSPHERE > VEGETATION > NONE > NONE > NONE > NONE
    • keywords_vocabulary: NASA/GCMD Science Keywords
    • 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.
    • processing_level: 3A
    • references: http://nsidc.org/data/icesat2/data.html
    • project: ICESat-2 > Ice, Cloud, and land Elevation Satellite-2
    • instrument: ATLAS > Advanced Topographic Laser Altimeter System
    • platform: ICESat-2 > Ice, Cloud, and land Elevation Satellite-2
    • source: Spacecraft
  • orbit_info
    • Description: Contains orbit information.
    • data_rate: Varies. Data are only provided when one of the stored values (besides time) changes.
    • fullnamepath: /orbit_info
  • METADATA
    • Description: ISO19115 Structured Metadata Represented within HDF5
    • iso_19139_dataset_xml: <?xml version=\"1.0\"?> <gmd:DS_Series xsi:schemaLocation=\"http://www.isotc211.org/2005/gmi http://cdn.earthdata.nasa.gov/iso/schema/1.0/ISO19115-2_EOS.xsd\" xmlns:eos=\"http://earthdata.nasa.gov/schema/eos\" xmlns:gco=\"http://www.isotc211.org/2005/gco\" xmlns:gmd=\"http://www.isotc211.org/2005/gmd\" xmlns:gmi=\"http://www.isotc211.org/2005/gmi\" xmlns:gml=\"http://www.opengis.net/gml/3.2\" xmlns:gmx=\"http://www.isotc211.org/2005/gmx\" xmlns:gsr=\"http://www.isotc211.org/2005/gsr\" xmlns:gss=\"http://www.isotc211.org/2005/gss\" xmlns:gts=\"http://www.isotc211.org/2005/gts\" xmlns:srv=\"http://www.isotc211.org/2005/srv\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xs=\"http://www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"> <gmd:composedOf> <gmd:DS_DataSet> <gmd:has> <gmi:MI_Metadata> <gmd:fileIdentifier> <gmx:FileName>ATL08_20181016124656_02730110_002_01.h5</gmx:FileName> </gmd:fileIdentifier> <gmd:contact> <gmd:CI_ResponsibleParty> <gmd:organisationName> <gco:CharacterString>NSIDC DAAC &gt; National Snow and Ice Data Center DAAC</gco:CharacterString> </gmd:organisationName> <gmd:contactInfo> <gmd:CI_Contact> <gmd:address> <gmd:CI_Address> <gmd:electronicMailAddress> <gco:CharacterString>nsidc@nsidc.org</gco:CharacterString> </gmd:electronicMailAddress> </gmd:CI_Address> </gmd:address> <gmd:onlineResource> <gmd:CI_OnlineResource> <gmd:linkage> <gmd:URL>http://nsidc.org/daac/</gmd:URL> </gmd:linkage> </gmd:CI_OnlineResource> </gmd:onlineResource> </gmd:CI_Contact> </gmd:contactInfo> <gmd:role> <gmd:CI_RoleCode codeList=\"http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode\" codeListValue=\"pointOfContact\">pointOfContact</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:contact> <gmd:dateStamp> <gco:DateTime>2019-08-22T21:07:29.000000Z</gco:DateTime> </gmd:dateStamp> <gmd:identificationInfo> <gmd:MD_DataIdentification> <gmd:citation> <gmd:CI_Citation> <gmd:title> <gmx:FileName>ATL08_20181016124656_02730110_002_01.h5</gmx:FileName> </gmd:title> <gmd:date> <gmd:CI_Date> <gmd:date> <gco:DateTime>2019-08-22T21:07:29.000000Z</gco:DateTime> </gmd:date> <gmd:dateType> <gmd:CI_DateTypeCode codeList=\"http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode\" codeListValue=\"creation\">creation</gmd:CI_DateTypeCode> </gmd:dateType> </gmd:CI_Date> </gmd:date> <gmd:identifier> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>ATL08</gco:CharacterString> </gmd:code> <gmd:description> <gco:CharacterString>The ECS Short Name</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmd:identifier> <gmd:identifier> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>002</gco:CharacterString> </gmd:code> <gmd:description> <gco:CharacterString>The ECS Version ID</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmd:identifier> <gmd:identifier> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>ATL08_20181016124656_02730110_002_01.h5</gco:CharacterString> </gmd:code> <gmd:description> <gco:CharacterString>ProducerGranuleId</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmd:identifier> </gmd:CI_Citation> </gmd:citation> <gmd:abstract> <gco:CharacterString>The ICESat-2 ATL08 standard data product contains along-track heights of ground and canopy surface at varying length scales. Where data permits, this includes estimates of canopy height, relative canopy cover, canopy height distributions, surface roughness, surface slope/aspect, and apparent reflectance.</gco:CharacterString> </gmd:abstract> <gmd:aggregationInfo> <gmd:MD_AggregateInformation> <gmd:aggregateDataSetName> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>ATL08</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason=\"unknown\"/> <gmd:edition> <gco:CharacterString>002</gco:CharacterString> </gmd:edition> </gmd:CI_Citation> </gmd:aggregateDataSetName> <gmd:associationType> <gmd:DS_AssociationTypeCode codeList=\"http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#DS_AssociationTypeCode\" codeListValue=\"largerWorkCitation\">largerWorkCitation</gmd:DS_AssociationTypeCode> </gmd:associationType> </gmd:MD_AggregateInformation> </gmd:aggregationInfo> <gmd:language> <gco:CharacterString>eng</gco:CharacterString> </gmd:language> <gmd:extent> <gmd:EX_Extent id=\"boundingExtent\"> <gmd:geographicElement> <gmd:EX_GeographicDescription id=\"Orbit\"> <gmd:geographicIdentifier> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>AscendingCrossing: 55.413850781199955 StartLatitude: -50.000000000000000 StartDirection:D EndLatitude: -79.000000000000000 EndDirection: D</gco:CharacterString> </gmd:code> <gmd:codeSpace> <gco:CharacterString>gov.nasa.esdis.umm.orbitparameters</gco:CharacterString> </gmd:codeSpace> <gmd:description> <gco:CharacterString>OrbitParameters</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmd:geographicIdentifier> </gmd:EX_GeographicDescription> </gmd:geographicElement> <gmd:geographicElement> <gmd:EX_GeographicDescription id=\"OrbitCalculatedSpatialDomains0\"> <gmd:geographicIdentifier> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>OrbitNumber: 474 EquatorCrossingLongitude: 55.413850781199955 EquatorCrossingDateTime: 2018-10-16T11:46:46.152995Z</gco:CharacterString> </gmd:code> <gmd:codeSpace> <gco:CharacterString>gov.nasa.esdis.umm.orbitcalculatedspatialdomains</gco:CharacterString> </gmd:codeSpace> <gmd:description> <gco:CharacterString>OrbitCalculatedSpatialDomains</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmd:geographicIdentifier> </gmd:EX_GeographicDescription> </gmd:geographicElement> <gmd:temporalElement> <gmd:EX_TemporalExtent> <gmd:extent> <gml:TimePeriod gml:id=\"TIME_PERIOD_ID\"> <gml:beginPosition>2018-10-16T12:54:26.671899Z</gml:beginPosition> <gml:endPosition>2018-10-16T12:54:31.250499Z</gml:endPosition> </gml:TimePeriod> </gmd:extent> </gmd:EX_TemporalExtent> </gmd:temporalElement> </gmd:EX_Extent> </gmd:extent> </gmd:MD_DataIdentification> </gmd:identificationInfo> <gmd:dataQualityInfo> <gmd:DQ_DataQuality> <gmd:scope> <gmd:DQ_Scope> <gmd:level> <gmd:MD_ScopeCode codeList=\"http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_ScopeCode\" codeListValue=\"dataset\">dataset</gmd:MD_ScopeCode> </gmd:level> </gmd:DQ_Scope> </gmd:scope> <gmd:lineage> <gmd:LI_Lineage> <gmd:processStep> <gmi:LE_ProcessStep> <gmd:description> <gco:CharacterString>2019-08-22T21:07:29.000000Z;58383667-e9b3-3639-a8de-168784ceb5e9;Created by PGE atlas_l3a_ld Version 3.2</gco:CharacterString> </gmd:description> <gmd:dateTime> <gco:DateTime>2019-08-22T21:07:29.000000Z</gco:DateTime> </gmd:dateTime> </gmi:LE_ProcessStep> </gmd:processStep> </gmd:LI_Lineage> </gmd:lineage> </gmd:DQ_DataQuality> </gmd:dataQualityInfo> </gmi:MI_Metadata> </gmd:has> </gmd:DS_DataSet> </gmd:composedOf> <gmd:seriesMetadata gco:nilReason=\"missing\"/> </gmd:DS_Series>
    • iso_19139_series_xml: <?xml version=\"1.0\" encoding=\"UTF-8\"?> <gmd:DS_Series xmlns:eos=\"http://earthdata.nasa.gov/schema/eos\" xmlns:gco=\"http://www.isotc211.org/2005/gco\" xmlns:gmd=\"http://www.isotc211.org/2005/gmd\" xmlns:gmi=\"http://www.isotc211.org/2005/gmi\" xmlns:gml=\"http://www.opengis.net/gml/3.2\" xmlns:gmx=\"http://www.isotc211.org/2005/gmx\" xmlns:gsr=\"http://www.isotc211.org/2005/gsr\" xmlns:gss=\"http://www.isotc211.org/2005/gss\" xmlns:gts=\"http://www.isotc211.org/2005/gts\" xmlns:srv=\"http://www.isotc211.org/2005/srv\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xs=\"http://www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.isotc211.org/2005/gmi http://cdn.earthdata.nasa.gov/iso/schema/1.0/ISO19115-2_EOS.xsd\"> <gmd:composedOf gco:nilReason=\"inapplicable\"/> <gmd:seriesMetadata> <gmi:MI_Metadata> <gmd:fileIdentifier> <gco:CharacterString>ATL08.002</gco:CharacterString> </gmd:fileIdentifier> <gmd:language> <gco:CharacterString>eng</gco:CharacterString> </gmd:language> <gmd:characterSet> <gmd:MD_CharacterSetCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_CharacterSetCode\" codeListValue=\"utf8\">utf8</gmd:MD_CharacterSetCode> </gmd:characterSet> <gmd:hierarchyLevel> <gmd:MD_ScopeCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_ScopeCode\" codeListValue=\"series\">series</gmd:MD_ScopeCode> </gmd:hierarchyLevel> <gmd:contact> <gmd:CI_ResponsibleParty> <gmd:organisationName> <gco:CharacterString>NSIDC DAAC &gt; NASA National Snow and Ice Data Center Distributed Active Archive Center</gco:CharacterString> </gmd:organisationName> <gmd:contactInfo> <gmd:CI_Contact id=\"NSIDC_DAAC_CONTACT_ID\"> <gmd:phone> <gmd:CI_Telephone> <gmd:voice> <gco:CharacterString>303-492-6199</gco:CharacterString> </gmd:voice> <gmd:facsimile> <gco:CharacterString>303-492-2468</gco:CharacterString> </gmd:facsimile> </gmd:CI_Telephone> </gmd:phone> <gmd:address> <gmd:CI_Address> <gmd:deliveryPoint> <gco:CharacterString>1540 30th St Campus Box 449</gco:CharacterString> </gmd:deliveryPoint> <gmd:city> <gco:CharacterString>Boulder</gco:CharacterString> </gmd:city> <gmd:administrativeArea> <gco:CharacterString>Colorado</gco:CharacterString> </gmd:administrativeArea> <gmd:postalCode> <gco:CharacterString>80309-0449</gco:CharacterString> </gmd:postalCode> <gmd:country> <gco:CharacterString>USA</gco:CharacterString> </gmd:country> <gmd:electronicMailAddress> <gco:CharacterString>nsidc@nsidc.org</gco:CharacterString> </gmd:electronicMailAddress> </gmd:CI_Address> </gmd:address> <gmd:onlineResource> <gmd:CI_OnlineResource> <gmd:linkage> <gmd:URL>http://nsidc.org/daac/</gmd:URL> </gmd:linkage> </gmd:CI_OnlineResource> </gmd:onlineResource> <gmd:hoursOfService> <gco:CharacterString>9:00 A.M. to 5:00 P.M., U.S. Mountain Time, Monday through Friday, excluding U.S. holidays.</gco:CharacterString> </gmd:hoursOfService> <gmd:contactInstructions> <gco:CharacterString>Contact by e-mail first</gco:CharacterString> </gmd:contactInstructions> </gmd:CI_Contact> </gmd:contactInfo> <gmd:role> <gmd:CI_RoleCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_RoleCode\" codeListValue=\"pointOfContact\">pointOfContact</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:contact> <gmd:dateStamp> <gco:Date>2015-10-15</gco:Date> </gmd:dateStamp> <gmd:metadataStandardName> <gco:CharacterString>ISO 19115-2 Geographic information - Metadata - Part 2: Extensions for imagery and gridded data</gco:CharacterString> </gmd:metadataStandardName> <gmd:metadataStandardVersion> <gco:CharacterString>ISO 19115-2:2009(E)</gco:CharacterString> </gmd:metadataStandardVersion> <gmd:identificationInfo> <gmd:MD_DataIdentification> <gmd:citation> <gmd:CI_Citation> <!-- ECS extracts the LongName from here --> <!-- UMM-C expects the ShortName to precede the LongName separated by a &gt; here --> <gmd:title> <gco:CharacterString>ATLAS/ICESat-2 L3A Land and Vegetation Height</gco:CharacterString> </gmd:title> <gmd:date> <gmd:CI_Date> <!-- ECS extracts the RevisionDate from here --> <gmd:date> <gco:Date>2016-06-09</gco:Date> </gmd:date> <gmd:dateType> <gmd:CI_DateTypeCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode\" codeListValue=\"revision\">revision</gmd:CI_DateTypeCode> </gmd:dateType> </gmd:CI_Date> </gmd:date> <!-- VersionID is expected to be here by the Base Reference Metadata Model document --> <gmd:edition> <gco:CharacterString>002</gco:CharacterString> </gmd:edition> <gmd:identifier> <gmd:MD_Identifier> <!-- ECS extracts the ShortName from here --> <gmd:code> <gco:CharacterString>ATL08</gco:CharacterString> </gmd:code> <gmd:description> <gco:CharacterString>The ECS Short Name</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmd:identifier> <gmd:identifier> <gmd:MD_Identifier> <!-- ECS extracts the VersionID from here --> <gmd:code> <gco:CharacterString>002</gco:CharacterString> </gmd:code> <gmd:description> <gco:CharacterString>The ECS Version ID</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmd:identifier> <gmd:identifier> <gmd:MD_Identifier> <!-- This field provides the Digital Object Identifier (DOI). --> <gmd:code> <gmx:Anchor xlink:actuate=\"onRequest\" xlink:href=\"http://dx.doi.org/10.5067/ATLAS/ATL08.002\">doi:10.5067/ATLAS/ATL08.002</gmx:Anchor> </gmd:code> <gmd:codeSpace> <gco:CharacterString>gov.nasa.esdis</gco:CharacterString> </gmd:codeSpace> <gmd:description> <gco:CharacterString>A Digital Object Identifier (DOI)</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmd:identifier> <gmd:citedResponsibleParty> <gmd:CI_ResponsibleParty> <gmd:organisationName> <gco:CharacterString>National Aeronautics and Space Administration (NASA)</gco:CharacterString> </gmd:organisationName> <gmd:role> <gmd:CI_RoleCode codeList=\"http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode\" codeListValue=\"resourceProvider\">resourceProvider</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:citedResponsibleParty> <gmd:citedResponsibleParty> <gmd:CI_ResponsibleParty> <!-- ECS expects ProcessingCenter to be here --> <gmd:organisationName> <gco:CharacterString>GSFC I-SIPS &gt; ICESat-2 Science Investigator-led Processing System</gco:CharacterString> </gmd:organisationName> <gmd:role> <gmd:CI_RoleCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_RoleCode\" codeListValue=\"originator\">originator</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:citedResponsibleParty> <!-- ECS extracts the VersionDescription from here --> <gmd:otherCitationDetails> <gco:CharacterString>Initial version of the processing software</gco:CharacterString> </gmd:otherCitationDetails> </gmd:CI_Citation> </gmd:citation> <!-- ECS extracts the CollectionDescription from here --> <gmd:abstract> <gco:CharacterString>The ICESat-2 ATL08 standard data product contains along-track heights of ground and canopy surface at varying length scales. Where data permits, this includes estimates of canopy height, relative canopy cover, canopy height distributions, surface roughness, surface slope/aspect, and apparent reflectance.</gco:CharacterString> </gmd:abstract> <gmd:purpose> <gco:CharacterString>The purpose of ATL08 is to provide along-track land/canopy heights and associated statistics.</gco:CharacterString> </gmd:purpose> <gmd:credit> <gco:CharacterString>The software that generates the ATL08 product was designed and implemented within the ICESat-2 Science Investigator-led Processing System at the NASA Goddard Space Flight Center in Greenbelt, Maryland.</gco:CharacterString> </gmd:credit> <gmd:status> <gmd:MD_ProgressCode codeList=\"http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_ProgressCode\" codeListValue=\"onGoing\">onGoing</gmd:MD_ProgressCode> </gmd:status> <gmd:pointOfContact> <gmd:CI_ResponsibleParty> <!-- ECS expects ArchiveCenter to be here --> <gmd:organisationName> <gco:CharacterString>NSIDC DAAC &gt; NASA National Snow and Ice Data Center Distributed Active Archive Center</gco:CharacterString> </gmd:organisationName> <gmd:contactInfo xlink:href=\"#NSIDC_DAAC_CONTACT_ID\"/> <gmd:role> <gmd:CI_RoleCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_RoleCode\" codeListValue=\"distributor\">distributor</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:pointOfContact> <gmd:resourceFormat> <gmd:MD_Format> <gmd:name> <gco:CharacterString>HDF</gco:CharacterString> </gmd:name> <gmd:version> <gco:CharacterString>5</gco:CharacterString> </gmd:version> </gmd:MD_Format> </gmd:resourceFormat> <gmd:descriptiveKeywords> <gmd:MD_Keywords> <gmd:keyword> <gco:CharacterString>EARTH SCIENCE &gt; BIOSPHERE &gt; VEGETATION &gt; NONE &gt; NONE &gt; NONE &gt; NONE</gco:CharacterString> </gmd:keyword> <gmd:keyword> <gco:CharacterString>EARTH SCIENCE &gt; BIOSPHERE &gt; VEGETATION &gt; VEGETATION COVER &gt; NONE &gt; NONE &gt; NONE</gco:CharacterString> </gmd:keyword> <gmd:keyword> <gco:CharacterString>EARTH SCIENCE &gt; LAND SURFACE &gt; NONE &gt; NONE &gt; NONE &gt; NONE &gt; NONE</gco:CharacterString> </gmd:keyword> <gmd:keyword> <gco:CharacterString>EARTH SCIENCE &gt; LAND SURFACE &gt; TOPOGRAPHY &gt; SURFACE ROUGHNESS &gt; NONE &gt; NONE &gt; NONE</gco:CharacterString> </gmd:keyword> <gmd:keyword> <gco:CharacterString>EARTH SCIENCE &gt; LAND SURFACE &gt; TOPOGRAPHY &gt; TERRAIN ELEVATION &gt; NONE &gt; NONE &gt; NONE</gco:CharacterString> </gmd:keyword> <gmd:type> <gmd:MD_KeywordTypeCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode\" codeListValue=\"theme\">theme</gmd:MD_KeywordTypeCode> </gmd:type> <gmd:thesaurusName> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>NASA/GCMD Science Keywords</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason=\"unknown\"/> <gmd:citedResponsibleParty> <gmd:CI_ResponsibleParty id=\"GCMD_USO_ID\"> <gmd:organisationName> <gco:CharacterString>NASA Global Change Master Directory (GCMD) User Support Office</gco:CharacterString> </gmd:organisationName> <gmd:contactInfo> <gmd:CI_Contact> <gmd:phone gco:nilReason=\"missing\"/> <gmd:address> <gmd:CI_Address> <gmd:deliveryPoint> <gco:CharacterString>NASA Global Change Master Directory, Goddard Space Flight Center</gco:CharacterString> </gmd:deliveryPoint> <gmd:city> <gco:CharacterString>Greenbelt</gco:CharacterString> </gmd:city> <gmd:administrativeArea> <gco:CharacterString>MD</gco:CharacterString> </gmd:administrativeArea> <gmd:postalCode> <gco:CharacterString>20771</gco:CharacterString> </gmd:postalCode> <gmd:country> <gco:CharacterString>USA</gco:CharacterString> </gmd:country> <gmd:electronicMailAddress> <gco:CharacterString>gcmduso@gcmd.gsfc.nasa.gov</gco:CharacterString> </gmd:electronicMailAddress> </gmd:CI_Address> </gmd:address> <gmd:onlineResource> <gmd:CI_OnlineResource> <gmd:linkage> <gmd:URL>http://gcmd.nasa.gov/</gmd:URL> </gmd:linkage> <gmd:protocol> <gco:CharacterString>http</gco:CharacterString> </gmd:protocol> <gmd:applicationProfile> <gco:CharacterString>web browser</gco:CharacterString> </gmd:applicationProfile> <gmd:name> <gco:CharacterString>NASA Global Change Master Directory (GCMD)</gco:CharacterString> </gmd:name> <gmd:description> <gco:CharacterString>Home Page</gco:CharacterString> </gmd:description> <gmd:function> <gmd:CI_OnLineFunctionCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode\" codeListValue=\"information\">information</gmd:CI_OnLineFunctionCode> </gmd:function> </gmd:CI_OnlineResource> </gmd:onlineResource> <gmd:contactInstructions> <gco:CharacterString>http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso</gco:CharacterString> </gmd:contactInstructions> </gmd:CI_Contact> </gmd:contactInfo> <gmd:role> <gmd:CI_RoleCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_RoleCode\" codeListValue=\"custodian\">custodian</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:citedResponsibleParty> <gmd:citedResponsibleParty> <gmd:CI_ResponsibleParty id=\"GCMD_KEYWORDS_ID\"> <gmd:organisationName> <gco:CharacterString>Global Change Master Directory (GCMD)</gco:CharacterString> </gmd:organisationName> <gmd:contactInfo> <gmd:CI_Contact> <gmd:phone gco:nilReason=\"missing\"/> <gmd:address> <gmd:CI_Address> <gmd:deliveryPoint> <gco:CharacterString>NASA Global Change Master Directory, Goddard Space Flight Center</gco:CharacterString> </gmd:deliveryPoint> <gmd:city> <gco:CharacterString>Greenbelt</gco:CharacterString> </gmd:city> <gmd:administrativeArea> <gco:CharacterString>MD</gco:CharacterString> </gmd:administrativeArea> <gmd:postalCode> <gco:CharacterString>20771</gco:CharacterString> </gmd:postalCode> <gmd:country> <gco:CharacterString>USA</gco:CharacterString> </gmd:country> <gmd:electronicMailAddress> <gco:CharacterString>gcmduso@gcmd.gsfc.nasa.gov</gco:CharacterString> </gmd:electronicMailAddress> </gmd:CI_Address> </gmd:address> <gmd:onlineResource> <gmd:CI_OnlineResource> <gmd:linkage> <gmd:URL>http://gcmd.nasa.gov/Resources/valids/</gmd:URL> </gmd:linkage> <gmd:protocol> <gco:CharacterString>http</gco:CharacterString> </gmd:protocol> <gmd:applicationProfile> <gco:CharacterString>web browser</gco:CharacterString> </gmd:applicationProfile> <gmd:name> <gco:CharacterString>NASA Global Change Master Directory (GCMD) Keyword Page</gco:CharacterString> </gmd:name> <gmd:description> <gco:CharacterString>This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions.</gco:CharacterString> </gmd:description> <gmd:function> <gmd:CI_OnLineFunctionCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode\" codeListValue=\"download\">download</gmd:CI_OnLineFunctionCode> </gmd:function> </gmd:CI_OnlineResource> </gmd:onlineResource> <gmd:contactInstructions> <gco:CharacterString>http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso</gco:CharacterString> </gmd:contactInstructions> </gmd:CI_Contact> </gmd:contactInfo> <gmd:role> <gmd:CI_RoleCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_RoleCode\" codeListValue=\"custodian\">custodian</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:citedResponsibleParty> </gmd:CI_Citation> </gmd:thesaurusName> </gmd:MD_Keywords> </gmd:descriptiveKeywords> <gmd:descriptiveKeywords> <gmd:MD_Keywords> <gmd:keyword> <gco:CharacterString>GEOGRAPHIC REGION &gt; GLOBAL</gco:CharacterString> </gmd:keyword> <gmd:type> <gmd:MD_KeywordTypeCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode\" codeListValue=\"place\">place</gmd:MD_KeywordTypeCode> </gmd:type> <gmd:thesaurusName> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>NASA/GCMD Location Keywords</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason=\"unknown\"/> <gmd:citedResponsibleParty xlink:href=\"#GCMD_USO_ID\"/> <gmd:citedResponsibleParty xlink:href=\"#GCMD_KEYWORDS_ID\"/> </gmd:CI_Citation> </gmd:thesaurusName> </gmd:MD_Keywords> </gmd:descriptiveKeywords> <gmd:descriptiveKeywords> <gmd:MD_Keywords> <gmd:keyword> <gco:CharacterString>NASA/NSIDC_DAAC &gt; NASA National Snow and Ice Data Center Distributed Active Archive Center</gco:CharacterString> </gmd:keyword> <gmd:type> <gmd:MD_KeywordTypeCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode\" codeListValue=\"dataCenter\">dataCenter</gmd:MD_KeywordTypeCode> </gmd:type> <gmd:thesaurusName> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>NASA/GCMD Data Center Keywords</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason=\"unknown\"/> <gmd:citedResponsibleParty xlink:href=\"#GCMD_USO_ID\"/> <gmd:citedResponsibleParty xlink:href=\"#GCMD_KEYWORDS_ID\"/> </gmd:CI_Citation> </gmd:thesaurusName> </gmd:MD_Keywords> </gmd:descriptiveKeywords> <gmd:descriptiveKeywords> <gmd:MD_Keywords> <gmd:keyword> <gco:CharacterString>Earth Observation Satellites &gt; NASA Decadal Survey &gt; ICESAT-2 &gt; Ice, Cloud, and land Elevation Satellite-2</gco:CharacterString> </gmd:keyword> <gmd:type> <gmd:MD_KeywordTypeCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode\" codeListValue=\"platform\">platform</gmd:MD_KeywordTypeCode> </gmd:type> <gmd:thesaurusName> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>NASA/GCMD Platform Keywords</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason=\"unknown\"/> <gmd:citedResponsibleParty xlink:href=\"#GCMD_USO_ID\"/> <gmd:citedResponsibleParty xlink:href=\"#GCMD_KEYWORDS_ID\"/> </gmd:CI_Citation> </gmd:thesaurusName> </gmd:MD_Keywords> </gmd:descriptiveKeywords> <gmd:descriptiveKeywords> <gmd:MD_Keywords> <gmd:keyword> <gco:CharacterString>Earth Remote Sensing Instruments &gt; Active Remote Sensing &gt; Altimeters &gt; Lidar/Laser Altimeters &gt; ATLAS &gt; Advanced Topographic Laser Altimeter System</gco:CharacterString> </gmd:keyword> <gmd:type> <gmd:MD_KeywordTypeCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode\" codeListValue=\"instrument\">instrument</gmd:MD_KeywordTypeCode> </gmd:type> <gmd:thesaurusName> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>NASA/GCMD Instrument Keywords</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason=\"unknown\"/> <gmd:citedResponsibleParty xlink:href=\"#GCMD_USO_ID\"/> <gmd:citedResponsibleParty xlink:href=\"#GCMD_KEYWORDS_ID\"/> </gmd:CI_Citation> </gmd:thesaurusName> </gmd:MD_Keywords> </gmd:descriptiveKeywords> <gmd:resourceConstraints> <gmd:MD_Constraints> <gmd:useLimitation> <gco:CharacterString>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.</gco:CharacterString> </gmd:useLimitation> </gmd:MD_Constraints> </gmd:resourceConstraints> <gmd:language> <gco:CharacterString>eng</gco:CharacterString> </gmd:language> <gmd:topicCategory> <gmd:MD_TopicCategoryCode>geoscientificInformation</gmd:MD_TopicCategoryCode> </gmd:topicCategory> i <gmd:extent> <gmd:EX_Extent id=\"boundingExtent\"> <gmd:description> <gco:CharacterString>SpatialCoverageType=HORIZONTAL, SpatialGranuleSpatialRepresentation=ORBIT, TemporalRangeType=Continuous Range, TimeType=UTC</gco:CharacterString> </gmd:description> <gmd:geographicElement> <gmd:EX_GeographicBoundingBox> <!-- ECS extracts WestBoundingCoordinate from here --> <gmd:westBoundLongitude> <gco:Decimal>-180.0</gco:Decimal> </gmd:westBoundLongitude> <!-- ECS extracts EastBoundingCoordinate from here --> <gmd:eastBoundLongitude> <gco:Decimal>180.0</gco:Decimal> </gmd:eastBoundLongitude> <!-- ECS extracts SouthBoundingCoordinate from here --> <gmd:southBoundLatitude> <gco:Decimal>-90.0</gco:Decimal> </gmd:southBoundLatitude> <!-- ECS extracts NorthBoundingCoordinate from here --> <gmd:northBoundLatitude> <gco:Decimal>90.0</gco:Decimal> </gmd:northBoundLatitude> </gmd:EX_GeographicBoundingBox> </gmd:geographicElement> <gmd:geographicElement> <gmd:EX_GeographicDescription> <gmd:geographicIdentifier> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>SwathWidth: 36.0 Period: 96.8 InclinationAngle: 92.0 NumberOfOrbits: 0.071428571 StartCircularLatitude: 0.0</gco:CharacterString> </gmd:code> <gmd:codeSpace> <gco:CharacterString>gov.nasa.esdis.umm.orbitparameters</gco:CharacterString> </gmd:codeSpace> <gmd:description> <gco:CharacterString>OrbitParameters</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmd:geographicIdentifier> </gmd:EX_GeographicDescription> </gmd:geographicElement> <gmd:temporalElement> <gmd:EX_TemporalExtent> <gmd:extent> <gml:TimePeriod gml:id=\"TimePeriod_ID_1\"> <!-- ECS extracts RangeBeginningDate and RangeBeginningTime from here --> <gml:beginPosition>2005-01-01T00:00:00Z</gml:beginPosition> <!-- ECS extracts RangeEndingDate and RangeEndingTime from here --> <gml:endPosition>2020-12-31T23:59:59Z</gml:endPosition> </gml:TimePeriod> </gmd:extent> </gmd:EX_TemporalExtent> </gmd:temporalElement> </gmd:EX_Extent> </gmd:extent> <gmd:processingLevel> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>3A</gco:CharacterString> </gmd:code> <gmd:description gco:nilReason=\"missing\"/> </gmd:MD_Identifier> </gmd:processingLevel> </gmd:MD_DataIdentification> </gmd:identificationInfo> <gmd:contentInfo> <gmd:MD_ImageDescription> <gmd:attributeDescription gco:nilReason=\"missing\"/> <gmd:contentType gco:nilReason=\"missing\"/> <gmd:processingLevelCode> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>3A</gco:CharacterString> </gmd:code> <gmd:description gco:nilReason=\"missing\"/> </gmd:MD_Identifier> </gmd:processingLevelCode> </gmd:MD_ImageDescription> </gmd:contentInfo> <gmd:distributionInfo> <gmd:MD_Distribution> <gmd:distributionFormat> <gmd:MD_Format> <gmd:name> <gco:CharacterString>HDF</gco:CharacterString> </gmd:name> <gmd:version> <gco:CharacterString>5</gco:CharacterString> </gmd:version> </gmd:MD_Format> </gmd:distributionFormat> <gmd:distributor> <gmd:MD_Distributor> <gmd:distributorContact> <gmd:CI_ResponsibleParty> <gmd:organisationName> <gco:CharacterString>NSIDC DAAC &gt; NASA National Snow and Ice Data Center Distributed Active Archive Center</gco:CharacterString> </gmd:organisationName> <gmd:contactInfo xlink:href=\"#NSIDC_DAAC_CONTACT_ID\"/> <gmd:role> <gmd:CI_RoleCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_RoleCode\" codeListValue=\"distributor\">distributor</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:distributorContact> <gmd:distributorTransferOptions> <gmd:MD_DigitalTransferOptions> <gmd:onLine> <gmd:CI_OnlineResource> <gmd:linkage> <gmd:URL>http://nsidc.org/data/icesat2/data.html</gmd:URL> </gmd:linkage> <gmd:protocol> <gco:CharacterString>http</gco:CharacterString> </gmd:protocol> <gmd:description> <gco:CharacterString>Data Product Description Page</gco:CharacterString> </gmd:description> <gmd:function> <gmd:CI_OnLineFunctionCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode\" codeListValue=\"information\">information</gmd:CI_OnLineFunctionCode> </gmd:function> </gmd:CI_OnlineResource> </gmd:onLine> <gmd:onLine> <gmd:CI_OnlineResource> <gmd:linkage> <gmd:URL>http://nsidc.org/data/icesat2/order.html</gmd:URL> </gmd:linkage> <gmd:protocol> <gco:CharacterString>http</gco:CharacterString> </gmd:protocol> <gmd:description> <gco:CharacterString>Data Product Order Page</gco:CharacterString> </gmd:description> <gmd:function> <gmd:CI_OnLineFunctionCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode\" codeListValue=\"order\">order</gmd:CI_OnLineFunctionCode> </gmd:function> </gmd:CI_OnlineResource> </gmd:onLine> <gmd:onLine> <gmd:CI_OnlineResource> <gmd:linkage> <gmd:URL>http://dx.doi.org/10.5067/ATLAS/ATL08.002</gmd:URL> </gmd:linkage> <gmd:protocol> <gco:CharacterString>http</gco:CharacterString> </gmd:protocol> <gmd:description> <gco:CharacterString>Digital Object Identifier URL</gco:CharacterString> </gmd:description> <gmd:function> <gmd:CI_OnLineFunctionCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode\" codeListValue=\"information\">information</gmd:CI_OnLineFunctionCode> </gmd:function> </gmd:CI_OnlineResource> </gmd:onLine> </gmd:MD_DigitalTransferOptions> </gmd:distributorTransferOptions> </gmd:MD_Distributor> </gmd:distributor> </gmd:MD_Distribution> </gmd:distributionInfo> <gmi:acquisitionInformation> <gmi:MI_AcquisitionInformation> <gmi:instrument> <eos:EOS_Instrument id=\"ATLAS_INSTRUMENT_ID\"> <gmi:citation> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>ATLAS &gt; Advanced Topographic Laser Altimeter System</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason=\"unknown\"/> </gmd:CI_Citation> </gmi:citation> <gmi:identifier> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>ATLAS</gco:CharacterString> </gmd:code> <gmd:description> <gco:CharacterString>Advanced Topographic Laser Altimeter System</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmi:identifier> <gmi:type> <gco:CharacterString>Laser Altimeter</gco:CharacterString> </gmi:type> <gmi:description> <gco:CharacterString>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.</gco:CharacterString> </gmi:description> <gmi:mountedOn xlink:href=\"#ICESAT_2_PLATFORM_ID\"/> </eos:EOS_Instrument> </gmi:instrument> <gmi:operation> <!-- MI_Operation is expected to be here by the Base Reference Metadata Model document--> <gmi:MI_Operation> <gmi:description> <gco:CharacterString>ICESat-2 &gt; Ice, Cloud, and land Elevation Satellite-2</gco:CharacterString> </gmi:description> <gmi:citation> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>ICESat-2 &gt; Ice, Cloud, and land Elevation Satellite-2</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason=\"unknown\"/> </gmd:CI_Citation> </gmi:citation> <gmi:identifier> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>ICESat-2</gco:CharacterString> </gmd:code> <gmd:description> <gco:CharacterString>Ice, Cloud, and land Elevation Satellite-2</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmi:identifier> <gmi:status> <gmd:MD_ProgressCode codeList=\"http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_ProgressCode\" codeListValue=\"underDevelopment\">underDevelopment</gmd:MD_ProgressCode> </gmi:status> <gmi:parentOperation gco:nilReason=\"inapplicable\"/> <gmi:platform xlink:href=\"#ICESAT_2_PLATFORM_ID\"/> </gmi:MI_Operation> </gmi:operation> <gmi:platform> <eos:EOS_Platform id=\"ICESAT_2_PLATFORM_ID\"> <gmi:citation> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>ICESat-2 &gt; Ice, Cloud, and land Elevation Satellite-2</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason=\"unknown\"/> </gmd:CI_Citation> </gmi:citation> <gmi:identifier> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>ICESat-2</gco:CharacterString> </gmd:code> <gmd:description> <gco:CharacterString>Ice, Cloud, and land Elevation Satellite-2</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmi:identifier> <gmi:description> <gco:CharacterString>Spacecraft</gco:CharacterString> </gmi:description> <gmi:instrument xlink:href=\"#ATLAS_INSTRUMENT_ID\"/> </eos:EOS_Platform> </gmi:platform> </gmi:MI_AcquisitionInformation> </gmi:acquisitionInformation> </gmi:MI_Metadata> </gmd:seriesMetadata> </gmd:DS_Series>
    • fullnamepath: /METADATA
  • METADATA_AcquisitionInformation:
    • METADATA_AcquisitionInformation_lidar
      • pulse_rate: 10000 pps
      • wavelength: 532 nm
      • identifier: ATLAS
      • type: Laser Altimeter
      • 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.
      • fullnamepath: /METADATA/AcquisitionInformation/lidar
    • METADATA_AcquisitionInformation_lidarDocument
      • edition: Pre-Release
      • publicationDate: 12/31/17
      • title: A document describing the ATLAS instrument will be provided by the ICESat-2 Project Science Office.
      • fullnamepath: /METADATA/AcquisitionInformation/lidarDocument
    • METADATA_AcquisitionInformation_platform
      • identifier: ICESat-2
      • description: Ice, Cloud, and land Elevation Satellite-2
      • type: Spacecraft
      • fullnamepath: /METADATA/AcquisitionInformation/platform
    • METADATA_AcquisitionInformation_platformDocument
      • edition: 31-Dec-16
      • publicationDate: 31-Dec-16
      • 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
      • fullnamepath: /METADATA/AcquisitionInformation/platformDocument
    • METADATA_DataQuality
      • scope: NOT_SET
      • fullnamepath: /METADATA/DataQuality
    • METADATA_DataQuality_CompletenessOmission
      • evaluationMethodType: directInternal
      • measureDescription: TBD
      • nameOfMeasure: TBD
      • unitofMeasure: TBD
      • value: NOT_SET
      • fullnamepath: /METADATA/DataQuality/CompletenessOmission
    • METADATA_DataQuality_DomainConsistency
      • evaluationMethodType: directInternal
      • measureDescription: TBD
      • nameOfMeasure: TBD
      • unitofMeasure: TBD
      • value: NOT_SET
      • fullnamepath: /METADATA/DataQuality/DomainConsistency
    • METADATA_ProductSpecificationDocument
      • characterSet: utf8
      • edition: F
      • language: eng
      • publicationDate: 07/2019
      • ShortName: ATL08_SDP
      • title: ICESat-2-SIPS-SPEC-4262 - ATLAS Science Algorithm Standard Data Product (SDP) Volume 7 (ATL08).
      • fullnamepath: /METADATA/ProductSpecificationDocument
    • METADATA_SeriesIdentification
      • maintenanceAndUpdateFrequency: asNeeded
      • maintenanceDate: SET_BY_META
      • VersionID: 002
      • identifier_product_DOI: 10.5067/ATLAS/ATL08.001
      • language: eng
      • characterSet: utf8
      • pointOfContact: NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center
      • longName: ATLAS/ICESat-2 L3A Land and Vegetation Height
      • shortName: ATL08
      • revisionDate: 2016-06-09
      • resourceProviderOrganizationName: National Aeronautics and Space Administration (NASA)
      • abstract: The ICESat-2 ATL08 standard data product contains along-track heights of ground and canopy surface at varying length scales. Where data permits, this includes estimates of canopy height, relative canopy cover, canopy height distributions, surface roughness, surface slope/aspect, and apparent reflectance.
      • purpose: The purpose of ATL08 is to provide along-track land/canopy heights and associated statistics.
      • credit: The software that generates the ATL08 product was designed and implemented within the ICESat-2 Science Investigator-led Processing System at the NASA Goddard Space Flight Center in Greenbelt, Maryland.
      • status: onGoing
      • format: HDF
      • formatVersion: 5
      • topicCategory: geoscientificInformation
      • mission: ICESat-2 > Ice, Cloud, and land Elevation Satellite-2
      • fullnamepath: /METADATA/SeriesIdentification
    • METADATA_DatasetIdentification
      • spatialRepresentationType: along-track
      • creationDate: 2019-08-22T21:07:29.000000Z
      • uuid: 58383667-e9b3-3639-a8de-168784ceb5e9
      • fileName: ATL08_20181016124656_02730110_002_01.h5
      • VersionID: 002
      • language: eng
      • characterSet: utf8
      • shortName: ATL08
      • originatorOrganizationName: GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System
      • abstract: The ICESat-2 ATL08 standard data product contains along-track heights of ground and canopy surface at varying length scales. Where data permits, this includes estimates of canopy height, relative canopy cover, canopy height distributions, surface roughness, surface slope/aspect, and apparent reflectance.
      • purpose: The purpose of ATL08 is to provide along-track land/canopy heights and associated statistics.
      • credit: The software that generates the ATL08 product was designed and implemented within the ICESat-2 Science Investigator-led Processing System at the NASA Goddard Space Flight Center in Greenbelt, Maryland.
      • status: onGoing
      • topicCategory: geoscientificInformation
      • fullnamepath: /METADATA/DatasetIdentification
    • METADATA_Extent
      • northBoundLatitude: -78.498235427544756
      • eastBoundLongitude: -153.32549412458567
      • southBoundLatitude: -78.804759009697463
      • westBoundLongitude: -153.81953845733065
      • rangeBeginningDateTime: 2018-10-16T12:54:26.671899Z
      • rangeEndingDateTime: 2018-10-16T12:54:31.250499Z
      • fullnamepath: /METADATA/Extent
    • METADATA_QADatasetIdentification
      • 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
      • creationDate: 2019-08-22T21:08:14.000000Z
      • fileName: ATL08_20181016124656_02730110_002_01.qa
      • fullnamepath: /METADATA/QADatasetIdentification
  • METADATA_Lineage:
    • METADATA_Lineage_Control
      • 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.
      • fileName: CTL_atlas_l3a_ld_000081470.ctl
      • shortName: CNTL
      • version: 1
      • fullnamepath: /METADATA/Lineage/Control
    • METADATA_Lineage_ANC28
      • description: DTU Mean Sea Surface re-referenced to the WGS84 ellipsoid.
      • fileName: dtu13_20180705_001_01.nc
      • shortName: ANC28
      • uuid: 56f47040-a72e-3109-99c2-bc1658e6dda4
      • version: 20180705
      • fullnamepath: /METADATA/Lineage/ANC28
    • METADATA_Lineage_ANC14
      • description: Landsat Canopy Mask File
      • shortName: ANC14
      • fullnamepath: /METADATA/Lineage/ANC14
    • METADATA_Lineage_ANC06_02
      • description: ArcticDEM 32m Digital Elevation Model reformatted into HDF5.
      • fileName: arcticdem32m_20190611_001_01.h5
      • shortName: ANC06-02
      • uuid: ce07ef72-0bf4-353b-8475-fb568b029905
      • version: 20190611
      • fullnamepath: /METADATA/Lineage/ANC06-02
    • METADATA_Lineage_ANC06_03
      • description: REMA Antarctica 100m Digital Elevation Model filled and reformatted into HDF5
      • fileName: atl06rema100m_20190628_001_01.h5
      • shortName: ANC06-03
      • uuid: 3e0a81bd-bbd5-35fa-b868-3254f9355b7f
      • version: 20190628
      • fullnamepath: /METADATA/Lineage/ANC06-03
    • METADATA_Lineage_ANC25_08
      • description: HDF5 template file that defines the organization and default content of the product.
      • fileName: atl08_template.h5
      • shortName: ANC25-08
      • uuid: 1d66a513-7f12-3239-bbb1-09e62031feec
      • version: 032
      • fullnamepath: /METADATA/Lineage/ANC25-08
    • METADATA_Lineage_ANC33
      • description: Water Mask File
      • fileName: watermask_2000_20180301_001_global.h5
      • shortName: ANC33
      • uuid: 1e7d3697-c576-308d-9197-21d827ac21db
      • version: 20180301
      • fullnamepath: /METADATA/Lineage/ANC33
    • METADATA_Lineage_ANC18
      • description: Modis Land Cover Mask File
      • fileName: glcc_2012_20180226_001_global.h5
      • shortName: ANC18
      • uuid: 46e34ac9-892a-3a9d-ab7e-6a329e167a1a
      • version: 20180226
      • fullnamepath: /METADATA/Lineage/ANC18
    • METADATA_Lineage_ANC38_08
      • description: ISO 19139 XML file containing DataSet-level metadata information.
      • fileName: ATL08.002.dataset.xml
      • shortName: ANC38-08
      • uuid: 55e7a88e-6258-3bc1-844a-458ba3a595fc
      • version: 002
      • fullnamepath: /METADATA/Lineage/ANC38-08
    • METADATA_Lineage_ANC34
      • description: Urban Mask File
      • fileName: SET_BY_PGE
      • shortName: SET_BY_PGE
      • uuid: SET_BY_PGE
      • version: SET_BY_PGE
      • fullnamepath: /METADATA/Lineage/ANC34
    • METADATA_Lineage_ATL03
      • description: ICESat-2 ATLAS L2A Global Geolocated Photon data products.
      • fileName: ATL03_20181016124656_02730110_002_01.h5
      • shortName: ATL03
      • uuid: 5afc3dc0-33ba-335b-b3bb-2cc34e7c4cd5
      • version: 002
      • start_cycle: 1
      • end_cycle: 1
      • start_orbit: 474
      • end_orbit: 474
      • start_rgt: 273
      • end_rgt: 273
      • start_region: 10
      • end_region: 10
      • start_geoseg: 1280110
      • end_geoseg: 1443604
      • fullnamepath: /METADATA/Lineage/ATL03
    • METADATA_Lineage_ATL09
      • description: ICESat-2 ATLAS L3A atmosphere data products.
      • fileName: ATL09_20181016114648_02730101_002_01.h5
      • shortName: ATL09
      • uuid: 0392edf6-cdc4-3c42-9ee7-12c7c38d14af
      • version: 002
      • start_cycle: 1
      • end_cycle: 1
      • start_orbit: 474
      • end_orbit: 474
      • start_rgt: 273
      • end_rgt: 273
      • start_region: 1
      • end_region: 14
      • start_geoseg: 19
      • end_geoseg: 2007126
      • fullnamepath: /METADATA/Lineage/ATL09
    • METADATA_Lineage_ANC06_01
      • description: GMTED 7.5 arcsec Digital Elevation Model reformatted into HDF5 and re-referenced to the WGS-84 ellipsoid.
      • fileName: gmted75_20180705_001_01.h5
      • shortName: ANC06-01
      • uuid: a44debc8-29af-3744-860c-227b37a4da6f
      • version: 20180705
      • fullnamepath: /METADATA/Lineage/ANC06-01
    • METADATA_Lineage_ANC26_08
      • description: HDF5 template file that defines the organization and default content of the product metadata.
      • fileName: atl08_metadata_template.h5
      • shortName: ANC26-08
      • uuid: f2d4b804-5f00-388c-80ba-9c45b0f9aecf
      • version: 032
      • fullnamepath: /METADATA/Lineage/ANC26-08
    • METADATA_Lineage_ANC19
      • description: TAI to UTC leapsecond file retrieved from ftp://maia.usno.navy.mil/ser7/tai-utc.dat
      • fileName: tai_utc_2017.dat
      • shortName: ANC19
      • uuid: a5c65112-d05e-3263-83cd-a36f1a81acdf
      • version: 001
      • fullnamepath: /METADATA/Lineage/ANC19
    • METADATA_Lineage_ANC36_08
      • description: ISO 19139 XML file containing Series-level metadata information.
      • fileName: ATL08.002.series.xml
      • shortName: ANC36-08
      • uuid: 87849aa9-407f-3fec-9f8b-46f45b818b5e
      • version: 002
      • fullnamepath: /METADATA/Lineage/ANC36-08
  • METADATA_ProcessStep:
    • METADATA_ProcessStep_Browse
      • 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.
      • identifier: atlas_brw
      • softwareVersion: Version 2.2
      • softwareDate: Jul 31 2019
      • softwareTitle: Creates ATLAS HDF5 browse files
      • runTimeParameters: CTL_atlas_l3a_ld_000081470.ctl
      • stepDateTime: 2019-08-22T21:08:14.000000Z
      • fullnamepath: /METADATA/ProcessStep/Browse
    • METADATA_ProcessStep_Metadata
      • 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.
      • identifier: atlas_meta
      • softwareVersion: Version 4.2
      • softwareDate: Jul 31 2019
      • softwareTitle: Creates ATLAS XML metadata files
      • runTimeParameters: CTL_atlas_l3a_ld_000081470.ctl
      • stepDateTime: 2019-08-22T21:08:21.000000Z
      • fullnamepath: /METADATA/ProcessStep/Metadata
    • METADATA_ProcessStep_PGE
      • ATBDDate: 11/1/17
      • ATBDTitle: ICESat-2-SIPS-SPEC-1608 - SIPs: Land, Vegetation, and Inland Water L5 Specification Document
      • ATBDVersion: 2017 November
      • documentation: ICESat-2-SIPS-SPEC-2331 - ATLAS Science Algorithm Software Design Description (SDD) Volume 12 (atlas_l3a_ld). Revision B.
      • documentDate: 12/1/17
      • processDescription: Determines heights of ground and canopy surface. Where data permits, includes estimates of canopy height, relative canopy cover, canopy height distributions, surface roughness, surface slope/aspect and apparent reflectance.
      • identifier: atlas_l3a_ld
      • softwareVersion: Version 3.2
      • softwareDate: Jul 31 2019
      • softwareTitle: ASAS L3A Land PGE
      • runTimeParameters: CTL_atlas_l3a_ld_000081470.ctl
      • stepDateTime: 2019-08-22T21:07:29.000000Z
      • fullnamepath: /METADATA/ProcessStep/PGE
    • METADATA_ProcessStep_QA
      • 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
      • identifier: atl08_qa_util
      • softwareVersion: Version 3.2
      • softwareDate: Jul 31 2019
      • softwareTitle: ATL08 QA Utility
      • runTimeParameters: CTL_atlas_l3a_ld_000081470.ctl
      • stepDateTime: 2019-08-22T21:08:14.000000Z
      • fullnamepath: /METADATA/ProcessStep/QA
    • gt1r
      • Description: Each group contains the segments for one Ground Track. As ICESat-2 orbits the earth, sequential transmit pulses illuminate six ground tracks on the surface of the earth. The track width is approximately 14m. Each ground track is numbered, according to the laser spot number that generates a given ground track. Ground tracks are numbered from the left to the right in the direction of spacecraft travel as: 1L, 1R in the left-most pair of beams; 2L, 2R for the center pair of beams; and 3L, 3R for the right-most pair of beams.
      • atlas_pce: pce3
      • atlas_beam_type: strong
      • groundtrack_id: gt1r
      • atmosphere_profile: profile_1
      • atlas_spot_number: 5
      • sc_orientation: Forward
      • fullnamepath: /gt1r
    • gt1r_signal_photons
      • Description: Contains parameters related to individual photons.
      • data_rate: Data are stored at the signal-photon classification rate.
      • fullnamepath: /gt1r/signal_photons
    • gt1r_land_segments
      • Description: Contains data categorized as land at 100 meter intervals.
      • data_rate: Data are stored as aggregates of 100 meters.
      • fullnamepath: /gt1r/land_segments
    • gt1r_land_segments_canopy
      • Description: Contains height parameters based on the land algorithm.
      • data_rate: Data are stored as aggregates of 100 meters.
      • fullnamepath: /gt1r/land_segments/canopy
    • gt1r_land_segments_terrain
      • Description: Contains terrain parameters at a 100m aggregation.
      • data_rate: Data are stored as aggregates of 100 meters.
      • fullnamepath: /gt1r/land_segments/terrain
    • gt2r
      • Description: Each group contains the segments for one Ground Track. As ICESat-2 orbits the earth, sequential transmit pulses illuminate six ground tracks on the surface of the earth. The track width is approximately 14m. Each ground track is numbered, according to the laser spot number that generates a given ground track. Ground tracks are numbered from the left to the right in the direction of spacecraft travel as: 1L, 1R in the left-most pair of beams; 2L, 2R for the center pair of beams; and 3L, 3R for the right-most pair of beams.
      • atlas_pce: pce2
      • atlas_beam_type: strong
      • groundtrack_id: gt2r
      • atmosphere_profile: profile_2
      • atlas_spot_number: 3
      • sc_orientation: Forward
      • fullnamepath: /gt2r
    • gt2r_signal_photons
      • Description: Contains parameters related to individual photons.
      • data_rate: Data are stored at the signal-photon classification rate.
      • fullnamepath: /gt2r/signal_photons
    • gt2r_land_segments
      • Description: Contains data categorized as land at 100 meter intervals.
      • data_rate: Data are stored as aggregates of 100 meters.
      • fullnamepath: /gt2r/land_segments
    • gt2r_land_segments_canopy
      • Description: Contains height parameters based on the land algorithm.
      • data_rate: Data are stored as aggregates of 100 meters.
      • fullnamepath: /gt2r/land_segments/canopy
    • gt2r_land_segments_terrain
      • Description: Contains terrain parameters at a 100m aggregation.
      • data_rate: Data are stored as aggregates of 100 meters.
      • fullnamepath: /gt2r/land_segments/terrain
    • gt1l
      • Description: Each group contains the segments for one Ground Track. As ICESat-2 orbits the earth, sequential transmit pulses illuminate six ground tracks on the surface of the earth. The track width is approximately 14m. Each ground track is numbered, according to the laser spot number that generates a given ground track. Ground tracks are numbered from the left to the right in the direction of spacecraft travel as: 1L, 1R in the left-most pair of beams; 2L, 2R for the center pair of beams; and 3L, 3R for the right-most pair of beams.
      • atlas_pce: pce3
      • atlas_beam_type: weak
      • groundtrack_id: gt1l
      • atmosphere_profile: profile_1
      • atlas_spot_number: 6
      • sc_orientation: Forward
      • fullnamepath: /gt1l
    • gt1l_signal_photons
      • Description: Contains parameters related to individual photons.
      • data_rate: Data are stored at the signal-photon classification rate.
      • fullnamepath: /gt1l/signal_photons
    • gt1l_land_segments
      • Description: Contains data categorized as land at 100 meter intervals.
      • data_rate: Data are stored as aggregates of 100 meters.
      • fullnamepath: /gt1l/land_segments
    • gt1l_land_segments_canopy
      • Description: Contains height parameters based on the land algorithm.
      • data_rate: Data are stored as aggregates of 100 meters.
      • fullnamepath: /gt1l/land_segments/canopy
    • gt1l_land_segments_terrain
      • Description: Contains terrain parameters at a 100m aggregation.
      • data_rate: Data are stored as aggregates of 100 meters.
      • fullnamepath: /gt1l/land_segments/terrain
    • quality_assessment
      • Description: Contains quality assessment data. This may include QA counters, QA along-track data and/or QA summary data.
      • fullnamepath: /quality_assessment
    • gt3l
      • Description: Each group contains the segments for one Ground Track. As ICESat-2 orbits the earth, sequential transmit pulses illuminate six ground tracks on the surface of the earth. The track width is approximately 14m. Each ground track is numbered, according to the laser spot number that generates a given ground track. Ground tracks are numbered from the left to the right in the direction of spacecraft travel as: 1L, 1R in the left-most pair of beams; 2L, 2R for the center pair of beams; and 3L, 3R for the right-most pair of beams.
      • atlas_pce: pce1
      • atlas_beam_type: weak
      • groundtrack_id: gt3l
      • atmosphere_profile: profile_3
      • atlas_spot_number: 2
      • sc_orientation: Forward
      • fullnamepath: /gt3l
    • gt3l_signal_photons
      • Description: Contains parameters related to individual photons.
      • data_rate: Data are stored at the signal-photon classification rate.
      • fullnamepath: /gt3l/signal_photons
    • gt2l
      • Description: Each group contains the segments for one Ground Track. As ICESat-2 orbits the earth, sequential transmit pulses illuminate six ground tracks on the surface of the earth. The track width is approximately 14m. Each ground track is numbered, according to the laser spot number that generates a given ground track. Ground tracks are numbered from the left to the right in the direction of spacecraft travel as: 1L, 1R in the left-most pair of beams; 2L, 2R for the center pair of beams; and 3L, 3R for the right-most pair of beams.
      • atlas_pce: pce2
      • atlas_beam_type: weak
      • groundtrack_id: gt2l
      • atmosphere_profile: profile_2
      • atlas_spot_number: 4
      • sc_orientation: Forward
      • fullnamepath: /gt2l
    • gt2l_signal_photons
      • Description: Contains parameters related to individual photons.
      • data_rate: Data are stored at the signal-photon classification rate.
      • fullnamepath: /gt2l/signal_photons
    • ancillary_data
      • Description: Contains information ancillary to the data product. This may include product characteristics, instrument characteristics and/or processing constants.
      • data_rate: Data within this group pertain to the granule in its entirety.
      • fullnamepath: /ancillary_data
    • ancillary_data_land
      • Description: Constants used in the land_vegetation ATBD
      • fullnamepath: /ancillary_data/land
    • gt3r
      • Description: Each group contains the segments for one Ground Track. As ICESat-2 orbits the earth, sequential transmit pulses illuminate six ground tracks on the surface of the earth. The track width is approximately 14m. Each ground track is numbered, according to the laser spot number that generates a given ground track. Ground tracks are numbered from the left to the right in the direction of spacecraft travel as: 1L, 1R in the left-most pair of beams; 2L, 2R for the center pair of beams; and 3L, 3R for the right-most pair of beams.
      • atlas_pce: pce1
      • atlas_beam_type: strong
      • groundtrack_id: gt3r
      • atmosphere_profile: profile_3
      • atlas_spot_number: 1
      • sc_orientation: Forward
      • fullnamepath: /gt3r
    • gt3r_signal_photons
      • Description: Contains parameters related to individual photons.
      • data_rate: Data are stored at the signal-photon classification rate.
      • fullnamepath: /gt3r/signal_photons
    • gt3r_land_segments
      • Description: Contains data categorized as land at 100 meter intervals.
      • data_rate: Data are stored as aggregates of 100 meters.
      • fullnamepath: /gt3r/land_segments
    • gt3r_land_segments_canopy
      • Description: Contains height parameters based on the land algorithm.
      • data_rate: Data are stored as aggregates of 100 meters.
      • fullnamepath: /gt3r/land_segments/canopy
    • gt3r_land_segments_terrain
      • Description: Contains terrain parameters at a 100m aggregation.
      • data_rate: Data are stored as aggregates of 100 meters.
      • fullnamepath: /gt3r/land_segments/terrain
    • DODS_EXTRA
      • Unlimited_Dimension: gt1l_land_segments_delta_time, gt1l_signal_photons_delta_time, gt1r_land_segments_delta_time, gt1r_signal_photons_delta_time, gt2l_signal_photons_delta_time, gt2r_land_segments_delta_time, gt2r_signal_photons_delta_time, gt3l_signal_photons_delta_time, gt3r_land_segments_delta_time, gt3r_signal_photons_delta_time, orbit_info_crossing_time, orbit_info_sc_orient_time


    orbit_info_cycle_number[ orbit_info_crossing_time= 0 ..0] (Type is Int16)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: Cycle Number
      • description: A count of the number of exact repeats of this reference orbit.
      • source: Operations
      • coordinates: crossing_time
      • valid_min: 0
      • valid_max: 50
      • origname: cycle_number
      • fullnamepath: /orbit_info/cycle_number
    orbit_info_orbit_number[ orbit_info_crossing_time= 0 ..0] (Type is UInt16)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: Orbit Number
      • description: Unique identifying number for each planned ICESat-2 orbit.
      • source: Operations
      • coordinates: crossing_time
      • valid_min: 1
      • valid_max: 65000
      • origname: orbit_number
      • fullnamepath: /orbit_info/orbit_number
    orbit_info_lan[ orbit_info_crossing_time= 0 ..0] (Type is Float64)
    • attributes
      • units: degrees_east
      • contentType: referenceInformation
      • long_name: Ascending Node Longitude
      • description: Longitude at the ascending node crossing.
      • source: POD/PPD
      • coordinates: crossing_time
      • valid_min: -180.00000000000000
      • valid_max: 180.00000000000000
      • origname: lan
      • fullnamepath: /orbit_info/lan
    orbit_info_sc_orient[ orbit_info_sc_orient_time= 0 ..0] (Type is Int16)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: Spacecraft Orientation
      • 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.
      • source: POD/PPD
      • coordinates: sc_orient_time
      • flag_meanings: backward forward transition
      • flag_values: 0, 1, 2
      • valid_min: 0
      • valid_max: 2
      • origname: sc_orient
      • fullnamepath: /orbit_info/sc_orient
    orbit_info_rgt[ orbit_info_crossing_time= 0 ..0] (Type is Int16)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: Reference Ground track
      • 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.
      • source: POD/PPD
      • coordinates: crossing_time
      • valid_min: 1
      • valid_max: 1387
      • origname: rgt
      • fullnamepath: /orbit_info/rgt
    gt1r_signal_photons_classed_pc_flag[ gt1r_signal_photons_delta_time= 0 ..69380] (Type is Int16)
    • attributes
      • units: 1
      • long_name: photon land atbd classification
      • description: Land Vegetation ATBD classification flag for each photon as either noise, ground, canopy, and top of canopy. 0 = noise, 1 = ground, 2 = canopy, or 3 = top of canopy.
      • source: Land ATBD section 4.10
      • coordinates: delta_time
      • flag_meanings: noise ground canopy top_of_canopy
      • flag_values: 0, 1, 2, 3
      • origname: classed_pc_flag
      • fullnamepath: /gt1r/signal_photons/classed_pc_flag
    gt1r_signal_photons_classed_pc_indx[ gt1r_signal_photons_delta_time= 0 ..69380] (Type is Int32)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: indicies of classed photons
      • description: Index (1-based) of the ATL08 classified signal photon from the start of the ATL03 geolocation segment specified on the ATL08 product at the photon rate in the corresponding parameter, ph_segment_id. This index traces back to specific photon within a 20m segment_id on ATL03. The unique identifier for tracing each ATL08 signal photon to the corresponding photon record on ATL03 is the segment_id, orbit, cycle, and classed_pc_indx. Orbit and cycle intervals for the granule are found in the /ancillary_data. The timestamp of each orbit transition is found in the /orbit_info group.
      • source: Retained from prior a_alt_science_ph packet
      • coordinates: delta_time
      • origname: classed_pc_indx
      • fullnamepath: /gt1r/signal_photons/classed_pc_indx
    gt1r_signal_photons_d_flag[ gt1r_signal_photons_delta_time= 0 ..69380] (Type is Int16)
    • attributes
      • units: 1
      • long_name: dragann flag
      • description: Flag indicating the labeling of DRAGANN noise filtering for a given photon.
      • source: Land ATBD section 2.3.5
      • coordinates: delta_time
      • flag_meanings: noise signal
      • flag_values: 0, 1
      • origname: d_flag
      • fullnamepath: /gt1r/signal_photons/d_flag
    gt1r_signal_photons_ph_segment_id[ gt1r_signal_photons_delta_time= 0 ..69380] (Type is Int32)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: segment id of photon
      • description: Segment ID of photons tracing back to specific 20m segment_id on ATL03. The unique identifier for tracing each ATL08 signal photon to the photon on ATL03 is the segment_id, orbit, and classed_pc_indx. The unique identifier for tracing each ATL08 signal photon to the corresponding photon record on ATL03 is the segment_id, orbit, cycle, and classed_pc_indx. Orbit and cycle intervals for the granule are found in the /ancillary_data. The timestamp of each orbit transition is found in the /orbit_info group.
      • source: Retained from prior a_alt_science_ph packet
      • coordinates: delta_time
      • origname: ph_segment_id
      • fullnamepath: /gt1r/signal_photons/ph_segment_id
    gt1r_land_segments_segment_watermask[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int32)
    • attributes
      • _FillValue: 255
      • units: 1
      • long_name: segment watermask
      • description: Water mask(i.e. flag) indicating inland water as referenced from the Global Raster Water Mask(ANC33) at 250 m spatial resolution.
      • source: ATBD section 2.4.15
      • coordinates: delta_time latitude longitude
      • flag_meanings: no_water water
      • flag_values: 0, 1
      • valid_min: 0
      • valid_max: 1
      • origname: segment_watermask
      • fullnamepath: /gt1r/land_segments/segment_watermask
    gt1r_land_segments_delta_time_end[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float64)
    • attributes
      • units: seconds since 2018-01-01
      • contentType: referenceInformation
      • long_name: delta time end
      • description: Time of the last photon contained within the data segment, in 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.
      • source: Derived (gps_seconds-gps_sec_offset)
      • coordinates: delta_time latitude longitude
      • origname: delta_time_end
      • fullnamepath: /gt1r/land_segments/delta_time_end
    gt1r_land_segments_rgt[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int16)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: reference ground track
      • 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.
      • source: Operations
      • coordinates: delta_time latitude longitude
      • valid_min: 1
      • valid_max: 1387
      • origname: rgt
      • fullnamepath: /gt1r/land_segments/rgt
    gt1r_land_segments_dem_flag[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int16)
    • attributes
      • _FillValue: 127
      • units: 1
      • contentType: referenceInformation
      • long_name: dem source flag
      • description: Indicates source of the DEM height. Values: 0=None, 1=Arctic, 2=GMTED, 3=MSS, 4=Antarctic.
      • source: Atmosphere ATBD
      • coordinates: delta_time latitude longitude
      • flag_meanings: none arctic gmted mss antarctic
      • flag_values: 0, 1, 2, 3, 4
      • valid_min: 0
      • valid_max: 4
      • origname: dem_flag
      • fullnamepath: /gt1r/land_segments/dem_flag
    gt1r_land_segments_msw_flag[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int16)
    • attributes
      • _FillValue: 127
      • units: 1
      • long_name: multiple scattering warning flag
      • 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.
      • source: ATL09
      • coordinates: delta_time latitude longitude
      • 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
      • flag_values: -1, 0, 1, 2, 3, 4, 5
      • origname: msw_flag
      • fullnamepath: /gt1r/land_segments/msw_flag
    gt1r_land_segments_cloud_flag_atm[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int16)
    • attributes
      • _FillValue: 127
      • units: 1
      • long_name: cloud flag atm
      • description: Cloud confidence flag from ATL09 that indicates the number of cloud or aerosol layers identified in each 25Hz atmospheric profile. If the flag is greater than 0, aerosols or clouds could be present. Valid range is 0 - 10.
      • source: ATL09
      • coordinates: delta_time latitude longitude
      • valid_min: 0
      • valid_max: 10
      • origname: cloud_flag_atm
      • fullnamepath: /gt1r/land_segments/cloud_flag_atm
    gt1r_land_segments_snr[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • long_name: signal to noise ratio
      • description: The signal to noise ratio of geolocated photons as determined by the ratio of the superset of ATL03 signal and DRAGANN found signal photons used for processing the ATL08 segments to the background photons (i.e. noise) within the same ATL08 segments.
      • source: ATBD section 2.5.14
      • coordinates: delta_time latitude longitude
      • origname: snr
      • fullnamepath: /gt1r/land_segments/snr
    gt1r_land_segments_canopy_h_canopy[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: height canopy
      • description: 98% height of all the individual canopy relative heights for the segment above the estimated terrain surface. Relative canopy heights have been computed by differencing the canopy photon height from the estimated terrain surface.
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_canopy
      • fullnamepath: /gt1r/land_segments/canopy/h_canopy
    gt1r_land_segments_canopy_canopy_rh_conf[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int16)
    • attributes
      • units: 1
      • contentType: modelResult
      • long_name: canopy relative height confidence
      • description: Canopy relative height confidence flag based on percentage of ground and canopy photons within a segment: 0 (<5% canopy), 1 (>5% canopy, <5% ground), 2 (>5% canopy, >5% ground).
      • source: Land/Veg ATBD 13March2019, Section 2.2.21
      • coordinates: ../delta_time ../latitude ../longitude
      • flag_meanings: <5%_canopy >=5%_canopy_<5%_ground >=5%_canopy_>=5%_ground
      • flag_values: 0, 1, 2
      • valid_min: 0
      • valid_max: 2
      • origname: canopy_rh_conf
      • fullnamepath: /gt1r/land_segments/canopy/canopy_rh_conf
    gt1r_land_segments_canopy_h_median_canopy_abs[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: absolute segment median canopy height
      • description: The median of individual absolute canopy heights within segment referenced above the WGS84 Ellipsoid.
      • source: Land ATBD section 2.2.6
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_median_canopy_abs
      • fullnamepath: /gt1r/land_segments/canopy/h_median_canopy_abs
    gt1r_land_segments_canopy_h_min_canopy[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: minimum canopy height
      • description: The minimum of relative individual canopy heights within segment. Relative canopy heights have been computed by differencing the canopy photon height from the estimated terrain surface.
      • source: Land ATBD section 2.2.10
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_min_canopy
      • fullnamepath: /gt1r/land_segments/canopy/h_min_canopy
    gt1r_land_segments_canopy_h_mean_canopy_abs[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: absolute mean canopy height
      • description: Mean of the individual absolute canopy heights within segment referenced above the WGS84 Ellipsoid.
      • source: Land ATBD section 2.2.4
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_mean_canopy_abs
      • fullnamepath: /gt1r/land_segments/canopy/h_mean_canopy_abs
    gt1r_land_segments_canopy_h_median_canopy[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: median canopy height
      • description: The median of individual relative canopy heights within segment. Relative canopy heights have been computed by differencing the canopy photon height from the estimated terrain surface. This parameter should be equivalent to RH50 reported in the literature.
      • source: Land ATBD section 2.2.8
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_median_canopy
      • fullnamepath: /gt1r/land_segments/canopy/h_median_canopy
    gt1r_land_segments_canopy_h_canopy_abs[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: absolute segment canopy height
      • description: The 98% height of all the absolute individual canopy heights referenced above the WGS84 ellipsoid.
      • source: Land ATBD section 2.2.2
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_canopy_abs
      • fullnamepath: /gt1r/land_segments/canopy/h_canopy_abs
    gt1r_land_segments_canopy_toc_roughness[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: top of canopy roughness
      • description: Standard deviation of the relative heights of all photons classified as top of canopy within the segment
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: toc_roughness
      • fullnamepath: /gt1r/land_segments/canopy/toc_roughness
    gt1r_land_segments_canopy_h_min_canopy_abs[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: absolute minimum canopy height
      • description: The minimum of absolute individual canopy heights within segment referenced above the WGS84 Ellipsoid.
      • source: Land ATBD section 2.2.9
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_min_canopy_abs
      • fullnamepath: /gt1r/land_segments/canopy/h_min_canopy_abs
    gt1r_land_segments_canopy_h_dif_canopy[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: canopy diff to median height
      • description: Difference between h_canopy and h_median_canopy
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_dif_canopy
      • fullnamepath: /gt1r/land_segments/canopy/h_dif_canopy
    gt1r_land_segments_canopy_h_canopy_quad[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • long_name: canopy quadratic mean
      • description: The quadratic mean height of individual classified relative canopy photon heights above the estimated terrain surface.
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • _FillValue: 3.402823466e+38
      • units: meters
      • origname: h_canopy_quad
      • fullnamepath: /gt1r/land_segments/canopy/h_canopy_quad
    gt1r_land_segments_canopy_n_ca_photons[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int32)
    • attributes
      • units: 1
      • long_name: number canopy photons
      • description: The number of photons classified as canopy within the segment.
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: n_ca_photons
      • fullnamepath: /gt1r/land_segments/canopy/n_ca_photons
    gt1r_land_segments_canopy_centroid_height[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: centroid height
      • description: Optical centroid of all photons classified as either canopy or ground points within the segment. The heights used in this calculation are absolute heights above the reference ellipsoid. This parameter is equivalent to the centroid height produced ICESat GLA14.
      • source: Land ATBD section 2.2.22
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: centroid_height
      • fullnamepath: /gt1r/land_segments/canopy/centroid_height
    gt1r_land_segments_canopy_canopy_h_metrics_abs[ gt1r_land_segments_delta_time= 0 ..217] [ ds_metrics= 0 ..8] (Type is Float32)
    • attributes
      • long_name: canopy absolute height metrics
      • description: Height metrics based on the cumulative distribution of absolute canopy heights above the WGS84 Ellipsoid. The height metrics are calculated at the following percentiles: 25,50,60,70,75,80,85,90,95%.
      • source: Land ATBD section 2.2.3
      • coordinates: ../delta_time ../latitude ../longitude
      • _FillValue: 3.402823466e+38
      • units: meters
      • origname: canopy_h_metrics_abs
      • fullnamepath: /gt1r/land_segments/canopy/canopy_h_metrics_abs
    gt1r_land_segments_canopy_landsat_perc[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • long_name: landsat percentage canopy
      • description: Average percentage value of the valid (value <= 100) Landsat Tree Cover Continuous Fields product for each 100 m segment
      • source: Land ATBD section 2.2.24
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: landsat_perc
      • fullnamepath: /gt1r/land_segments/canopy/landsat_perc
    gt1r_land_segments_canopy_h_mean_canopy[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: mean canopy height
      • description: Mean of individual relative canopy heights within segment. Relative canopy heights have been computed by differencing the canopy photon height from the estimated terrain surface.
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_mean_canopy
      • fullnamepath: /gt1r/land_segments/canopy/h_mean_canopy
    gt1r_land_segments_canopy_canopy_h_metrics[ gt1r_land_segments_delta_time= 0 ..217] [ ds_metrics= 0 ..8] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: canopy height metrics
      • description: Height metrics based on the cumulative distribution of relative canopy heights above the interpolated ground surface. The height metrics are calculated at the following percentiles: 25,50,60,70,75,80,85,90,95%.
      • source: Land ATBD section 2.2.3
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: canopy_h_metrics
      • fullnamepath: /gt1r/land_segments/canopy/canopy_h_metrics
    gt1r_land_segments_canopy_n_toc_photons[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int32)
    • attributes
      • units: 1
      • long_name: number top of canopy photons
      • description: The number of photons classified as top of canopy within the segment.
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: n_toc_photons
      • fullnamepath: /gt1r/land_segments/canopy/n_toc_photons
    gt1r_land_segments_canopy_canopy_flag[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int32)
    • attributes
      • _FillValue: 2147483647
      • units: 1
      • long_name: canopy flag
      • description: Flag indicating that canopy was detected using the Landsat Tree Cover Continuous Fields data product. If percent of canopy cover along the L-km segment is greater than 5%, then canopy is assumed to be present; else, no canopy is assumed present.
      • source: Land ATBD section 2.2.22
      • coordinates: ../delta_time ../latitude ../longitude
      • flag_meanings: no_canopy_present canopy_present
      • flag_values: 0, 1
      • origname: canopy_flag
      • fullnamepath: /gt1r/land_segments/canopy/canopy_flag
    gt1r_land_segments_canopy_landsat_flag[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int32)
    • attributes
      • _FillValue: 2147483647
      • units: 1
      • long_name: landsat flag
      • description: Flag indicating that more than 50% of the Landsat Continuous Cover product have values > 100 for the L-Km segment. Canopy is assumed present along the L-km segment if landsat_flag is 1.
      • source: Land ATBD section 2.2.25
      • coordinates: ../delta_time ../latitude ../longitude
      • flag_meanings: canopy_not_assumed_present canopy_assumed_present
      • flag_values: 0, 1
      • origname: landsat_flag
      • fullnamepath: /gt1r/land_segments/canopy/landsat_flag
    gt1r_land_segments_canopy_h_max_canopy_abs[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: absolute maximum canopy height
      • description: Maximum of individual absolute canopy heights within segment referenced above the WGS84 ellipsoid.
      • source: Land ATBD section 2.2.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_max_canopy_abs
      • fullnamepath: /gt1r/land_segments/canopy/h_max_canopy_abs
    gt1r_land_segments_canopy_h_canopy_uncertainty[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: segment canopy height uncertainty
      • description: Uncertainty of the relative canopy heights for the segment. Incorporates all systematic uncertainties as well as uncertainty from errors of identified photons. See section 1 and equations 1.4 and 1.5 in the Land ATBD
      • source: Land ATBD section 1.5
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_canopy_uncertainty
      • fullnamepath: /gt1r/land_segments/canopy/h_canopy_uncertainty
    gt1r_land_segments_canopy_canopy_openness[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • long_name: canopy openness
      • description: Standard Deviation of all photons classified as canopy photons within the segment to provide inference of canopy openness.
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: canopy_openness
      • fullnamepath: /gt1r/land_segments/canopy/canopy_openness
    gt1r_land_segments_canopy_h_max_canopy[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: maximum canopy height
      • description: Relative maximum of individual canopy heights within segment. Relative canopy heights have been computed by differencing the canopy photon height from the estimated terrain surface. Should be equivalent to RH100 metric reported in the literature.
      • source: Land ATBD section 2.2.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_max_canopy
      • fullnamepath: /gt1r/land_segments/canopy/h_max_canopy
    gt1r_land_segments_sigma_across[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • contentType: referenceInformation
      • long_name: sigma atlas y
      • description: Total cross-track uncertainty due to PPD and POD knowledge. Read from ATL03 product gtx/geolocation/sigma_across. Sigma_atlas_y is reported on ATL08 as the uncertainty of the center-most reference photon of the 100m ATL08 segment.
      • source: ATL03
      • coordinates: delta_time latitude longitude
      • origname: sigma_across
      • fullnamepath: /gt1r/land_segments/sigma_across
    gt1r_land_segments_terrain_h_te_uncertainty[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: uncertainty of h_te_mean
      • description: Uncertainty of the mean terrain height for the segment. This uncertainty incorporates all systematic uncertainties(e.g. timing orbits, geolocation,etc.) as well as uncertainty from errors of identified photons. This parameter is described in section 1, equation 1.4
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_uncertainty
      • fullnamepath: /gt1r/land_segments/terrain/h_te_uncertainty
    gt1r_land_segments_terrain_h_te_mean[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: mean terrain height
      • description: The mean of the photon heights above the WGS84 Ellipsoid, classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_mean
      • fullnamepath: /gt1r/land_segments/terrain/h_te_mean
    gt1r_land_segments_terrain_h_te_min[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: minimum terrain height
      • description: The minimum of the photon heights above the WGS84 Ellipsoid, classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_min
      • fullnamepath: /gt1r/land_segments/terrain/h_te_min
    gt1r_land_segments_terrain_h_te_interp[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: interpolated terrain surface height
      • description: Interpolated terrain surface height above the WGS84 Ellipsoid at the midpoint of the segment.
      • source: Land ATBD section 4.9
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_interp
      • fullnamepath: /gt1r/land_segments/terrain/h_te_interp
    gt1r_land_segments_terrain_h_te_max[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: maximum terrain height
      • description: The maximum of the photon heights above the WGS84 Ellipsoid, classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_max
      • fullnamepath: /gt1r/land_segments/terrain/h_te_max
    gt1r_land_segments_terrain_h_te_skew[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: skew of terrain heights
      • description: The skewness of the photon heights above the WGS84 Ellipsoid, classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_skew
      • fullnamepath: /gt1r/land_segments/terrain/h_te_skew
    gt1r_land_segments_terrain_h_te_median[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: median terrain height
      • description: The median of the photon heights above the WGS84 Ellipsoid, classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_median
      • fullnamepath: /gt1r/land_segments/terrain/h_te_median
    gt1r_land_segments_terrain_h_te_best_fit[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: segment terrain height best fit
      • description: The best fit terrain elevation at the the mid-point location of each 100m segment. The mid-segment terrain elevation is determined by selecting the best of three fits- linear, 3rd order and 4th order polynomials - to the terrain photons and interpolating the elevation at the mid-point location of the 100 m segment. For the linear fit, a slope correction and weighting is applied to each ground photon based on the distance to the slope height at the center of the segment.
      • source: Land ATBD section 2.1.15
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_best_fit
      • fullnamepath: /gt1r/land_segments/terrain/h_te_best_fit
    gt1r_land_segments_terrain_h_te_std[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • long_name: segment terrain roughness
      • description: The standard deviation of the photon heights above the WGS84 Ellipsoid, classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • _FillValue: 3.402823466e+38
      • units: meters
      • origname: h_te_std
      • fullnamepath: /gt1r/land_segments/terrain/h_te_std
    gt1r_land_segments_terrain_terrain_slope[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • long_name: segment terrain slope
      • description: The along-track slope of terrain, within each segment;computed by a linear fit of terrain classified photons. Slope is in units of delta height over delta along track distance.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: terrain_slope
      • fullnamepath: /gt1r/land_segments/terrain/terrain_slope
    gt1r_land_segments_terrain_n_te_photons[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int32)
    • attributes
      • units: 1
      • long_name: number of ground photons
      • description: The number of the photons classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: n_te_photons
      • fullnamepath: /gt1r/land_segments/terrain/n_te_photons
    gt1r_land_segments_terrain_h_te_mode[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: mode of terrain heights
      • description: The mode of the photon heights above the WGS84 Ellipsoid, classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_mode
      • fullnamepath: /gt1r/land_segments/terrain/h_te_mode
    gt1r_land_segments_layer_flag[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int16)
    • attributes
      • contentType: modelResult
      • long_name: consolidated cloud flag
      • 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.
      • source: ATL09
      • coordinates: delta_time latitude longitude
      • flag_meanings: likely_clear likely_cloudy
      • flag_values: 0, 1
      • origname: layer_flag
      • fullnamepath: /gt1r/land_segments/layer_flag
    gt1r_land_segments_segment_snowcover[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int16)
    • attributes
      • _FillValue: 127
      • units: 1
      • long_name: segment snowcover
      • description: Daily snow/ice cover from ATL09 at the 25 Hz rate(275m) indicating likely presence of snow and ice within each segment. 0=ice free water; 1=snow free land; 2=snow; 3=ice.
      • source: ATBD section 4.2.16
      • coordinates: delta_time latitude longitude
      • flag_meanings: ice_free_water snow_free_land snow ice
      • flag_values: 0, 1, 2, 3
      • valid_min: 0
      • valid_max: 3
      • origname: segment_snowcover
      • fullnamepath: /gt1r/land_segments/segment_snowcover
    gt1r_land_segments_beam_azimuth[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: radians
      • contentType: referenceInformation
      • long_name: beam azimuth
      • description: Azimuth(in radians) of the unit pointing vector for the reference photon in the local ENU frame in radians. The angle is measured from north and positive towards East.
      • source: ATL03
      • coordinates: delta_time latitude longitude
      • origname: beam_azimuth
      • fullnamepath: /gt1r/land_segments/beam_azimuth
    gt1r_land_segments_solar_azimuth[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • units: degrees_east
      • contentType: referenceInformation
      • long_name: solar azimuth
      • description: The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot.
      • source: ATL03g ATBD
      • coordinates: delta_time latitude longitude
      • origname: solar_azimuth
      • fullnamepath: /gt1r/land_segments/solar_azimuth
    gt1r_land_segments_psf_flag[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int16)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: point spread function flag
      • description: Flag is set to 1 if the point spread function (computed as sigma_atlas_land) has exceeded the threshold (1 m)
      • source: Land/Veg ATBD
      • coordinates: delta_time latitude longitude
      • flag_meanings: below_threshold above_threshold
      • flag_values: 0, 1
      • valid_min: 0
      • valid_max: 1
      • origname: psf_flag
      • fullnamepath: /gt1r/land_segments/psf_flag
    gt1r_land_segments_longitude[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • units: degrees
      • long_name: longitude
      • standard_name: longitude
      • description: Longitude of the center-most signal photon within each segment.
      • source: Land ATBD section 2.4
      • coordinates: delta_time latitude
      • valid_min: -180.0000000
      • valid_max: 180.0000000
      • origname: longitude
      • fullnamepath: /gt1r/land_segments/longitude
    gt1r_land_segments_latitude[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • units: degrees
      • long_name: latitude
      • standard_name: latitude
      • description: Latitude of the center-most signal photon within each segment.
      • source: Land ATBD section 2.4
      • coordinates: delta_time longitude
      • valid_min: -90.00000000
      • valid_max: 90.00000000
      • origname: latitude
      • fullnamepath: /gt1r/land_segments/latitude
    gt1r_land_segments_segment_id_end[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int32)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: end geolocation segment bin
      • description: Geolocation segment number of the last photon in the land segment.
      • source: ATL03
      • coordinates: delta_time latitude longitude
      • origname: segment_id_end
      • fullnamepath: /gt1r/land_segments/segment_id_end
    gt1r_land_segments_surf_type[ gt1r_land_segments_delta_time= 0 ..217] [ ds_surf_type= 0 ..4] (Type is Int16)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: surface type
      • description: Flags describing which surface types this interval is associated with. 0=not type, 1=is type. Order of array is land, ocean, sea ice, land ice, inland water.
      • source: ATL03 ATBD, Section 4
      • coordinates: delta_time latitude longitude
      • flag_meanings: not_type is_type
      • flag_values: 0, 1
      • valid_min: 0
      • valid_max: 1
      • origname: surf_type
      • fullnamepath: /gt1r/land_segments/surf_type
    gt1r_land_segments_brightness_flag[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int16)
    • attributes
      • _FillValue: 127
      • units: 1
      • long_name: brightness flag
      • description: Flag indicating that the ground surface is bright (e.g. snow-covered or other bright surfaces)
      • source: Land ATBD section 2.4.21
      • coordinates: delta_time latitude longitude
      • flag_meanings: not_bright_surface bright_surface
      • flag_values: 0, 1
      • origname: brightness_flag
      • fullnamepath: /gt1r/land_segments/brightness_flag
    gt1r_land_segments_segment_landcover[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int32)
    • attributes
      • _FillValue: 255
      • units: 1
      • long_name: segment landcover
      • description: IGBP Land Cover Surface type classification as reference from MODIS Land Cover(ANC18) at the 0.5 arcsecond resolution.
      • source: ATBD section 2.4.14
      • coordinates: delta_time latitude longitude
      • flag_meanings: Water Evergreen_Needleleaf_Forest Evergreen_Broadleaf_Forest Deciduous_Needleleaf_Forest Deciduous_Broadleaf_Forest Mixed_Forest Closed_Shrublands Open_Shrubland Woody_Savanna Savanna Grassland Wetland Croplands Urban Crop_Mosaic Permanent_Snow Barren
      • flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
      • valid_min: 0
      • valid_max: 16
      • origname: segment_landcover
      • fullnamepath: /gt1r/land_segments/segment_landcover
    gt1r_land_segments_ph_removal_flag[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int16)
    • attributes
      • units: 1
      • long_name: ph removal flag
      • description: Flag indicating more than ph_removal_percent_limit (default 50.0) removed from land segment due to failing QA tests
      • source: ATBD section 4.13
      • coordinates: delta_time latitude longitude
      • flag_meanings: below_threshold above_threshold
      • flag_values: 0, 1
      • origname: ph_removal_flag
      • fullnamepath: /gt1r/land_segments/ph_removal_flag
    gt1r_land_segments_asr[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • long_name: apparent surface reflectance
      • description: Apparent surface reflectance
      • source: ATL09
      • coordinates: delta_time latitude longitude
      • origname: asr
      • fullnamepath: /gt1r/land_segments/asr
    gt1r_land_segments_sigma_atlas_land[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • contentType: referenceInformation
      • long_name: sigma atlas land
      • description: Total vertical geolocation error due to ranging and local surface slope. The parameter is computed for ATL08 as described in equation 1.2.
      • source: Land ATBD section 2.5.13
      • coordinates: delta_time latitude longitude
      • origname: sigma_atlas_land
      • fullnamepath: /gt1r/land_segments/sigma_atlas_land
    gt1r_land_segments_segment_id_beg[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int32)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: begin geolocation segment bin
      • description: Geolocation segment number of the first photon in the land segment.
      • source: ATL03
      • coordinates: delta_time latitude longitude
      • origname: segment_id_beg
      • fullnamepath: /gt1r/land_segments/segment_id_beg
    gt1r_land_segments_sigma_along[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • contentType: referenceInformation
      • long_name: sigma atlas x
      • description: Total along-track uncertainty due to PPD and POD knowledge. Read from ATL03 product gtx/geolocation/sigma_along. Sigma_atlas_x is reported on ATL08 as the uncertainty of the center-most reference photon of the 100m ATL08 segment.
      • source: ATL03
      • coordinates: delta_time latitude longitude
      • origname: sigma_along
      • fullnamepath: /gt1r/land_segments/sigma_along
    gt1r_land_segments_dem_h[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • contentType: referenceInformation
      • long_name: dem height
      • description: Best available DEM (in priority of Arctic/Antarctic/GMTED/MSS) value at the geolocation point. Height is in meters above the WGS84 Ellipsoid.
      • source: GIMP, GMTED,MSS
      • coordinates: delta_time latitude longitude
      • origname: dem_h
      • fullnamepath: /gt1r/land_segments/dem_h
    gt1r_land_segments_beam_coelev[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: radians
      • contentType: referenceInformation
      • long_name: beam co-elevation
      • description: Co-elevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot.
      • source: ATL03
      • coordinates: delta_time latitude longitude
      • origname: beam_coelev
      • fullnamepath: /gt1r/land_segments/beam_coelev
    gt1r_land_segments_sigma_topo[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • contentType: referenceInformation
      • long_name: sigma atlas topo
      • description: Total uncertainty that include sigma_h plus geolocation uncertainty due to local slope (equation 1.3). The local slope is multiplied by the geolocation uncertainty factor. This will be used to determine the total vertical geolocation error due to ranging and local slope.
      • source: Land ATBD section 2.5.12
      • coordinates: delta_time latitude longitude
      • origname: sigma_topo
      • fullnamepath: /gt1r/land_segments/sigma_topo
    gt1r_land_segments_night_flag[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int32)
    • attributes
      • _FillValue: 2147483647
      • units: 1
      • long_name: night flag
      • description: Flag indicating the data were acquired in night conditions: 0=day, 1=night. Flag is derived from solar elevation at the geolocated segment. IF solar elevation is above threshold it is day, if not then it is night. Threshold is set in atlas_l3a_const_mod.
      • source: Land ATBD section 2.4.8
      • coordinates: delta_time latitude longitude
      • flag_meanings: day night
      • flag_values: 0, 1
      • origname: night_flag
      • fullnamepath: /gt1r/land_segments/night_flag
    gt1r_land_segments_delta_time_beg[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float64)
    • attributes
      • units: seconds since 2018-01-01
      • contentType: referenceInformation
      • long_name: delta time begin
      • description: Time of the first photon contained within the data segment, 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.
      • source: Derived (gps_seconds-gps_sec_offset)
      • coordinates: delta_time latitude longitude
      • origname: delta_time_beg
      • fullnamepath: /gt1r/land_segments/delta_time_beg
    gt1r_land_segments_sigma_h[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • contentType: referenceInformation
      • long_name: height uncertainty
      • description: Estimated uncertainty for the reference photon bounce point ellipsoid height: 1- sigma (m) provided at the geolocation segment rate on ATL03. Sigma_h is reported on ATL08 as the uncertainty of the center-most reference photon of the 100m ATL08 segment.
      • source: ATL03
      • coordinates: delta_time latitude longitude
      • _FillValue: 3.402823466e+38
      • units: 1
      • origname: sigma_h
      • fullnamepath: /gt1r/land_segments/sigma_h
    gt1r_land_segments_last_seg_extend[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • units: kilometers
      • long_name: last segment extended
      • standard_name: last_seg_extend
      • description: The distance (km) that the last ATL08 processing segment in a file is either extended or overlapped with the previous ATL08 processing segment.
      • source: Land ATBD 13March2019, Section 2.4.20
      • coordinates: delta_time latitude longitude
      • origname: last_seg_extend
      • fullnamepath: /gt1r/land_segments/last_seg_extend
    gt1r_land_segments_atlas_pa[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: radians
      • contentType: referenceInformation
      • long_name: atlas pointing angle
      • description: Off nadir pointing angle (in radians) of the satellite to increase spatial sampling in the non-polar regions. ATLAS_PA =90degs-beam_coelev.
      • source: ATL03
      • coordinates: delta_time latitude longitude
      • origname: atlas_pa
      • fullnamepath: /gt1r/land_segments/atlas_pa
    gt1r_land_segments_solar_elevation[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • units: degrees
      • contentType: referenceInformation
      • long_name: solar elevation
      • description: Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low precision value, with approximately TBD degree accuracy.
      • source: ATL03g ATBD
      • coordinates: delta_time latitude longitude
      • origname: solar_elevation
      • fullnamepath: /gt1r/land_segments/solar_elevation
    gt1r_land_segments_cloud_fold_flag[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int16)
    • attributes
      • _FillValue: 127
      • contentType: modelResult
      • long_name: cloud folding flag
      • description: Flag that indicates this profile likely contains cloud signal folded down from above 15 km to the last 2-3 km of the profile. See ATL09 ATBD Table 3.9 for detailed flag value meanings.
      • source: ATL09
      • coordinates: delta_time latitude longitude
      • flag_meanings: no_folding goes5_indicates profile_indicates both_indicate
      • flag_values: 0, 1, 2, 3
      • valid_min: 0
      • valid_max: 3
      • origname: cloud_fold_flag
      • fullnamepath: /gt1r/land_segments/cloud_fold_flag
    gt1r_land_segments_n_seg_ph[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int32)
    • attributes
      • units: 1
      • long_name: number of photons
      • description: Number of photons within each land segment.
      • source: Derived
      • coordinates: delta_time latitude longitude
      • origname: n_seg_ph
      • fullnamepath: /gt1r/land_segments/n_seg_ph
    gt1r_land_segments_terrain_flg[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int32)
    • attributes
      • _FillValue: 2147483647
      • units: 1
      • long_name: terrain flag
      • description: Terrain flag quality check to indicate a deviation above a threshold from the reference DEM height reported on the product.
      • source: Land ATBD section 2.4.8
      • coordinates: delta_time latitude longitude
      • flag_meanings: below_threshold above_threshold
      • flag_values: 0, 1
      • origname: terrain_flg
      • fullnamepath: /gt1r/land_segments/terrain_flg
    gt1r_land_segments_urban_flag[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int32)
    • attributes
      • _FillValue: 2147483647
      • units: 1
      • long_name: segment urban flag
      • description: The urban flag indicates that a segment is likely located over an urban area.
      • source: Land ATBD section 2.4.17
      • coordinates: delta_time latitude longitude
      • flag_meanings: not_urban urban
      • flag_values: 0, 1
      • origname: urban_flag
      • fullnamepath: /gt1r/land_segments/urban_flag
    gt1r_land_segments_dem_removal_flag[ gt1r_land_segments_delta_time= 0 ..217] (Type is Int16)
    • attributes
      • units: 1
      • long_name: dem removal flag
      • description: Flag indicating more than dem_removal_percent_limit (default 20.0) removed from land segment due to failing DEM-QA tests
      • source: ATBD section 2.4.11
      • coordinates: delta_time latitude longitude
      • flag_meanings: below_threshold above_threshold
      • flag_values: 0, 1
      • origname: dem_removal_flag
      • fullnamepath: /gt1r/land_segments/dem_removal_flag
    gt1r_land_segments_h_dif_ref[ gt1r_land_segments_delta_time= 0 ..217] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: h dif from reference
      • description: Difference between h_te_median and ref_DEM
      • source: Land ATBD section 2.4
      • coordinates: delta_time latitude longitude
      • origname: h_dif_ref
      • fullnamepath: /gt1r/land_segments/h_dif_ref
    gt2r_signal_photons_classed_pc_flag[ gt2r_signal_photons_delta_time= 0 ..14712] (Type is Int16)
    • attributes
      • units: 1
      • long_name: photon land atbd classification
      • description: Land Vegetation ATBD classification flag for each photon as either noise, ground, canopy, and top of canopy. 0 = noise, 1 = ground, 2 = canopy, or 3 = top of canopy.
      • source: Land ATBD section 4.10
      • coordinates: delta_time
      • flag_meanings: noise ground canopy top_of_canopy
      • flag_values: 0, 1, 2, 3
      • origname: classed_pc_flag
      • fullnamepath: /gt2r/signal_photons/classed_pc_flag
    gt2r_signal_photons_classed_pc_indx[ gt2r_signal_photons_delta_time= 0 ..14712] (Type is Int32)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: indicies of classed photons
      • description: Index (1-based) of the ATL08 classified signal photon from the start of the ATL03 geolocation segment specified on the ATL08 product at the photon rate in the corresponding parameter, ph_segment_id. This index traces back to specific photon within a 20m segment_id on ATL03. The unique identifier for tracing each ATL08 signal photon to the corresponding photon record on ATL03 is the segment_id, orbit, cycle, and classed_pc_indx. Orbit and cycle intervals for the granule are found in the /ancillary_data. The timestamp of each orbit transition is found in the /orbit_info group.
      • source: Retained from prior a_alt_science_ph packet
      • coordinates: delta_time
      • origname: classed_pc_indx
      • fullnamepath: /gt2r/signal_photons/classed_pc_indx
    gt2r_signal_photons_d_flag[ gt2r_signal_photons_delta_time= 0 ..14712] (Type is Int16)
    • attributes
      • units: 1
      • long_name: dragann flag
      • description: Flag indicating the labeling of DRAGANN noise filtering for a given photon.
      • source: Land ATBD section 2.3.5
      • coordinates: delta_time
      • flag_meanings: noise signal
      • flag_values: 0, 1
      • origname: d_flag
      • fullnamepath: /gt2r/signal_photons/d_flag
    gt2r_signal_photons_ph_segment_id[ gt2r_signal_photons_delta_time= 0 ..14712] (Type is Int32)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: segment id of photon
      • description: Segment ID of photons tracing back to specific 20m segment_id on ATL03. The unique identifier for tracing each ATL08 signal photon to the photon on ATL03 is the segment_id, orbit, and classed_pc_indx. The unique identifier for tracing each ATL08 signal photon to the corresponding photon record on ATL03 is the segment_id, orbit, cycle, and classed_pc_indx. Orbit and cycle intervals for the granule are found in the /ancillary_data. The timestamp of each orbit transition is found in the /orbit_info group.
      • source: Retained from prior a_alt_science_ph packet
      • coordinates: delta_time
      • origname: ph_segment_id
      • fullnamepath: /gt2r/signal_photons/ph_segment_id
    gt2r_land_segments_segment_watermask[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int32)
    • attributes
      • _FillValue: 255
      • units: 1
      • long_name: segment watermask
      • description: Water mask(i.e. flag) indicating inland water as referenced from the Global Raster Water Mask(ANC33) at 250 m spatial resolution.
      • source: ATBD section 2.4.15
      • coordinates: delta_time latitude longitude
      • flag_meanings: no_water water
      • flag_values: 0, 1
      • valid_min: 0
      • valid_max: 1
      • origname: segment_watermask
      • fullnamepath: /gt2r/land_segments/segment_watermask
    gt2r_land_segments_delta_time_end[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float64)
    • attributes
      • units: seconds since 2018-01-01
      • contentType: referenceInformation
      • long_name: delta time end
      • description: Time of the last photon contained within the data segment, in 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.
      • source: Derived (gps_seconds-gps_sec_offset)
      • coordinates: delta_time latitude longitude
      • origname: delta_time_end
      • fullnamepath: /gt2r/land_segments/delta_time_end
    gt2r_land_segments_rgt[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int16)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: reference ground track
      • 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.
      • source: Operations
      • coordinates: delta_time latitude longitude
      • valid_min: 1
      • valid_max: 1387
      • origname: rgt
      • fullnamepath: /gt2r/land_segments/rgt
    gt2r_land_segments_dem_flag[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int16)
    • attributes
      • _FillValue: 127
      • units: 1
      • contentType: referenceInformation
      • long_name: dem source flag
      • description: Indicates source of the DEM height. Values: 0=None, 1=Arctic, 2=GMTED, 3=MSS, 4=Antarctic.
      • source: Atmosphere ATBD
      • coordinates: delta_time latitude longitude
      • flag_meanings: none arctic gmted mss antarctic
      • flag_values: 0, 1, 2, 3, 4
      • valid_min: 0
      • valid_max: 4
      • origname: dem_flag
      • fullnamepath: /gt2r/land_segments/dem_flag
    gt2r_land_segments_msw_flag[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int16)
    • attributes
      • _FillValue: 127
      • units: 1
      • long_name: multiple scattering warning flag
      • 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.
      • source: ATL09
      • coordinates: delta_time latitude longitude
      • 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
      • flag_values: -1, 0, 1, 2, 3, 4, 5
      • origname: msw_flag
      • fullnamepath: /gt2r/land_segments/msw_flag
    gt2r_land_segments_cloud_flag_atm[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int16)
    • attributes
      • _FillValue: 127
      • units: 1
      • long_name: cloud flag atm
      • description: Cloud confidence flag from ATL09 that indicates the number of cloud or aerosol layers identified in each 25Hz atmospheric profile. If the flag is greater than 0, aerosols or clouds could be present. Valid range is 0 - 10.
      • source: ATL09
      • coordinates: delta_time latitude longitude
      • valid_min: 0
      • valid_max: 10
      • origname: cloud_flag_atm
      • fullnamepath: /gt2r/land_segments/cloud_flag_atm
    gt2r_land_segments_snr[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • long_name: signal to noise ratio
      • description: The signal to noise ratio of geolocated photons as determined by the ratio of the superset of ATL03 signal and DRAGANN found signal photons used for processing the ATL08 segments to the background photons (i.e. noise) within the same ATL08 segments.
      • source: ATBD section 2.5.14
      • coordinates: delta_time latitude longitude
      • origname: snr
      • fullnamepath: /gt2r/land_segments/snr
    gt2r_land_segments_canopy_h_canopy[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: height canopy
      • description: 98% height of all the individual canopy relative heights for the segment above the estimated terrain surface. Relative canopy heights have been computed by differencing the canopy photon height from the estimated terrain surface.
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_canopy
      • fullnamepath: /gt2r/land_segments/canopy/h_canopy
    gt2r_land_segments_canopy_canopy_rh_conf[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int16)
    • attributes
      • units: 1
      • contentType: modelResult
      • long_name: canopy relative height confidence
      • description: Canopy relative height confidence flag based on percentage of ground and canopy photons within a segment: 0 (<5% canopy), 1 (>5% canopy, <5% ground), 2 (>5% canopy, >5% ground).
      • source: Land/Veg ATBD 13March2019, Section 2.2.21
      • coordinates: ../delta_time ../latitude ../longitude
      • flag_meanings: <5%_canopy >=5%_canopy_<5%_ground >=5%_canopy_>=5%_ground
      • flag_values: 0, 1, 2
      • valid_min: 0
      • valid_max: 2
      • origname: canopy_rh_conf
      • fullnamepath: /gt2r/land_segments/canopy/canopy_rh_conf
    gt2r_land_segments_canopy_h_median_canopy_abs[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: absolute segment median canopy height
      • description: The median of individual absolute canopy heights within segment referenced above the WGS84 Ellipsoid.
      • source: Land ATBD section 2.2.6
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_median_canopy_abs
      • fullnamepath: /gt2r/land_segments/canopy/h_median_canopy_abs
    gt2r_land_segments_canopy_h_min_canopy[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: minimum canopy height
      • description: The minimum of relative individual canopy heights within segment. Relative canopy heights have been computed by differencing the canopy photon height from the estimated terrain surface.
      • source: Land ATBD section 2.2.10
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_min_canopy
      • fullnamepath: /gt2r/land_segments/canopy/h_min_canopy
    gt2r_land_segments_canopy_h_mean_canopy_abs[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: absolute mean canopy height
      • description: Mean of the individual absolute canopy heights within segment referenced above the WGS84 Ellipsoid.
      • source: Land ATBD section 2.2.4
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_mean_canopy_abs
      • fullnamepath: /gt2r/land_segments/canopy/h_mean_canopy_abs
    gt2r_land_segments_canopy_h_median_canopy[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: median canopy height
      • description: The median of individual relative canopy heights within segment. Relative canopy heights have been computed by differencing the canopy photon height from the estimated terrain surface. This parameter should be equivalent to RH50 reported in the literature.
      • source: Land ATBD section 2.2.8
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_median_canopy
      • fullnamepath: /gt2r/land_segments/canopy/h_median_canopy
    gt2r_land_segments_canopy_h_canopy_abs[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: absolute segment canopy height
      • description: The 98% height of all the absolute individual canopy heights referenced above the WGS84 ellipsoid.
      • source: Land ATBD section 2.2.2
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_canopy_abs
      • fullnamepath: /gt2r/land_segments/canopy/h_canopy_abs
    gt2r_land_segments_canopy_toc_roughness[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: top of canopy roughness
      • description: Standard deviation of the relative heights of all photons classified as top of canopy within the segment
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: toc_roughness
      • fullnamepath: /gt2r/land_segments/canopy/toc_roughness
    gt2r_land_segments_canopy_h_min_canopy_abs[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: absolute minimum canopy height
      • description: The minimum of absolute individual canopy heights within segment referenced above the WGS84 Ellipsoid.
      • source: Land ATBD section 2.2.9
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_min_canopy_abs
      • fullnamepath: /gt2r/land_segments/canopy/h_min_canopy_abs
    gt2r_land_segments_canopy_h_dif_canopy[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: canopy diff to median height
      • description: Difference between h_canopy and h_median_canopy
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_dif_canopy
      • fullnamepath: /gt2r/land_segments/canopy/h_dif_canopy
    gt2r_land_segments_canopy_h_canopy_quad[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • long_name: canopy quadratic mean
      • description: The quadratic mean height of individual classified relative canopy photon heights above the estimated terrain surface.
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • _FillValue: 3.402823466e+38
      • units: meters
      • origname: h_canopy_quad
      • fullnamepath: /gt2r/land_segments/canopy/h_canopy_quad
    gt2r_land_segments_canopy_n_ca_photons[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int32)
    • attributes
      • units: 1
      • long_name: number canopy photons
      • description: The number of photons classified as canopy within the segment.
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: n_ca_photons
      • fullnamepath: /gt2r/land_segments/canopy/n_ca_photons
    gt2r_land_segments_canopy_centroid_height[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: centroid height
      • description: Optical centroid of all photons classified as either canopy or ground points within the segment. The heights used in this calculation are absolute heights above the reference ellipsoid. This parameter is equivalent to the centroid height produced ICESat GLA14.
      • source: Land ATBD section 2.2.22
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: centroid_height
      • fullnamepath: /gt2r/land_segments/canopy/centroid_height
    gt2r_land_segments_canopy_canopy_h_metrics_abs[ gt2r_land_segments_delta_time= 0 ..77] [ ds_metrics= 0 ..8] (Type is Float32)
    • attributes
      • long_name: canopy absolute height metrics
      • description: Height metrics based on the cumulative distribution of absolute canopy heights above the WGS84 Ellipsoid. The height metrics are calculated at the following percentiles: 25,50,60,70,75,80,85,90,95%.
      • source: Land ATBD section 2.2.3
      • coordinates: ../delta_time ../latitude ../longitude
      • _FillValue: 3.402823466e+38
      • units: meters
      • origname: canopy_h_metrics_abs
      • fullnamepath: /gt2r/land_segments/canopy/canopy_h_metrics_abs
    gt2r_land_segments_canopy_landsat_perc[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • long_name: landsat percentage canopy
      • description: Average percentage value of the valid (value <= 100) Landsat Tree Cover Continuous Fields product for each 100 m segment
      • source: Land ATBD section 2.2.24
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: landsat_perc
      • fullnamepath: /gt2r/land_segments/canopy/landsat_perc
    gt2r_land_segments_canopy_h_mean_canopy[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: mean canopy height
      • description: Mean of individual relative canopy heights within segment. Relative canopy heights have been computed by differencing the canopy photon height from the estimated terrain surface.
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_mean_canopy
      • fullnamepath: /gt2r/land_segments/canopy/h_mean_canopy
    gt2r_land_segments_canopy_canopy_h_metrics[ gt2r_land_segments_delta_time= 0 ..77] [ ds_metrics= 0 ..8] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: canopy height metrics
      • description: Height metrics based on the cumulative distribution of relative canopy heights above the interpolated ground surface. The height metrics are calculated at the following percentiles: 25,50,60,70,75,80,85,90,95%.
      • source: Land ATBD section 2.2.3
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: canopy_h_metrics
      • fullnamepath: /gt2r/land_segments/canopy/canopy_h_metrics
    gt2r_land_segments_canopy_n_toc_photons[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int32)
    • attributes
      • units: 1
      • long_name: number top of canopy photons
      • description: The number of photons classified as top of canopy within the segment.
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: n_toc_photons
      • fullnamepath: /gt2r/land_segments/canopy/n_toc_photons
    gt2r_land_segments_canopy_canopy_flag[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int32)
    • attributes
      • _FillValue: 2147483647
      • units: 1
      • long_name: canopy flag
      • description: Flag indicating that canopy was detected using the Landsat Tree Cover Continuous Fields data product. If percent of canopy cover along the L-km segment is greater than 5%, then canopy is assumed to be present; else, no canopy is assumed present.
      • source: Land ATBD section 2.2.22
      • coordinates: ../delta_time ../latitude ../longitude
      • flag_meanings: no_canopy_present canopy_present
      • flag_values: 0, 1
      • origname: canopy_flag
      • fullnamepath: /gt2r/land_segments/canopy/canopy_flag
    gt2r_land_segments_canopy_landsat_flag[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int32)
    • attributes
      • _FillValue: 2147483647
      • units: 1
      • long_name: landsat flag
      • description: Flag indicating that more than 50% of the Landsat Continuous Cover product have values > 100 for the L-Km segment. Canopy is assumed present along the L-km segment if landsat_flag is 1.
      • source: Land ATBD section 2.2.25
      • coordinates: ../delta_time ../latitude ../longitude
      • flag_meanings: canopy_not_assumed_present canopy_assumed_present
      • flag_values: 0, 1
      • origname: landsat_flag
      • fullnamepath: /gt2r/land_segments/canopy/landsat_flag
    gt2r_land_segments_canopy_h_max_canopy_abs[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: absolute maximum canopy height
      • description: Maximum of individual absolute canopy heights within segment referenced above the WGS84 ellipsoid.
      • source: Land ATBD section 2.2.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_max_canopy_abs
      • fullnamepath: /gt2r/land_segments/canopy/h_max_canopy_abs
    gt2r_land_segments_canopy_h_canopy_uncertainty[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: segment canopy height uncertainty
      • description: Uncertainty of the relative canopy heights for the segment. Incorporates all systematic uncertainties as well as uncertainty from errors of identified photons. See section 1 and equations 1.4 and 1.5 in the Land ATBD
      • source: Land ATBD section 1.5
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_canopy_uncertainty
      • fullnamepath: /gt2r/land_segments/canopy/h_canopy_uncertainty
    gt2r_land_segments_canopy_canopy_openness[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • long_name: canopy openness
      • description: Standard Deviation of all photons classified as canopy photons within the segment to provide inference of canopy openness.
      • source: Land ATBD section 4.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: canopy_openness
      • fullnamepath: /gt2r/land_segments/canopy/canopy_openness
    gt2r_land_segments_canopy_h_max_canopy[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: maximum canopy height
      • description: Relative maximum of individual canopy heights within segment. Relative canopy heights have been computed by differencing the canopy photon height from the estimated terrain surface. Should be equivalent to RH100 metric reported in the literature.
      • source: Land ATBD section 2.2.12
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_max_canopy
      • fullnamepath: /gt2r/land_segments/canopy/h_max_canopy
    gt2r_land_segments_sigma_across[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • contentType: referenceInformation
      • long_name: sigma atlas y
      • description: Total cross-track uncertainty due to PPD and POD knowledge. Read from ATL03 product gtx/geolocation/sigma_across. Sigma_atlas_y is reported on ATL08 as the uncertainty of the center-most reference photon of the 100m ATL08 segment.
      • source: ATL03
      • coordinates: delta_time latitude longitude
      • origname: sigma_across
      • fullnamepath: /gt2r/land_segments/sigma_across
    gt2r_land_segments_terrain_h_te_uncertainty[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: uncertainty of h_te_mean
      • description: Uncertainty of the mean terrain height for the segment. This uncertainty incorporates all systematic uncertainties(e.g. timing orbits, geolocation,etc.) as well as uncertainty from errors of identified photons. This parameter is described in section 1, equation 1.4
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_uncertainty
      • fullnamepath: /gt2r/land_segments/terrain/h_te_uncertainty
    gt2r_land_segments_terrain_h_te_mean[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: mean terrain height
      • description: The mean of the photon heights above the WGS84 Ellipsoid, classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_mean
      • fullnamepath: /gt2r/land_segments/terrain/h_te_mean
    gt2r_land_segments_terrain_h_te_min[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: minimum terrain height
      • description: The minimum of the photon heights above the WGS84 Ellipsoid, classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_min
      • fullnamepath: /gt2r/land_segments/terrain/h_te_min
    gt2r_land_segments_terrain_h_te_interp[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: interpolated terrain surface height
      • description: Interpolated terrain surface height above the WGS84 Ellipsoid at the midpoint of the segment.
      • source: Land ATBD section 4.9
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_interp
      • fullnamepath: /gt2r/land_segments/terrain/h_te_interp
    gt2r_land_segments_terrain_h_te_max[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: maximum terrain height
      • description: The maximum of the photon heights above the WGS84 Ellipsoid, classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_max
      • fullnamepath: /gt2r/land_segments/terrain/h_te_max
    gt2r_land_segments_terrain_h_te_skew[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: skew of terrain heights
      • description: The skewness of the photon heights above the WGS84 Ellipsoid, classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_skew
      • fullnamepath: /gt2r/land_segments/terrain/h_te_skew
    gt2r_land_segments_terrain_h_te_median[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: median terrain height
      • description: The median of the photon heights above the WGS84 Ellipsoid, classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_median
      • fullnamepath: /gt2r/land_segments/terrain/h_te_median
    gt2r_land_segments_terrain_h_te_best_fit[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: segment terrain height best fit
      • description: The best fit terrain elevation at the the mid-point location of each 100m segment. The mid-segment terrain elevation is determined by selecting the best of three fits- linear, 3rd order and 4th order polynomials - to the terrain photons and interpolating the elevation at the mid-point location of the 100 m segment. For the linear fit, a slope correction and weighting is applied to each ground photon based on the distance to the slope height at the center of the segment.
      • source: Land ATBD section 2.1.15
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_best_fit
      • fullnamepath: /gt2r/land_segments/terrain/h_te_best_fit
    gt2r_land_segments_terrain_h_te_std[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • long_name: segment terrain roughness
      • description: The standard deviation of the photon heights above the WGS84 Ellipsoid, classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • _FillValue: 3.402823466e+38
      • units: meters
      • origname: h_te_std
      • fullnamepath: /gt2r/land_segments/terrain/h_te_std
    gt2r_land_segments_terrain_terrain_slope[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • long_name: segment terrain slope
      • description: The along-track slope of terrain, within each segment;computed by a linear fit of terrain classified photons. Slope is in units of delta height over delta along track distance.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: terrain_slope
      • fullnamepath: /gt2r/land_segments/terrain/terrain_slope
    gt2r_land_segments_terrain_n_te_photons[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int32)
    • attributes
      • units: 1
      • long_name: number of ground photons
      • description: The number of the photons classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: n_te_photons
      • fullnamepath: /gt2r/land_segments/terrain/n_te_photons
    gt2r_land_segments_terrain_h_te_mode[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: mode of terrain heights
      • description: The mode of the photon heights above the WGS84 Ellipsoid, classified as terrain within the segment.
      • source: Land ATBD section 4.11
      • coordinates: ../delta_time ../latitude ../longitude
      • origname: h_te_mode
      • fullnamepath: /gt2r/land_segments/terrain/h_te_mode
    gt2r_land_segments_layer_flag[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int16)
    • attributes
      • contentType: modelResult
      • long_name: consolidated cloud flag
      • 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.
      • source: ATL09
      • coordinates: delta_time latitude longitude
      • flag_meanings: likely_clear likely_cloudy
      • flag_values: 0, 1
      • origname: layer_flag
      • fullnamepath: /gt2r/land_segments/layer_flag
    gt2r_land_segments_segment_snowcover[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int16)
    • attributes
      • _FillValue: 127
      • units: 1
      • long_name: segment snowcover
      • description: Daily snow/ice cover from ATL09 at the 25 Hz rate(275m) indicating likely presence of snow and ice within each segment. 0=ice free water; 1=snow free land; 2=snow; 3=ice.
      • source: ATBD section 4.2.16
      • coordinates: delta_time latitude longitude
      • flag_meanings: ice_free_water snow_free_land snow ice
      • flag_values: 0, 1, 2, 3
      • valid_min: 0
      • valid_max: 3
      • origname: segment_snowcover
      • fullnamepath: /gt2r/land_segments/segment_snowcover
    gt2r_land_segments_beam_azimuth[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: radians
      • contentType: referenceInformation
      • long_name: beam azimuth
      • description: Azimuth(in radians) of the unit pointing vector for the reference photon in the local ENU frame in radians. The angle is measured from north and positive towards East.
      • source: ATL03
      • coordinates: delta_time latitude longitude
      • origname: beam_azimuth
      • fullnamepath: /gt2r/land_segments/beam_azimuth
    gt2r_land_segments_solar_azimuth[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • units: degrees_east
      • contentType: referenceInformation
      • long_name: solar azimuth
      • description: The direction, eastwards from north, of the sun vector as seen by an observer at the laser ground spot.
      • source: ATL03g ATBD
      • coordinates: delta_time latitude longitude
      • origname: solar_azimuth
      • fullnamepath: /gt2r/land_segments/solar_azimuth
    gt2r_land_segments_psf_flag[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int16)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: point spread function flag
      • description: Flag is set to 1 if the point spread function (computed as sigma_atlas_land) has exceeded the threshold (1 m)
      • source: Land/Veg ATBD
      • coordinates: delta_time latitude longitude
      • flag_meanings: below_threshold above_threshold
      • flag_values: 0, 1
      • valid_min: 0
      • valid_max: 1
      • origname: psf_flag
      • fullnamepath: /gt2r/land_segments/psf_flag
    gt2r_land_segments_longitude[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • units: degrees
      • long_name: longitude
      • standard_name: longitude
      • description: Longitude of the center-most signal photon within each segment.
      • source: Land ATBD section 2.4
      • coordinates: delta_time latitude
      • valid_min: -180.0000000
      • valid_max: 180.0000000
      • origname: longitude
      • fullnamepath: /gt2r/land_segments/longitude
    gt2r_land_segments_latitude[ gt2r_land_segments_delta_time= 0 ..77] (Type is Float32)
    • attributes
      • units: degrees
      • long_name: latitude
      • standard_name: latitude
      • description: Latitude of the center-most signal photon within each segment.
      • source: Land ATBD section 2.4
      • coordinates: delta_time longitude
      • valid_min: -90.00000000
      • valid_max: 90.00000000
      • origname: latitude
      • fullnamepath: /gt2r/land_segments/latitude
    gt2r_land_segments_segment_id_end[ gt2r_land_segments_delta_time= 0 ..77] (Type is Int32)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: end geolocation segment bin
      • description: Geolocation segment number of the last photon in the land segment.
      • source: ATL03
      • coordinates: delta_time latitude longitude
      • origname: segment_id_end
      • fullnamepath: /gt2r/land_segments/segment_id_end
    gt2r_land_segments_surf_type[ gt2r_land_segments_delta_time= 0 ..77] [ ds_surf_type= 0 ..4] (Type is Int16)
    • attributes
      • units: 1