OPeNDAP Data Access Form for ATL03_20181027044307_04360108_002_01.h5
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dataset: ATL03_20181027044307_04360108_002_01.h5




  • HDF5_GLOBAL
    • granule_type: ATL03
    • short_name: ATL03
    • level: L2
    • description: This data set (ATL03) contains height above the WGS 84 ellipsoid (ITRF2014 reference frame), latitude, longitude, and time for all photons downlinked by the Advanced Topographic Laser Altimeter System (ATLAS) instrument on board the Ice, Cloud and land Ele
    • 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/ATL03.001
    • identifier_product_doi_authority: http://dx.doi.org
    • identifier_product_type: ATL03
    • 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: 2019-09-16T08:58:39.000000Z
    • hdfversion: HDF5 1.10.3
    • history: 2019-09-16T08:58:39.000000Z;fcc2d85c-d62f-3fd2-80df-66faf8b5709d;Created by PGE atlas_l2a_alt Version 3.2
    • identifier_file_uuid: fcc2d85c-d62f-3fd2-80df-66faf8b5709d
    • identifier_product_format_version: 3.2
    • time_coverage_duration: 422.00000000000000
    • time_coverage_end: 2018-10-27T04:50:09.000000Z
    • time_coverage_start: 2018-10-27T04:43:07.000000Z
    • geospatial_lat_min: -27.002708957117243
    • geospatial_lon_min: -29.134439056054468
    • geospatial_lat_max: -0.089309352519341773
    • geospatial_lon_max: -26.305204172545441
    • 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 L2A Global Geolocated Photon Data
    • identifier_file_product_type: ATL03
    • institution: National Aeronautics and Space Administration (NASA)
    • creator_name: GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System
    • summary: The purpose of ATL03 is to provide along-track photon data for all 6 ATLAS beams and associated statistics.
    • keywords: EARTH SCIENCE > CRYOSPHERE > SEA ICE > 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: 2A
    • 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 data that are common among all beams for the granule. These parameters are constants for a given granule.
    • data_rate: These parameters are constant for a given granule.
    • 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>ATL03_20181027044307_04360108_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>2019-09-16T08:58:39.000000Z</gco:DateTime> </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 19115-2:2009-02-15</gco:CharacterString> </gmd:metadataStandardVersion> <gmd:identificationInfo> <gmd:MD_DataIdentification> <gmd:citation> <gmd:CI_Citation> <gmd:title> <gmx:FileName>ATL03_20181027044307_04360108_002_01.h5</gmx:FileName> </gmd:title> <gmd:date> <gmd:CI_Date> <gmd:date> <gco:DateTime>2019-09-16T08:58:39.000000Z</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>ATL03</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>ATL03_20181027044307_04360108_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 ATL03 standard data product contains precise latitude, longitude and height above ellipsoid for all received photons. Geophysical corrections are applied to the photon height values and each photon is classified as signal vs. background. Includes segmented data at a 20-meter along-track length. Geophysical corrections, atmosphere corrections and the surface types (land ice, sea ice, ocean, land, inland water) are provided for each 20-meter segment.</gco:CharacterString> </gmd:abstract> <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:aggregationInfo> <gmd:MD_AggregateInformation> <gmd:aggregateDataSetName> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>ATL03</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:topicCategory> <gmd:MD_TopicCategoryCode>geoscientificInformation</gmd:MD_TopicCategoryCode> </gmd:topicCategory> <gmd:extent> <gmd:EX_Extent id=\"boundingExtent\"> <gmd:geographicElement> <gmd:EX_GeographicDescription id=\"Orbit\"> <gmd:geographicIdentifier> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>AscendingCrossing: 165.46642341500024 StartLatitude: 0.0000000000000000 StartDirection:D EndLatitude: -27.000000000000000 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: 637 EquatorCrossingLongitude: 165.46642341500024 EquatorCrossingDateTime: 2018-10-27T03:56:03.645694Z</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>2018-10-27T04:43:09.076784Z</gml:beginPosition> <gml:endPosition>2018-10-27T04:50:10.177894Z</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>2019-09-16T08:58:39.000000Z;fcc2d85c-d62f-3fd2-80df-66faf8b5709d;Created by PGE atlas_l2a_alt Version 3.2</gco:CharacterString> </gmd:description> <gmd:dateTime> <gco:DateTime>2019-09-16T08:58:39.000000Z</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>ATL03.002</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 L2A Global Geolocated Photon Data</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>ATL03</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/ATL03.002\">doi:10.5067/ATLAS/ATL03.002</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 ATL03 standard data product contains precise latitude, longitude and height above ellipsoid for all received photons. Geophysical corrections are applied to the photon height values and each photon is classified as signal vs. background. Includes segmented data at a 20-meter along-track length. Geophysical corrections, atmosphere corrections and the surface types (land ice, sea ice, ocean, land, inland water) are provided for each 20-meter segment.</gco:CharacterString> </gmd:abstract> <gmd:purpose> <gco:CharacterString>The purpose of ATL03 is to provide along-track photon data for all 6 ATLAS beams and associated statistics.</gco:CharacterString> </gmd:purpose> <gmd:credit> <gco:CharacterString>The software that generates the ATL03 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; CRYOSPHERE &gt; SEA ICE &gt; NONE &gt; NONE &gt; NONE &gt; NONE</gco:CharacterString> </gmd:keyword> <gmd:keyword> <gco:CharacterString>EARTH SCIENCE &gt; CRYOSPHERE &gt; GLACIERS/ICE SHEETS &gt; NONE &gt; NONE &gt; NONE &gt; NONE</gco:CharacterString> </gmd:keyword> <gmd:keyword> <gco:CharacterString>EARTH SCIENCE &gt; LAND SURFACE &gt; TOPOGRAPHY &gt; NONE &gt; NONE &gt; NONE &gt; NONE</gco:CharacterString> </gmd:keyword> <gmd:keyword> <gco:CharacterString>EARTH SCIENCE &gt; OCEANS &gt; SEA SURFACE TOPOGRAPHY &gt; NONE &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> <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>2A</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>2A</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/ATL03.002</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: G
      • language: eng
      • publicationDate: 07/2019
      • ShortName: ATL03_SDP
      • title: ICESat-2-SIPS-SPEC-4258 - ATLAS Science Algorithm Standard Data Product (SDP) Volume 3 (ATL03)
      • fullnamepath: /METADATA/ProductSpecificationDocument
    • METADATA_SeriesIdentification
      • maintenanceAndUpdateFrequency: asNeeded
      • maintenanceDate: SET_BY_META
      • VersionID: 002
      • identifier_product_DOI: 10.5067/ATLAS/ATL03.001
      • language: eng
      • characterSet: utf8
      • pointOfContact: NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center
      • longName: ATLAS/ICESat-2 L2A Global Geolocated Photon Data
      • shortName: ATL03
      • revisionDate: 2016-06-09
      • resourceProviderOrganizationName: National Aeronautics and Space Administration (NASA)
      • abstract: The ICESat-2 ATL03 standard data product contains precise latitude, longitude and height above ellipsoid for all received photons. Geophysical corrections are applied to the photon height values and each photon is classified as signal vs. background. Includes segmented data at a 20-meter along-track length. Geophysical corrections, atmosphere corrections and the surface types (land ice, sea ice, ocean, land, inland water) are provided for each 20-meter segment.
      • purpose: The purpose of ATL03 is to provide along-track photon data for all 6 ATLAS beams and associated statistics.
      • credit: The software that generates the ATL03 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: 2019-09-16T08:58:39.000000Z
      • uuid: fcc2d85c-d62f-3fd2-80df-66faf8b5709d
      • fileName: ATL03_20181027044307_04360108_002_01.h5
      • VersionID: 002
      • language: eng
      • characterSet: utf8
      • shortName: ATL03
      • originatorOrganizationName: GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System
      • abstract: The ICESat-2 ATL03 standard data product contains precise latitude, longitude and height above ellipsoid for all received photons. Geophysical corrections are applied to the photon height values and each photon is classified as signal vs. background. Includes segmented data at a 20-meter along-track length. Geophysical corrections, atmosphere corrections and the surface types (land ice, sea ice, ocean, land, inland water) are provided for each 20-meter segment.
      • purpose: The purpose of ATL03 is to provide along-track photon data for all 6 ATLAS beams and associated statistics.
      • credit: The software that generates the ATL03 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: -0.089309352519341773
      • eastBoundLongitude: -26.305204172545441
      • southBoundLatitude: -27.002708957117243
      • westBoundLongitude: -29.134439056054468
      • rangeBeginningDateTime: 2018-10-27T04:43:09.076784Z
      • rangeEndingDateTime: 2018-10-27T04:50:10.177894Z
      • 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: 2019-09-16T09:02:51.000000Z
      • fileName: ATL03_20181027044307_04360108_002_01.qa
      • fullnamepath: /METADATA/QADatasetIdentification
  • METADATA_Lineage:
    • METADATA_Lineage_ANC25_03
      • description: HDF5 template file that defines the organization and default content of the product.
      • fileName: atl03_template.h5
      • shortName: ANC25-03
      • uuid: df6caf89-8e89-3e1e-b2b0-e366efb27b41
      • version: 032
      • fullnamepath: /METADATA/Lineage/ANC25-03
    • METADATA_Lineage_ANC03
      • description: ECI to ECF Quaternions file created by the ICESat-2 POD/PPD facility.
      • fileName: ANC03_f_201830000000_v01.h5
      • shortName: ANC03
      • uuid: 75d0ae78-b5fd-302d-a1f8-02d00c101fc1
      • version: 005
      • fullnamepath: /METADATA/Lineage/ANC03
    • 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_l2a_alt_002002794.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_ANC12_02
      • description: ICESat-2 inland water mask, reformatted into HDF5.
      • fileName: iw_mask_20190603_001_01.h5
      • shortName: ANC12-02
      • uuid: f99b10d9-ecbb-31e9-ad1e-e2dcc927fcd3
      • version: 20190603
      • fullnamepath: /METADATA/Lineage/ANC12-02
    • METADATA_Lineage_ANC41
      • description: Contains transmit pulse information derived from an aggregation of Transmit Echo Pulse (TEP) photons.
      • fileName: ANC41_20181026231311_04330101_002_01.h5
      • shortName: ANC41
      • uuid: d77c3392-0502-374a-bdc5-f0901a379bb1
      • version: 002
      • start_cycle: 1
      • end_cycle: 1
      • start_orbit: 634
      • end_orbit: 649
      • start_rgt: 433
      • end_rgt: 448
      • start_region: 1
      • end_region: 14
      • fullnamepath: /METADATA/Lineage/ANC41
    • METADATA_Lineage_ANC08
      • description: Pole position file, provided by POD/PPD.
      • fileName: master_bih.table_20190915
      • shortName: ANC08
      • uuid: NOT_SET
      • version: 0
      • fullnamepath: /METADATA/Lineage/ANC08
    • 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_ANC22
      • description: Reference groundtrack file created by the ICESat-2 POD/PPD facility.
      • fileName: ANC22_201613900000_v01.h5
      • shortName: ANC22
      • uuid: 4b903e42-ed97-3176-bd96-151ff9ecc6fe
      • version: 001
      • fullnamepath: /METADATA/Lineage/ANC22
    • METADATA_Lineage_ANC11
      • description: GOT 4.8 Ocean Tide coefficients, reformatted into HDF5.
      • fileName: anc_got_20160613_02.h5
      • shortName: ANC11
      • uuid: 747924e0-ca70-3e77-b664-0b2230118885
      • version: 20160613
      • fullnamepath: /METADATA/Lineage/ANC11
    • METADATA_Lineage_ANC04
      • description: Ephemeris file created by the ICESat-2 POD/PPD facility
      • fileName: ANC04_f_201830000000_v01.h5
      • shortName: ANC04
      • uuid: 7ff72d55-4d51-3565-aeda-217ddce8674d
      • version: 005
      • fullnamepath: /METADATA/Lineage/ANC04
    • METADATA_Lineage_ANC38_03
      • description: ISO 19139 XML file containing DataSet-level metadata information.
      • fileName: ATL03.002.dataset.xml
      • shortName: ANC38-03
      • uuid: 730ce11c-c4ce-31f7-9e44-9d3b287e6b18
      • version: 002
      • fullnamepath: /METADATA/Lineage/ANC38-03
    • METADATA_Lineage_ANC01
      • description: GEOS5-FPIT meteorological data files (retrieved from the GSFC DAAC)
      • fileName: GEOS.fpit.asm.inst3_3d_asm_Nv.GEOS5124.20181027_0000.V01.nc4\000, GEOS.fpit.asm.inst3_3d_asm_Nv.GEOS5124.20181027_0300.V01.nc4\000, GEOS.fpit.asm.inst3_3d_asm_Nv.GEOS5124.20181027_0600.V01.nc4\000
      • shortName: ANC01\000, ANC01\000, ANC01\000
      • uuid: 8cf2c8f3-a53e-3dcc-929c-d9c84c141d14\000, 891daf28-0efa-3dcb-af6e-377dfbe5fffc\000, 1a66ca0b-2bad-389f-bd61-d9eadb1b31cf\000
      • version: 001\000, 001\000, 001\000
      • fullnamepath: /METADATA/Lineage/ANC01
    • METADATA_Lineage_ANC29
      • description: Ocean Pole Load Tide coefficients
      • fileName: opoleloadcoefcmcor.h5
      • shortName: ANC29
      • uuid: 73eac247-556f-3810-b698-551bc4f8970f
      • version: 001
      • fullnamepath: /METADATA/Lineage/ANC29
    • METADATA_Lineage_ANC12_01
      • description: ICESat-2 surface mask, reformatted into HDF5.
      • fileName: surfmask_20180608_001_01.h5
      • shortName: ANC12-01
      • uuid: 47683fac-2256-308c-b07e-71fb8b68f85d
      • version: 20180608
      • fullnamepath: /METADATA/Lineage/ANC12-01
    • METADATA_Lineage_ANC05
      • description: LF_PNTG File created by the iCESat-2 POD/PPD facility.
      • fileName: ANC05_f_201830000000_v02_cal05_j2000.a.h5
      • shortName: ANC05
      • uuid: 407bf9b0-663d-323b-b568-29252162b3fa
      • version: 005
      • fullnamepath: /METADATA/Lineage/ANC05
    • 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_ANC36_03
      • description: ISO 19139 XML file containing Series-level metadata information.
      • fileName: ATL03.002.series.xml
      • shortName: ANC36-03
      • uuid: 7cf8ebce-ed34-3331-b3c1-15af447af18c
      • version: 002
      • fullnamepath: /METADATA/Lineage/ANC36-03
    • METADATA_Lineage_ANC07
      • description: EGM2008 geoid file, reformatted into HDF5.
      • fileName: egm2008_20140217_001_01.h5
      • shortName: ANC07
      • uuid: ed3b6888-0974-34bc-be2d-39e9c6fc1172
      • version: 20140217
      • fullnamepath: /METADATA/Lineage/ANC07
    • METADATA_Lineage_ANC26_03
      • description: HDF5 template file that defines the organization and default content of the product metadata.
      • fileName: atl03_metadata_template.h5
      • shortName: ANC26-03
      • uuid: d8aa80ba-381e-32ec-b943-3156473f8394
      • version: 032
      • fullnamepath: /METADATA/Lineage/ANC26-03
    • METADATA_Lineage_ATL02
      • description: ATLAS/ICESat-2 L1B Converted Telemetry Data
      • end_geoseg: SET_BY_PGE
      • start_geoseg: SET_BY_PGE
      • fileName: ATL02_20181027043605_04360107_002_01.h5\000, ATL02_20181027044307_04360108_002_01.h5\000, ATL02_20181027045009_04360109_002_01.h5\000
      • shortName: ATL02\000, ATL02\000, ATL02\000
      • uuid: 8ac7c3bb-8103-360a-8eff-25f1440015d9\000, 5b4f17b5-eb18-3baf-a089-e1135deef3f7\000, 6f7d74f0-a88a-3ec0-923b-dc44db9cc0b8\000
      • version: 002\000, 002\000, 002\000
      • start_cycle: 1, 1, 1
      • end_cycle: 1, 1, 1
      • start_orbit: 637, 637, 637
      • end_orbit: 637, 637, 637
      • start_rgt: 436, 436, 436
      • end_rgt: 436, 436, 436
      • start_region: 7, 8, 9
      • end_region: 7, 8, 9
      • fullnamepath: /METADATA/Lineage/ATL02
    • 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: 7c66d365-278a-31f7-8fe4-9c80e2f012e5
      • version: 001
      • fullnamepath: /METADATA/Lineage/ANC19
    • METADATA_Lineage_ANC23
      • description: Dynamic Atmosphere Correction File retrieved from CNES.
      • fileName: dac_dif_25135_18.nc\000, dac_dif_25136_00.nc\000, dac_dif_25136_06.nc\000
      • shortName: ANC23\000, ANC23\000, ANC23\000
      • uuid: 15ce45a8-e697-3859-bec7-2dee94eebf64\000, 1494d172-5636-3576-9ae2-c4d7c2744363\000, 6b69433a-e997-32dc-86f9-f1d3dd413006\000
      • version: nc\000, nc\000, nc\000
      • fullnamepath: /METADATA/Lineage/ANC23
  • 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_l2a_alt_002002794.ctl
      • stepDateTime: 2019-09-16T09:02:54.000000Z
      • 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_l2a_alt_002002794.ctl
      • stepDateTime: 2019-09-16T09:03:24.000000Z
      • fullnamepath: /METADATA/ProcessStep/Metadata
    • METADATA_ProcessStep_PGE
      • ATBDDate: 03/2019
      • ATBDTitle: ICESat-2-SIPS-SPEC-1602 - SIPs: Level 2A Products L5 Specification Document
      • documentation: ICESat-2-SIPS-SPEC-2326 - ATLAS Science Algorithm Software Design Description (SDD) Volume 7 (atlas_l2a_alt)
      • documentDate: 12/1/17
      • processDescription: The atlas_l2a_alt PGE geolocates individual photon returns, performs signal classification and applies geophysical corrections to individual photon heights.
      • identifier: atlas_l2a_alt
      • softwareVersion: Version 3.2
      • softwareDate: Jul 31 2019
      • softwareTitle: ASAS L2A ALT PGE
      • runTimeParameters: CTL_atlas_l2a_alt_002002794.ctl
      • stepDateTime: 2019-09-16T08:58:39.000000Z
      • 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: atl03_qa_util
      • softwareVersion: Version 3.2
      • softwareDate: Jul 31 2019
      • softwareTitle: ATL03 QA Utility
      • runTimeParameters: CTL_atlas_l2a_alt_002002794.ctl
      • stepDateTime: 2019-09-16T09:02:51.000000Z
      • 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_bckgrd_atlas
      • Description: Contains data related to the 50-shot background count, including telemetry and range windows.
      • fullnamepath: /gt1r/bckgrd_atlas
    • gt1r_geolocation
      • Description: Contains parameters related to geolocation. The rate of all of these parameters is at the rate corresponding to the ICESat-2 Geolocation Along Track Segment interval (nominally 20 m along-track). In the case of no photons within the segment (segment_ph_cnt=0), most parameters are filled with invalid or best-estimate values. Maintaining geolocation segments with no photons allows for the geolocation segment arrays to be directly aligned across the gtx groups.
      • data_rate: Data within this group are stored at the ICESat-2 20m segment rate.
      • fullnamepath: /gt1r/geolocation
    • gt1r_geophys_corr
      • Description: Contains parameters used to correct photon heights for selected geophysical effects. Additional geophysical parameters (dac and tide_ocean) are not applied and provided for informational purposes only. All parameters are posted at the same interval as the ICESat-2 Geolocation Along-Track Segment interval (nominally 20m along-track). In the case of no photons within the segment (../geolocation/segment_ph_cnt=0), most parameters are filled with invalid or best-estimate values. Maintaining geolocation segments with no photons allows for the geolocation segment arrays to be directly aligned across the gtx groups.
      • data_rate: These parameters are stored at the ICESat-2 Geolocation Along Track Segment rate (nominally every 20 m along-track).
      • fullnamepath: /gt1r/geophys_corr
    • gt1r_signal_find_output
      • Description: Parameters output for each time interval for which signal photons were selected, and the confidence flag set, based on the algorithm in Section 5. Histogram parameters are from the histogram that was used to identify signal photons and set the confidence parameter for a given time increment.
      • data_rate: Data are stored at the rate of signal finding time intervals.
      • fullnamepath: /gt1r/signal_find_output
    • gt1r_signal_find_output_ocean
      • Description: Surface-type specific parameters output for each time interval for which signal photons were selected, based on the algorithm in Section 5. Histogram parameters are from the histogram that was used to identify signal photons and set the confidence parameter for a given time increment.
      • fullnamepath: /gt1r/signal_find_output/ocean
    • gt1r_heights
      • Description: Contains arrays of the parameters for each received photon.
      • data_rate: Data are stored at the photon detection rate.
      • fullnamepath: /gt1r/heights
    • 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_bckgrd_atlas
      • Description: Contains data related to the 50-shot background count, including telemetry and range windows.
      • fullnamepath: /gt2r/bckgrd_atlas
    • gt2r_geolocation
      • Description: Contains parameters related to geolocation. The rate of all of these parameters is at the rate corresponding to the ICESat-2 Geolocation Along Track Segment interval (nominally 20 m along-track). In the case of no photons within the segment (segment_ph_cnt=0), most parameters are filled with invalid or best-estimate values. Maintaining geolocation segments with no photons allows for the geolocation segment arrays to be directly aligned across the gtx groups.
      • data_rate: Data within this group are stored at the ICESat-2 20m segment rate.
      • fullnamepath: /gt2r/geolocation
    • gt2r_geophys_corr
      • Description: Contains parameters used to correct photon heights for selected geophysical effects. Additional geophysical parameters (dac and tide_ocean) are not applied and provided for informational purposes only. All parameters are posted at the same interval as the ICESat-2 Geolocation Along-Track Segment interval (nominally 20m along-track). In the case of no photons within the segment (../geolocation/segment_ph_cnt=0), most parameters are filled with invalid or best-estimate values. Maintaining geolocation segments with no photons allows for the geolocation segment arrays to be directly aligned across the gtx groups.
      • data_rate: These parameters are stored at the ICESat-2 Geolocation Along Track Segment rate (nominally every 20 m along-track).
      • fullnamepath: /gt2r/geophys_corr
    • gt2r_signal_find_output
      • Description: Parameters output for each time interval for which signal photons were selected, and the confidence flag set, based on the algorithm in Section 5. Histogram parameters are from the histogram that was used to identify signal photons and set the confidence parameter for a given time increment.
      • data_rate: Data are stored at the rate of signal finding time intervals.
      • fullnamepath: /gt2r/signal_find_output
    • gt2r_signal_find_output_ocean
      • Description: Surface-type specific parameters output for each time interval for which signal photons were selected, based on the algorithm in Section 5. Histogram parameters are from the histogram that was used to identify signal photons and set the confidence parameter for a given time increment.
      • fullnamepath: /gt2r/signal_find_output/ocean
    • gt2r_heights
      • Description: Contains arrays of the parameters for each received photon.
      • data_rate: Data are stored at the photon detection rate.
      • fullnamepath: /gt2r/heights
    • quality_assessment
      • Description: Contains quality assessment data. This may include QA counters, QA along-track data and/or QA summary data.
      • fullnamepath: /quality_assessment
    • quality_assessment_gt1r
      • Description: Each group contains the quality assessment information for one Ground Track.
      • fullnamepath: /quality_assessment/gt1r
    • quality_assessment_gt2r
      • Description: Each group contains the quality assessment information for one Ground Track.
      • fullnamepath: /quality_assessment/gt2r
    • quality_assessment_gt1l
      • Description: Each group contains the quality assessment information for one Ground Track.
      • fullnamepath: /quality_assessment/gt1l
    • quality_assessment_gt3l
      • Description: Each group contains the quality assessment information for one Ground Track.
      • fullnamepath: /quality_assessment/gt3l
    • quality_assessment_gt2l
      • Description: Each group contains the quality assessment information for one Ground Track.
      • fullnamepath: /quality_assessment/gt2l
    • quality_assessment_gt3r
      • Description: Each group contains the quality assessment information for one Ground Track.
      • fullnamepath: /quality_assessment/gt3r
    • atlas_impulse_response
      • Description: Contains parameters to characterize the ATLAS pulse energy and pulse shape, derived from the Start Pulse Detector data. These parameters are at the ICESat-2 geolocation segment rate (~20m along-track)
      • fullnamepath: /atlas_impulse_response
    • atlas_impulse_response_pce1_spot1
      • Description: Contains parameters to characterize the ATLAS impulse response from the TEP photon histograms available for two of the three strong beams.
      • fullnamepath: /atlas_impulse_response/pce1_spot1
    • atlas_impulse_response_pce1_spot1_tep_histogram
      • Description: Subgroup that contains the time of the histogram centers and the normalized histogram counts for each bin.
      • fullnamepath: /atlas_impulse_response/pce1_spot1/tep_histogram
    • atlas_impulse_response_pce2_spot3
      • Description: Contains parameters to characterize the ATLAS impulse response from the TEP photon histograms available for two of the three strong beams.
      • fullnamepath: /atlas_impulse_response/pce2_spot3
    • atlas_impulse_response_pce2_spot3_tep_histogram
      • Description: Subgroup that contains the time of the histogram centers and the normalized histogram counts for each bin.
      • fullnamepath: /atlas_impulse_response/pce2_spot3/tep_histogram
    • 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_calibrations
      • Description: This group contains calibrations derived from the ATLAS CAL products.
      • fullnamepath: /ancillary_data/calibrations
    • ancillary_data_calibrations_dead_time_radiometric_signal_loss
      • Description: CAL34 - Dead-time Radiometric Signal Loss. Contains a table of radiometric corrections versus apparent return strength and width for several dead-time values. Correction is to be multiplied by raw return strength to get corrected return strength
      • fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss
    • ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt1l
      • Description: CAL34 - Dead-time Radiometric Signal Loss. Provides a measure of counting efficiency loss as function of first photon bias for received photoelectron populations via combinations of return signal pulsewidth & mean photoelectrons/spot/shot, channel-to-channel basis.
      • fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt1l
    • ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt2l
      • Description: CAL34 - Dead-time Radiometric Signal Loss. Provides a measure of counting efficiency loss as function of first photon bias for received photoelectron populations via combinations of return signal pulsewidth & mean photoelectrons/spot/shot, channel-to-channel basis.
      • fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt2l
    • ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt1r
      • Description: CAL34 - Dead-time Radiometric Signal Loss. Provides a measure of counting efficiency loss as function of first photon bias for received photoelectron populations via combinations of return signal pulsewidth & mean photoelectrons/spot/shot, channel-to-channel basis.
      • fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt1r
    • ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt2r
      • Description: CAL34 - Dead-time Radiometric Signal Loss. Provides a measure of counting efficiency loss as function of first photon bias for received photoelectron populations via combinations of return signal pulsewidth & mean photoelectrons/spot/shot, channel-to-channel basis.
      • fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt2r
    • ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt3l
      • Description: CAL34 - Dead-time Radiometric Signal Loss. Provides a measure of counting efficiency loss as function of first photon bias for received photoelectron populations via combinations of return signal pulsewidth & mean photoelectrons/spot/shot, channel-to-channel basis.
      • fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt3l
    • ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt3r
      • Description: CAL34 - Dead-time Radiometric Signal Loss. Provides a measure of counting efficiency loss as function of first photon bias for received photoelectron populations via combinations of return signal pulsewidth & mean photoelectrons/spot/shot, channel-to-channel basis.
      • fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt3r
    • ancillary_data_calibrations_dead_time
      • Description: CAL42 - Dead-time. Estimates dead time for each ATLAS receiver channel accompanied by an estimated standard deviation for that measurement. photoelectrons/spot/shot, channel-to-channel basis.
      • fullnamepath: /ancillary_data/calibrations/dead_time
    • ancillary_data_calibrations_dead_time_gt1r
      • Description: CAL42 - Dead-time. Estimates dead time for each ATLAS receiver channel accompanied by an estimated standard deviation for that measurement. photoelectrons/spot/shot, channel-to-channel basis.
      • fullnamepath: /ancillary_data/calibrations/dead_time/gt1r
    • ancillary_data_calibrations_dead_time_gt2r
      • Description: CAL42 - Dead-time. Estimates dead time for each ATLAS receiver channel accompanied by an estimated standard deviation for that measurement. photoelectrons/spot/shot, channel-to-channel basis.
      • fullnamepath: /ancillary_data/calibrations/dead_time/gt2r
    • ancillary_data_calibrations_dead_time_gt1l
      • Description: CAL42 - Dead-time. Estimates dead time for each ATLAS receiver channel accompanied by an estimated standard deviation for that measurement. photoelectrons/spot/shot, channel-to-channel basis.
      • fullnamepath: /ancillary_data/calibrations/dead_time/gt1l
    • ancillary_data_calibrations_dead_time_gt3l
      • Description: CAL42 - Dead-time. Estimates dead time for each ATLAS receiver channel accompanied by an estimated standard deviation for that measurement. photoelectrons/spot/shot, channel-to-channel basis.
      • fullnamepath: /ancillary_data/calibrations/dead_time/gt3l
    • ancillary_data_calibrations_dead_time_gt2l
      • Description: CAL42 - Dead-time. Estimates dead time for each ATLAS receiver channel accompanied by an estimated standard deviation for that measurement. photoelectrons/spot/shot, channel-to-channel basis.
      • fullnamepath: /ancillary_data/calibrations/dead_time/gt2l
    • ancillary_data_calibrations_dead_time_gt3r
      • Description: CAL42 - Dead-time. Estimates dead time for each ATLAS receiver channel accompanied by an estimated standard deviation for that measurement. photoelectrons/spot/shot, channel-to-channel basis.
      • fullnamepath: /ancillary_data/calibrations/dead_time/gt3r
    • ancillary_data_calibrations_first_photon_bias
      • Description: CAL19 -First Photon Bias. Provides a correction for first photon bias.
      • fullnamepath: /ancillary_data/calibrations/first_photon_bias
    • ancillary_data_calibrations_first_photon_bias_gt1l
      • Description: CAL19 -First Photon Bias. Provides a correction for first photon bias.
      • fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt1l
    • ancillary_data_calibrations_first_photon_bias_gt1r
      • Description: CAL19 -First Photon Bias. Provides a correction for first photon bias.
      • fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt1r
    • ancillary_data_calibrations_first_photon_bias_gt2l
      • Description: CAL19 -First Photon Bias. Provides a correction for first photon bias.
      • fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt2l
    • ancillary_data_calibrations_first_photon_bias_gt2r
      • Description: CAL19 -First Photon Bias. Provides a correction for first photon bias.
      • fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt2r
    • ancillary_data_calibrations_first_photon_bias_gt3l
      • Description: CAL19 -First Photon Bias. Provides a correction for first photon bias.
      • fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt3l
    • ancillary_data_calibrations_first_photon_bias_gt3r
      • Description: CAL19 -First Photon Bias. Provides a correction for first photon bias.
      • fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt3r
    • ancillary_data_calibrations_low_link_impulse_response
      • Description: CAL20 - System low link impulse response. Calibrates receiver impulse response, including optical and electrically introduced reflections.
      • fullnamepath: /ancillary_data/calibrations/low_link_impulse_response
    • ancillary_data_calibrations_low_link_impulse_response_gt1r
      • Description: CAL20 - System low link impulse response. Calibrates receiver impulse response, including optical and electrically introduced reflections.
      • fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/gt1r
    • ancillary_data_calibrations_low_link_impulse_response_gt2r
      • Description: CAL20 - System low link impulse response. Calibrates receiver impulse response, including optical and electrically introduced reflections.
      • fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/gt2r
    • ancillary_data_calibrations_low_link_impulse_response_gt1l
      • Description: CAL20 - System low link impulse response. Calibrates receiver impulse response, including optical and electrically introduced reflections.
      • fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/gt1l
    • ancillary_data_calibrations_low_link_impulse_response_gt3l
      • Description: CAL20 - System low link impulse response. Calibrates receiver impulse response, including optical and electrically introduced reflections.
      • fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/gt3l
    • ancillary_data_calibrations_low_link_impulse_response_gt2l
      • Description: CAL20 - System low link impulse response. Calibrates receiver impulse response, including optical and electrically introduced reflections.
      • fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/gt2l
    • ancillary_data_calibrations_low_link_impulse_response_gt3r
      • Description: CAL20 - System low link impulse response. Calibrates receiver impulse response, including optical and electrically introduced reflections.
      • fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/gt3r
    • ancillary_data_atlas_engineering
      • Description: This group contains statistics for ATLAS engineering data.
      • fullnamepath: /ancillary_data/atlas_engineering
    • ancillary_data_atlas_engineering_transmit
      • Description: This group contains transmit parameters.
      • fullnamepath: /ancillary_data/atlas_engineering/transmit
    • ancillary_data_atlas_engineering_receiver
      • Description: This group contains receiver parameters.
      • fullnamepath: /ancillary_data/atlas_engineering/receiver
    • ancillary_data_gt1r
      • Description: Contains ancillary data used by the signal finding routine described in the ICESat-2 Global Geolocated Photons ATBD.
      • fullnamepath: /ancillary_data/gt1r
    • ancillary_data_gt1r_signal_find_input
      • Description: Group contains the setup parameters for the signal finding algorithm.
      • data_rate: Parameters in this group are single-instances valid for the entire file.
      • fullnamepath: /ancillary_data/gt1r/signal_find_input
    • ancillary_data_gt2r
      • Description: Contains ancillary data used by the signal finding routine described in the ICESat-2 Global Geolocated Photons ATBD.
      • fullnamepath: /ancillary_data/gt2r
    • ancillary_data_gt2r_signal_find_input
      • Description: Group contains the setup parameters for the signal finding algorithm.
      • data_rate: Parameters in this group are single-instances valid for the entire file.
      • fullnamepath: /ancillary_data/gt2r/signal_find_input
    • ancillary_data_tep
      • 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/tep
    • ancillary_data_gt3r
      • Description: Contains ancillary data used by the signal finding routine described in the ICESat-2 Global Geolocated Photons ATBD.
      • fullnamepath: /ancillary_data/gt3r
    • ancillary_data_gt3r_signal_find_input
      • Description: Group contains the setup parameters for the signal finding algorithm.
      • data_rate: Parameters in this group are single-instances valid for the entire file.
      • fullnamepath: /ancillary_data/gt3r/signal_find_input
    • 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_bckgrd_atlas
      • Description: Contains data related to the 50-shot background count, including telemetry and range windows.
      • fullnamepath: /gt3r/bckgrd_atlas
    • gt3r_geolocation
      • Description: Contains parameters related to geolocation. The rate of all of these parameters is at the rate corresponding to the ICESat-2 Geolocation Along Track Segment interval (nominally 20 m along-track). In the case of no photons within the segment (segment_ph_cnt=0), most parameters are filled with invalid or best-estimate values. Maintaining geolocation segments with no photons allows for the geolocation segment arrays to be directly aligned across the gtx groups.
      • data_rate: Data within this group are stored at the ICESat-2 20m segment rate.
      • fullnamepath: /gt3r/geolocation
    • gt3r_geophys_corr
      • Description: Contains parameters used to correct photon heights for selected geophysical effects. Additional geophysical parameters (dac and tide_ocean) are not applied and provided for informational purposes only. All parameters are posted at the same interval as the ICESat-2 Geolocation Along-Track Segment interval (nominally 20m along-track). In the case of no photons within the segment (../geolocation/segment_ph_cnt=0), most parameters are filled with invalid or best-estimate values. Maintaining geolocation segments with no photons allows for the geolocation segment arrays to be directly aligned across the gtx groups.
      • data_rate: These parameters are stored at the ICESat-2 Geolocation Along Track Segment rate (nominally every 20 m along-track).
      • fullnamepath: /gt3r/geophys_corr
    • gt3r_signal_find_output
      • Description: Parameters output for each time interval for which signal photons were selected, and the confidence flag set, based on the algorithm in Section 5. Histogram parameters are from the histogram that was used to identify signal photons and set the confidence parameter for a given time increment.
      • data_rate: Data are stored at the rate of signal finding time intervals.
      • fullnamepath: /gt3r/signal_find_output
    • gt3r_signal_find_output_ocean
      • Description: Surface-type specific parameters output for each time interval for which signal photons were selected, based on the algorithm in Section 5. Histogram parameters are from the histogram that was used to identify signal photons and set the confidence parameter for a given time increment.
      • fullnamepath: /gt3r/signal_find_output/ocean
    • gt3r_heights
      • Description: Contains arrays of the parameters for each received photon.
      • data_rate: Data are stored at the photon detection rate.
      • fullnamepath: /gt3r/heights
    • DODS_EXTRA
      • Unlimited_Dimension: atlas_impulse_response_pce1_spot1_tep_histogram_tep_hist_time, atlas_impulse_response_pce1_spot1_tep_histogram_tep_tod, atlas_impulse_response_pce2_spot3_tep_histogram_tep_hist_time, atlas_impulse_response_pce2_spot3_tep_histogram_tep_tod, gt1r_bckgrd_atlas_delta_time, gt1r_geolocation_delta_time, gt1r_geophys_corr_delta_time, gt1r_heights_delta_time, gt1r_signal_find_output_ocean_delta_time, gt2r_bckgrd_atlas_delta_time, gt2r_geolocation_delta_time, gt2r_geophys_corr_delta_time, gt2r_heights_delta_time, gt2r_signal_find_output_ocean_delta_time, gt3r_bckgrd_atlas_delta_time, gt3r_geolocation_delta_time, gt3r_geophys_corr_delta_time, gt3r_heights_delta_time, gt3r_signal_find_output_ocean_delta_time, orbit_info_crossing_time, orbit_info_sc_orient_time, FakeDim2, FakeDim3, FakeDim4


    orbit_info_cycle_number[ orbit_info_crossing_time= 0 ..0] (Type is Int16)
    • attributes
      • units: counts
      • contentType: referenceInformation
      • long_name: Cycle Number
      • description: Tracks the number of 91-day cycles in the mission, beginning with 01. A unique orbit number can be determined by subtracting 1 from the cycle_number, multiplying by 1387 and adding the rgt value.
      • source: POD/PPD
      • 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: counts
      • 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 GT2L and GT2R. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs.
      • source: POD/PPD
      • coordinates: crossing_time
      • valid_min: 1
      • valid_max: 1387
      • origname: rgt
      • fullnamepath: /orbit_info/rgt
    gt1r_bckgrd_atlas_bckgrd_int_height[ gt1r_bckgrd_atlas_delta_time= 0 ..83959] (Type is Float32)
    • attributes
      • units: meters
      • contentType: modelResult
      • long_name: Altimetric range window width
      • description: The height of the altimetric range window. This is the height over which the 50-shot sum is generated. Parameter is ingested at 50-Hz, and values are repeated to form a 200-Hz array.
      • source: ATL03 ATBD Section 7.3
      • coordinates: delta_time
      • origname: bckgrd_int_height
      • fullnamepath: /gt1r/bckgrd_atlas/bckgrd_int_height
    gt1r_bckgrd_atlas_tlm_height_band1[ gt1r_bckgrd_atlas_delta_time= 0 ..83959] (Type is Float32)
    • attributes
      • units: meters
      • description: The height in meters of the telemetry band 1.
      • source: ATL03 ATBD, Section 7.3.2
      • coordinates: delta_time
      • long_name: Height of the telemetry band 1
      • origname: tlm_height_band1
      • fullnamepath: /gt1r/bckgrd_atlas/tlm_height_band1
    gt1r_bckgrd_atlas_bckgrd_rate[ gt1r_bckgrd_atlas_delta_time= 0 ..83959] (Type is Float32)
    • attributes
      • units: counts / second
      • contentType: modelResult
      • long_name: Background count rate based on the ATLAS 50-shot sum
      • description: The background count rate from the 50-shot altimetric histogram after removing the number of likely signal photons based on Section 5.
      • source: ATL03 ATBD Section 7.3
      • coordinates: delta_time
      • origname: bckgrd_rate
      • fullnamepath: /gt1r/bckgrd_atlas/bckgrd_rate
    gt1r_bckgrd_atlas_tlm_top_band1[ gt1r_bckgrd_atlas_delta_time= 0 ..83959] (Type is Float32)
    • attributes
      • units: meters
      • long_name: Ellipsoidal height of the top of the telemetry band 1.
      • description: The ellipsoidal heights with respect to WGS-84 of the top of the telemetry band 1, with all geophysical corrections applied.
      • source: ATL03 ATBD, Section 3.2, 7.3.2
      • coordinates: delta_time
      • origname: tlm_top_band1
      • fullnamepath: /gt1r/bckgrd_atlas/tlm_top_band1
    gt1r_bckgrd_atlas_tlm_top_band2[ gt1r_bckgrd_atlas_delta_time= 0 ..83959] (Type is Float32)
    • attributes
      • units: meters
      • long_name: Ellipsoidal height of the top of the telemetry band 2.
      • description: The ellipsoidal heights with respect to WGS-84 of the top of the telemetry band 2, with all geophysical corrections applied.
      • source: ATL03 ATBD, Section 3.2, 7.3.2
      • coordinates: delta_time
      • origname: tlm_top_band2
      • fullnamepath: /gt1r/bckgrd_atlas/tlm_top_band2
    gt1r_bckgrd_atlas_bckgrd_int_height_reduced[ gt1r_bckgrd_atlas_delta_time= 0 ..83959] (Type is Float32)
    • attributes
      • units: meters
      • contentType: modelResult
      • long_name: Altimetric range window height - reduced
      • description: The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span.
      • source: ATL03 ATBD Section 7.3
      • coordinates: delta_time
      • origname: bckgrd_int_height_reduced
      • fullnamepath: /gt1r/bckgrd_atlas/bckgrd_int_height_reduced
    gt1r_bckgrd_atlas_bckgrd_hist_top[ gt1r_bckgrd_atlas_delta_time= 0 ..83959] (Type is Float32)
    • attributes
      • units: meters
      • contentType: modelResult
      • long_name: Top of the altimetric range window
      • description: The height of the top of the altimetric histogram, in meters above the WGS-84 ellipsoid, with all geophysical corrections applied. Parameter is ingested at 50-Hz, and values are repeated to form a 200-Hz array.
      • source: ATL03 ATBD Section 7.3
      • coordinates: delta_time
      • origname: bckgrd_hist_top
      • fullnamepath: /gt1r/bckgrd_atlas/bckgrd_hist_top
    gt1r_bckgrd_atlas_bckgrd_counts_reduced[ gt1r_bckgrd_atlas_delta_time= 0 ..83959] (Type is Int32)
    • attributes
      • units: counts
      • contentType: modelResult
      • long_name: ATLAS 50-shot background count - reduced
      • description: Number of photon counts in the 50-shot sum after subtracting the number of signal photon events, defined as in ATBD Section 5, in that span.
      • source: ATL03 ATBD Section 7.3
      • coordinates: delta_time
      • origname: bckgrd_counts_reduced
      • fullnamepath: /gt1r/bckgrd_atlas/bckgrd_counts_reduced
    gt1r_bckgrd_atlas_tlm_height_band2[ gt1r_bckgrd_atlas_delta_time= 0 ..83959] (Type is Float32)
    • attributes
      • units: meters
      • long_name: Height of the telemetry band 2
      • description: The height in meters of the telemetry band 2. (if 0, second band is not present).
      • source: ATL03 ATBD, Section 7.3.2
      • coordinates: delta_time
      • origname: tlm_height_band2
      • fullnamepath: /gt1r/bckgrd_atlas/tlm_height_band2
    gt1r_bckgrd_atlas_bckgrd_counts[ gt1r_bckgrd_atlas_delta_time= 0 ..83959] (Type is Int32)
    • attributes
      • units: counts
      • contentType: modelResult
      • long_name: ATLAS 50-shot background count
      • description: Onboard 50 shot background (200 Hz) sum of photon events within the altimetric range window.
      • source: ATL03 ATBD Section 7.3
      • coordinates: delta_time
      • origname: bckgrd_counts
      • fullnamepath: /gt1r/bckgrd_atlas/bckgrd_counts
    gt1r_geolocation_segment_ph_cnt[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Int32)
    • attributes
      • _FillValue: 0
      • units: counts
      • long_name: Number of photons
      • description: Number of photons in a given along-track segment. In the case of no photons within the segment (segment_ph_cnt=0), most other parameters are filled with invalid or best-estimate values. Maintaining geolocation segments with no photons allows for the geolocation segment arrays to be directly aligned across the gtx groups.
      • source: Derived
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: segment_ph_cnt
      • fullnamepath: /gt1r/geolocation/segment_ph_cnt
    gt1r_geolocation_segment_length[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float64)
    • attributes
      • units: meters
      • long_name: along-track segment length
      • description: The along-track length of the along-track segment. Nominally these are 20m, but they vary from 19.8m to 20.2m.
      • source: ATL03 ATBD, Section 3.1
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: segment_length
      • fullnamepath: /gt1r/geolocation/segment_length
    gt1r_geolocation_range_bias_corr[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • long_name: range bias correction
      • description: The range_bias estimated from geolocation analysis.
      • source: ATL03G ATBD, Section 3.6
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • _FillValue: 3.402823466e+38
      • units: meters
      • origname: range_bias_corr
      • fullnamepath: /gt1r/geolocation/range_bias_corr
    gt1r_geolocation_neutat_delay_derivative[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters/meters
      • long_name: (Neutral Atmosphere delay)/dh
      • description: Change in neutral atmospheric delay per height change
      • source: ATL03a ATBD
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: neutat_delay_derivative
      • fullnamepath: /gt1r/geolocation/neutat_delay_derivative
    gt1r_geolocation_reference_photon_lon[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float64)
    • attributes
      • units: degrees_east
      • long_name: Segment Longitude
      • standard_name: longitude
      • description: Longitude of each reference photon. Computed from the ECF Cartesian coordinates of the bounce point. In the case of no photons within the segment (segment_ph_cnt=0), the coordinates are the midpoint of the geolocation segment on the reference ground track.
      • source: ATL03G ATBD, Section 3.4
      • coordinates: delta_time
      • valid_min: -180.00000000000000
      • valid_max: 180.00000000000000
      • origname: reference_photon_lon
      • fullnamepath: /gt1r/geolocation/reference_photon_lon
    gt1r_geolocation_sigma_across[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: across-track geolocation uncertainty
      • description: Estimated Cartesian across-track uncertainity (1-sigma) for the refrerence photon
      • source: ATL03G ATBD
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: sigma_across
      • fullnamepath: /gt1r/geolocation/sigma_across
    gt1r_geolocation_sigma_lon[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: degrees
      • long_name: longitude uncertainty
      • description: Estimated geodetic east Longitude uncertainty (1-sigma), for the reference photon bounce point.
      • source: ATL03G ATBD, Section 3.6
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: sigma_lon
      • fullnamepath: /gt1r/geolocation/sigma_lon
    gt1r_geolocation_ref_azimuth[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: radians
      • long_name: Azimuth
      • standard_name: azimuth
      • description: Azimuth 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: ATL03G ATBD, Section 3.3
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: ref_azimuth
      • fullnamepath: /gt1r/geolocation/ref_azimuth
    gt1r_geolocation_ref_elev[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: radians
      • long_name: elevation
      • standard_name: elevation
      • description: Elevation of the unit pointing vector for the reference photon in the local ENU frame in radians. The angle is measured from East-North plane and positive towards Up
      • source: ATL03G ATBD, Section 3.3
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: ref_elev
      • fullnamepath: /gt1r/geolocation/ref_elev
    gt1r_geolocation_neutat_ht[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Neutral atmosphere ref height
      • description: Reference height of the neutral atmosphere range correction
      • source: ATL03a ATBD
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: neutat_ht
      • fullnamepath: /gt1r/geolocation/neutat_ht
    gt1r_geolocation_solar_azimuth[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: degrees_east
      • long_name: solar azimuth
      • description: The azimuth of the sun position vector from the reference photon bounce point position in the local ENU frame. The angle is measured from North and is positive towards East. ATL03g provides this value in radians; it is converted to degrees for ATL03 output.
      • source: ATL03G ATBD, Section 3.3
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: solar_azimuth
      • fullnamepath: /gt1r/geolocation/solar_azimuth
    gt1r_geolocation_surf_type[ gt1r_geolocation_delta_time= 0 ..149895] [ 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 reference_photon_lat reference_photon_lon
      • flag_meanings: not_type is_type
      • flag_values: 0, 1
      • valid_min: 0
      • valid_max: 1
      • origname: surf_type
      • fullnamepath: /gt1r/geolocation/surf_type
    gt1r_geolocation_sigma_lat[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • long_name: latitude uncertainty
      • description: Estimated geodetic Latitude uncertainty (1-sigma), for the reference photon bounce point.
      • source: ATL03G ATBD, Section 3.6
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: sigma_lat
      • fullnamepath: /gt1r/geolocation/sigma_lat
    gt1r_geolocation_tx_pulse_width_lower[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: seconds
      • long_name: Transmit Pulse Energy Lower Width
      • description: The average distance between the lower threshold crossing times measured by the Start Pulse Detector.
      • source: ATL02 ATBD, Section 7.2
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: tx_pulse_width_lower
      • fullnamepath: /gt1r/geolocation/tx_pulse_width_lower
    gt1r_geolocation_sigma_along[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: along-track geolocation uncertainity
      • description: Estimated cartesian along-track uncertainanty (1-sigma) for the reference photon
      • source: ATL03G ATBD
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: sigma_along
      • fullnamepath: /gt1r/geolocation/sigma_along
    gt1r_geolocation_tx_pulse_skew_est[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: seconds
      • long_name: Transmit Pulse Skew Estimate
      • description: The difference between the averages of the lower and upper threshold crossing times. This is an estimate of the transmit pulse skew.
      • source: ATL02 ATBD, Section 7.2
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: tx_pulse_skew_est
      • fullnamepath: /gt1r/geolocation/tx_pulse_skew_est
    gt1r_geolocation_tx_pulse_energy[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: Joules
      • contentType: physicalMeasurement
      • long_name: Transmit Pulse Energy
      • description: The average transmit pulse energy, measured by the internal laser energy monitor, split into per-beam measurements.
      • source: ATL02 ATBD, Section 7.2
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: tx_pulse_energy
      • fullnamepath: /gt1r/geolocation/tx_pulse_energy
    gt1r_geolocation_tx_pulse_width_upper[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: seconds
      • long_name: Transmit Pulse Energy Upper Width
      • description: The average distance between the upper threshold crossing times measured by the Start Pulse Detector.
      • source: ATL02 ATBD, Section 7.2
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: tx_pulse_width_upper
      • fullnamepath: /gt1r/geolocation/tx_pulse_width_upper
    gt1r_geolocation_sigma_h[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • long_name: height uncertainty
      • description: Estimated height uncertainty (1-sigma) for the reference photon bounce point.
      • source: ATL03G ATBD, Section 3.6
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: sigma_h
      • fullnamepath: /gt1r/geolocation/sigma_h
    gt1r_geolocation_podppd_flag[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Int16)
    • attributes
      • _FillValue: 0
      • units: 1
      • long_name: POD_PPD Flag
      • description: Composite POD/PPD flag that indicates the quality of input geolocation products for the specific ATL03 segment. A non-zero value may indicate that geolocation solutions are degraded. The ATL03 sigma values should indicate the degree of uncertainty associated with the degredation. Possible values are: 0=NOMINAL; 1=LRS; 2=LASERS; 3=GYRO; 4=SST1; 5=SST2; 6=ATT_INTERP; 7=MANEUVER; 8=GPS_DATA_GAP; 9-ST_BLINDING; 10=OTHER. Values 1-6 (PPD) are prioritized over values 7-10 (POD). In the case where both POD and PPD report an error, only the PAD value is indicated.
      • source: ANC04, ANC05
      • coordinates: delta_time
      • flag_meanings: nominal lrs lasers gyro sst1 sst2 att_interp maneuver gps_data_gap st_blinding other
      • flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
      • valid_min: 0
      • valid_max: 10
      • origname: podppd_flag
      • fullnamepath: /gt1r/geolocation/podppd_flag
    gt1r_geolocation_velocity_sc[ gt1r_geolocation_delta_time= 0 ..149895] [ ds_xyz= 0 ..2] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters/second
      • long_name: spacecraft velocity
      • description: Spacecraft velocity components (east component, north component, up component) an observer on the ground would measure. While values are common to all beams, this parameter is naturally produced as part of geolocation.
      • source: ATL03G ATBD
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: velocity_sc
      • fullnamepath: /gt1r/geolocation/velocity_sc
    gt1r_geolocation_segment_id[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Int32)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: along-track segment ID number.
      • description: A 7 digit number identifiying the along-track geolocation segment number. These are sequential, starting with 1 for the first segment after an ascending equatorial crossing node.
      • source: ATL03 ATBD, Section 3.1
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: segment_id
      • fullnamepath: /gt1r/geolocation/segment_id
    gt1r_geolocation_reference_photon_lat[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float64)
    • attributes
      • units: degrees_north
      • long_name: Segment Latitude
      • standard_name: latitude
      • description: Latitude of each reference photon. Computed from the ECF Cartesian coordinates of the bounce point. In the case of no photons within the segment (segment_ph_cnt=0), the coordinates are the midpoint of the geolocation segment on the reference ground track.
      • source: ATL03G ATBD, Section 3.4
      • coordinates: delta_time
      • valid_min: -90.000000000000000
      • valid_max: 90.000000000000000
      • origname: reference_photon_lat
      • fullnamepath: /gt1r/geolocation/reference_photon_lat
    gt1r_geolocation_solar_elevation[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: degrees
      • long_name: solar elevation
      • description: The elevation of the sun position vector from the reference photon bounce point position in the local ENU frame. The angle is measured from the East-North plane and is positive Up. ATL03g provides this value in radians; it is converted to degress for ATL03 output.
      • source: ATL03G ATBD, Section 3.3
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: solar_elevation
      • fullnamepath: /gt1r/geolocation/solar_elevation
    gt1r_geolocation_bounce_time_offset[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: seconds
      • long_name: ground bounce time offset
      • description: The difference between the transmit time and the ground bounce time of the reference photons.
      • source: ATL03 ATBD, Section 3.3
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: bounce_time_offset
      • fullnamepath: /gt1r/geolocation/bounce_time_offset
    gt1r_geolocation_reference_photon_index[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Int32)
    • attributes
      • _FillValue: 0
      • units: counts
      • long_name: Reference Photon Index
      • description: Index of the reference photon within the set of photons grouped within in segment. To recover the position of the reference photon within the photon-rate arrays, add ref_ph_ndx to the corresponding ph_ndx_beg and subtract 1. If no reference photon was selected, this value will indicate that the reference photon defaulted to the first photon. In the case of no photons within the segment (segment_ph_cnt=0), the value should be 0.
      • source: ATL03 ATBD, Section 3.2
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: reference_photon_index
      • fullnamepath: /gt1r/geolocation/reference_photon_index
    gt1r_geolocation_altitude_sc[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float64)
    • attributes
      • _FillValue: 1.7976931348623157e+308
      • units: meters
      • long_name: Altitude
      • description: Height of the spacecraft above the WGS84 ellipsoid.
      • source: ATL03g ATBD, Section 3.4
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: altitude_sc
      • fullnamepath: /gt1r/geolocation/altitude_sc
    gt1r_geolocation_segment_dist_x[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float64)
    • attributes
      • units: meters
      • long_name: Segment Distance from EQC
      • description: Along-track distance from the equator crossing to the start of the 20 meter geolocation segment.
      • source: Derived
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: segment_dist_x
      • fullnamepath: /gt1r/geolocation/segment_dist_x
    gt1r_geolocation_neutat_delay_total[ gt1r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Total Neutral Atmospheric Delay
      • description: Total neutral atmosphere delay correction (wet+dry).
      • source: ATL03a ATBD
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: neutat_delay_total
      • fullnamepath: /gt1r/geolocation/neutat_delay_total
    gt1r_geophys_corr_tide_oc_pole[ gt1r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Ocean Pole Tide
      • description: Surface deformation of the Earth due to loading from the centrifugal effect of polar motion upon the oceans (-2 to 2 mm).
      • source: ATL03 ATBD, Section 6.3.6
      • coordinates: delta_time
      • origname: tide_oc_pole
      • fullnamepath: /gt1r/geophys_corr/tide_oc_pole
    gt1r_geophys_corr_dem_flag[ gt1r_geophys_corr_delta_time= 0 ..149895] (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: ATL03 ATBD Section 6.3
      • coordinates: delta_time
      • 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/geophys_corr/dem_flag
    gt1r_geophys_corr_tide_ocean[ gt1r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • long_name: Ocean Tide
      • _FillValue: 3.402823466e+38
      • units: meters
      • description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium). This correction is not applied to the photon heights and provided only as supplemental information.
      • source: ATL03 ATBD, Section 6.3.1
      • coordinates: delta_time
      • origname: tide_ocean
      • fullnamepath: /gt1r/geophys_corr/tide_ocean
    gt1r_geophys_corr_tide_earth[ gt1r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Earth Tide
      • description: Solid Earth Tides
      • source: ATL03 ATBD, Section 6.3.3
      • coordinates: delta_time
      • origname: tide_earth
      • fullnamepath: /gt1r/geophys_corr/tide_earth
    gt1r_geophys_corr_dac[ gt1r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Dynamic Atmosphere Correction
      • description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. This correction is not applied to the photon heights and provided only as supplemental information.
      • source: ATL03 ATBD, Section 6.3.2
      • coordinates: delta_time
      • origname: dac
      • fullnamepath: /gt1r/geophys_corr/dac
    gt1r_geophys_corr_tide_load[ gt1r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Load Tide
      • description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm).
      • source: ATL03 ATBD, Section 6.3.4
      • coordinates: delta_time
      • origname: tide_load
      • fullnamepath: /gt1r/geophys_corr/tide_load
    gt1r_geophys_corr_dem_h[ gt1r_geophys_corr_delta_time= 0 ..149895] (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 location of the reference photon.
      • source: ATL03 ATBD Section 6.3
      • coordinates: delta_time
      • origname: dem_h
      • fullnamepath: /gt1r/geophys_corr/dem_h
    gt1r_geophys_corr_tide_equilibrium[ gt1r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • contentType: referenceInformation
      • long_name: Long Period Equilibrium Tide
      • description: Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). This correction is not applied to the photon heights and is provided only as a supplemental information.
      • source: ATL03 ATBD, Section 6.3.1
      • coordinates: delta_time
      • origname: tide_equilibrium
      • fullnamepath: /gt1r/geophys_corr/tide_equilibrium
    gt1r_geophys_corr_geoid[ gt1r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Geoid
      • description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m). Not applied on the product; requested by higher-level products.
      • source: ATL03 ATBD, Section 6.3.8
      • coordinates: delta_time
      • origname: geoid
      • fullnamepath: /gt1r/geophys_corr/geoid
    gt1r_geophys_corr_tide_pole[ gt1r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Solid Earth Pole Tide
      • description: Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm).
      • source: ATL03 ATBD, Section 6.3.5
      • coordinates: delta_time
      • origname: tide_pole
      • fullnamepath: /gt1r/geophys_corr/tide_pole
    gt1r_signal_find_output_ocean_bckgrd_mean[ gt1r_signal_find_output_ocean_delta_time= 0 ..72818] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: counts
      • long_name: background counts per bin
      • description: The mean of the number of background counts expected in one height bin of the histogram of width dzATM over time period, dtATM
      • source: ATL03 ATBD, Section 5
      • coordinates: delta_time
      • origname: bckgrd_mean
      • fullnamepath: /gt1r/signal_find_output/ocean/bckgrd_mean
    gt1r_signal_find_output_ocean_bckgrd_sigma[ gt1r_signal_find_output_ocean_delta_time= 0 ..72818] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: counts
      • long_name: background counts per bin sigma
      • description: The standard deviation of the number of background counts expected in one height bin of the histogram of width dzATM over time period, dtATM
      • source: ATL03 ATBD, Section 5
      • coordinates: delta_time
      • origname: bckgrd_sigma
      • fullnamepath: /gt1r/signal_find_output/ocean/bckgrd_sigma
    gt1r_signal_find_output_ocean_t_pc_delta[ gt1r_signal_find_output_ocean_delta_time= 0 ..72818] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: seconds
      • long_name: bin width size
      • description: The histogram bin width (integration time) along-track used to find signal photons.
      • source: ATL03 ATBD, Section 5
      • coordinates: delta_time
      • origname: t_pc_delta
      • fullnamepath: /gt1r/signal_find_output/ocean/t_pc_delta
    gt1r_signal_find_output_ocean_z_pc_delta[ gt1r_signal_find_output_ocean_delta_time= 0 ..72818] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: bin height size
      • description: Height bin size of the histogram used to find signal photons.
      • source: ATL03 ATBD, Section 5
      • coordinates: delta_time
      • origname: z_pc_delta
      • fullnamepath: /gt1r/signal_find_output/ocean/z_pc_delta
    gt1r_heights_ph_id_count[ gt1r_heights_delta_time= 0 ..1.319586E6] (Type is Int16)
    • attributes
      • units: counts
      • long_name: photon event counter
      • description: The photon event counter is part of photon ID and counts from 1 for each channel until reset by laser pulse counter.
      • source: Derived as part of Photon ID
      • coordinates: delta_time lat_ph lon_ph
      • contentType: referenceInformation
      • origname: ph_id_count
      • fullnamepath: /gt1r/heights/ph_id_count
    gt1r_heights_lat_ph[ gt1r_heights_delta_time= 0 ..1.319586E6] (Type is Float64)
    • attributes
      • units: degrees_north
      • long_name: Latitude
      • standard_name: latitude
      • description: Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point.
      • source: ATL03g ATBD, Section 3.4
      • coordinates: delta_time lon_ph
      • valid_min: -90.000000000000000
      • valid_max: 90.000000000000000
      • origname: lat_ph
      • fullnamepath: /gt1r/heights/lat_ph
    gt1r_heights_dist_ph_along[ gt1r_heights_delta_time= 0 ..1.319586E6] (Type is Float32)
    • attributes
      • units: meters
      • long_name: Distance from equator crossing.
      • description: Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack.
      • source: ATL03 ATBD, Section 3.1
      • coordinates: delta_time lat_ph lon_ph
      • origname: dist_ph_along
      • fullnamepath: /gt1r/heights/dist_ph_along
    gt1r_heights_signal_conf_ph[ gt1r_heights_delta_time= 0 ..1.319586E6] [ ds_surf_type= 0 ..4] (Type is Int16)
    • attributes
      • units: 1
      • contentType: qualityInformation
      • long_name: Photon Signal Confidence
      • description: Confidence level associated with each photon event selected as signal. 0=noise. 1=added to allow for buffer but algorithm classifies as background; 2=low; 3=med; 4=high). This parameter is a 5xN array where N is the number of photons in the granule, and the 5 rows indicate signal finding for each surface type (in order: land, ocean, sea ice, land ice and inland water). Events not associated with a specific surface type have a confidence level of -1. Events evaluated as TEP returns have a confidence level of -2.
      • source: ATL03 ATBD, Section 5, Conf
      • coordinates: delta_time lat_ph lon_ph
      • flag_meanings: possible_tep not_considered noise buffer low medium high
      • flag_values: -2, -1, 0, 1, 2, 3, 4
      • valid_min: -2
      • valid_max: 4
      • origname: signal_conf_ph
      • fullnamepath: /gt1r/heights/signal_conf_ph
    gt1r_heights_ph_id_pulse[ gt1r_heights_delta_time= 0 ..1.319586E6] (Type is Byte)
    • attributes
      • units: counts
      • contentType: referenceInformation
      • long_name: laser pulse counter
      • description: The laser pulse counter is part of photon ID and counts from 1 to 200 and is reset for each new major frame.
      • source: Derived as part of Photon ID
      • coordinates: delta_time lat_ph lon_ph
      • origname: ph_id_pulse
      • fullnamepath: /gt1r/heights/ph_id_pulse
    gt1r_heights_h_ph[ gt1r_heights_delta_time= 0 ..1.319586E6] (Type is Float32)
    • attributes
      • units: meters
      • contentType: physicalMeasurement
      • long_name: Photon WGS84 Height
      • standard_name: height
      • description: Height of each received photon, relative to the WGS-84 ellipsoid including the geophysical corrections noted in Section 6. Please note that neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights.
      • source: ATL03g ATBD, Section 3.4
      • coordinates: delta_time lat_ph lon_ph
      • origname: h_ph
      • fullnamepath: /gt1r/heights/h_ph
    gt1r_heights_ph_id_channel[ gt1r_heights_delta_time= 0 ..1.319586E6] (Type is Byte)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: Receive channel id
      • description: Channel number assigned for each received photon event. This is part of the photon ID. Values range from 1 to 120 to span all channels and rise/fall edges. Values 1 to 60 are for falling edge; PCE1 (1 to 20), PCE 2 (21 to 40) and PCE3 (41 to 60). Values 61 to 120 are for rising edge; PCE1 (61 to 80), PCE 2 (81 to 100) and PC3 (101 to 120).
      • source: Derived as part of Photon ID
      • coordinates: delta_time lat_ph lon_ph
      • valid_min: 1
      • valid_max: 120
      • origname: ph_id_channel
      • fullnamepath: /gt1r/heights/ph_id_channel
    gt1r_heights_lon_ph[ gt1r_heights_delta_time= 0 ..1.319586E6] (Type is Float64)
    • attributes
      • units: degrees_east
      • long_name: Longitude
      • standard_name: longitude
      • description: Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point.
      • source: ATL03g ATBD, Section 3.4
      • coordinates: delta_time lat_ph
      • valid_min: -180.00000000000000
      • valid_max: 180.00000000000000
      • origname: lon_ph
      • fullnamepath: /gt1r/heights/lon_ph
    gt1r_heights_pce_mframe_cnt[ gt1r_heights_delta_time= 0 ..1.319586E6] (Type is UInt32)
    • attributes
      • units: counts
      • contentType: referenceInformation
      • long_name: PCE Major frame counter
      • description: The major frame counter is read from the digital flow controller in a given PCE card. The counter identifies individual major frames across diag and science packets. Used as part of the photon ID.
      • source: Retained from prior a_alt_science_ph packet
      • coordinates: delta_time lat_ph lon_ph
      • origname: pce_mframe_cnt
      • fullnamepath: /gt1r/heights/pce_mframe_cnt
    gt1r_heights_dist_ph_across[ gt1r_heights_delta_time= 0 ..1.319586E6] (Type is Float32)
    • attributes
      • units: meters
      • long_name: Distance off RGT.
      • description: Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1.
      • source: ATL03 ATBD, Section 3.1
      • coordinates: delta_time lat_ph lon_ph
      • origname: dist_ph_across
      • fullnamepath: /gt1r/heights/dist_ph_across
    gt2r_bckgrd_atlas_bckgrd_int_height[ gt2r_bckgrd_atlas_delta_time= 0 ..84047] (Type is Float32)
    • attributes
      • units: meters
      • contentType: modelResult
      • long_name: Altimetric range window width
      • description: The height of the altimetric range window. This is the height over which the 50-shot sum is generated. Parameter is ingested at 50-Hz, and values are repeated to form a 200-Hz array.
      • source: ATL03 ATBD Section 7.3
      • coordinates: delta_time
      • origname: bckgrd_int_height
      • fullnamepath: /gt2r/bckgrd_atlas/bckgrd_int_height
    gt2r_bckgrd_atlas_tlm_height_band1[ gt2r_bckgrd_atlas_delta_time= 0 ..84047] (Type is Float32)
    • attributes
      • units: meters
      • description: The height in meters of the telemetry band 1.
      • source: ATL03 ATBD, Section 7.3.2
      • coordinates: delta_time
      • long_name: Height of the telemetry band 1
      • origname: tlm_height_band1
      • fullnamepath: /gt2r/bckgrd_atlas/tlm_height_band1
    gt2r_bckgrd_atlas_bckgrd_rate[ gt2r_bckgrd_atlas_delta_time= 0 ..84047] (Type is Float32)
    • attributes
      • units: counts / second
      • contentType: modelResult
      • long_name: Background count rate based on the ATLAS 50-shot sum
      • description: The background count rate from the 50-shot altimetric histogram after removing the number of likely signal photons based on Section 5.
      • source: ATL03 ATBD Section 7.3
      • coordinates: delta_time
      • origname: bckgrd_rate
      • fullnamepath: /gt2r/bckgrd_atlas/bckgrd_rate
    gt2r_bckgrd_atlas_tlm_top_band1[ gt2r_bckgrd_atlas_delta_time= 0 ..84047] (Type is Float32)
    • attributes
      • units: meters
      • long_name: Ellipsoidal height of the top of the telemetry band 1.
      • description: The ellipsoidal heights with respect to WGS-84 of the top of the telemetry band 1, with all geophysical corrections applied.
      • source: ATL03 ATBD, Section 3.2, 7.3.2
      • coordinates: delta_time
      • origname: tlm_top_band1
      • fullnamepath: /gt2r/bckgrd_atlas/tlm_top_band1
    gt2r_bckgrd_atlas_tlm_top_band2[ gt2r_bckgrd_atlas_delta_time= 0 ..84047] (Type is Float32)
    • attributes
      • units: meters
      • long_name: Ellipsoidal height of the top of the telemetry band 2.
      • description: The ellipsoidal heights with respect to WGS-84 of the top of the telemetry band 2, with all geophysical corrections applied.
      • source: ATL03 ATBD, Section 3.2, 7.3.2
      • coordinates: delta_time
      • origname: tlm_top_band2
      • fullnamepath: /gt2r/bckgrd_atlas/tlm_top_band2
    gt2r_bckgrd_atlas_bckgrd_int_height_reduced[ gt2r_bckgrd_atlas_delta_time= 0 ..84047] (Type is Float32)
    • attributes
      • units: meters
      • contentType: modelResult
      • long_name: Altimetric range window height - reduced
      • description: The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span.
      • source: ATL03 ATBD Section 7.3
      • coordinates: delta_time
      • origname: bckgrd_int_height_reduced
      • fullnamepath: /gt2r/bckgrd_atlas/bckgrd_int_height_reduced
    gt2r_bckgrd_atlas_bckgrd_hist_top[ gt2r_bckgrd_atlas_delta_time= 0 ..84047] (Type is Float32)
    • attributes
      • units: meters
      • contentType: modelResult
      • long_name: Top of the altimetric range window
      • description: The height of the top of the altimetric histogram, in meters above the WGS-84 ellipsoid, with all geophysical corrections applied. Parameter is ingested at 50-Hz, and values are repeated to form a 200-Hz array.
      • source: ATL03 ATBD Section 7.3
      • coordinates: delta_time
      • origname: bckgrd_hist_top
      • fullnamepath: /gt2r/bckgrd_atlas/bckgrd_hist_top
    gt2r_bckgrd_atlas_bckgrd_counts_reduced[ gt2r_bckgrd_atlas_delta_time= 0 ..84047] (Type is Int32)
    • attributes
      • units: counts
      • contentType: modelResult
      • long_name: ATLAS 50-shot background count - reduced
      • description: Number of photon counts in the 50-shot sum after subtracting the number of signal photon events, defined as in ATBD Section 5, in that span.
      • source: ATL03 ATBD Section 7.3
      • coordinates: delta_time
      • origname: bckgrd_counts_reduced
      • fullnamepath: /gt2r/bckgrd_atlas/bckgrd_counts_reduced
    gt2r_bckgrd_atlas_tlm_height_band2[ gt2r_bckgrd_atlas_delta_time= 0 ..84047] (Type is Float32)
    • attributes
      • units: meters
      • long_name: Height of the telemetry band 2
      • description: The height in meters of the telemetry band 2. (if 0, second band is not present).
      • source: ATL03 ATBD, Section 7.3.2
      • coordinates: delta_time
      • origname: tlm_height_band2
      • fullnamepath: /gt2r/bckgrd_atlas/tlm_height_band2
    gt2r_bckgrd_atlas_bckgrd_counts[ gt2r_bckgrd_atlas_delta_time= 0 ..84047] (Type is Int32)
    • attributes
      • units: counts
      • contentType: modelResult
      • long_name: ATLAS 50-shot background count
      • description: Onboard 50 shot background (200 Hz) sum of photon events within the altimetric range window.
      • source: ATL03 ATBD Section 7.3
      • coordinates: delta_time
      • origname: bckgrd_counts
      • fullnamepath: /gt2r/bckgrd_atlas/bckgrd_counts
    gt2r_geolocation_segment_ph_cnt[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Int32)
    • attributes
      • _FillValue: 0
      • units: counts
      • long_name: Number of photons
      • description: Number of photons in a given along-track segment. In the case of no photons within the segment (segment_ph_cnt=0), most other parameters are filled with invalid or best-estimate values. Maintaining geolocation segments with no photons allows for the geolocation segment arrays to be directly aligned across the gtx groups.
      • source: Derived
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: segment_ph_cnt
      • fullnamepath: /gt2r/geolocation/segment_ph_cnt
    gt2r_geolocation_segment_length[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float64)
    • attributes
      • units: meters
      • long_name: along-track segment length
      • description: The along-track length of the along-track segment. Nominally these are 20m, but they vary from 19.8m to 20.2m.
      • source: ATL03 ATBD, Section 3.1
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: segment_length
      • fullnamepath: /gt2r/geolocation/segment_length
    gt2r_geolocation_range_bias_corr[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • long_name: range bias correction
      • description: The range_bias estimated from geolocation analysis.
      • source: ATL03G ATBD, Section 3.6
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • _FillValue: 3.402823466e+38
      • units: meters
      • origname: range_bias_corr
      • fullnamepath: /gt2r/geolocation/range_bias_corr
    gt2r_geolocation_neutat_delay_derivative[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters/meters
      • long_name: (Neutral Atmosphere delay)/dh
      • description: Change in neutral atmospheric delay per height change
      • source: ATL03a ATBD
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: neutat_delay_derivative
      • fullnamepath: /gt2r/geolocation/neutat_delay_derivative
    gt2r_geolocation_reference_photon_lon[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float64)
    • attributes
      • units: degrees_east
      • long_name: Segment Longitude
      • standard_name: longitude
      • description: Longitude of each reference photon. Computed from the ECF Cartesian coordinates of the bounce point. In the case of no photons within the segment (segment_ph_cnt=0), the coordinates are the midpoint of the geolocation segment on the reference ground track.
      • source: ATL03G ATBD, Section 3.4
      • coordinates: delta_time
      • valid_min: -180.00000000000000
      • valid_max: 180.00000000000000
      • origname: reference_photon_lon
      • fullnamepath: /gt2r/geolocation/reference_photon_lon
    gt2r_geolocation_sigma_across[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: across-track geolocation uncertainty
      • description: Estimated Cartesian across-track uncertainity (1-sigma) for the refrerence photon
      • source: ATL03G ATBD
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: sigma_across
      • fullnamepath: /gt2r/geolocation/sigma_across
    gt2r_geolocation_sigma_lon[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: degrees
      • long_name: longitude uncertainty
      • description: Estimated geodetic east Longitude uncertainty (1-sigma), for the reference photon bounce point.
      • source: ATL03G ATBD, Section 3.6
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: sigma_lon
      • fullnamepath: /gt2r/geolocation/sigma_lon
    gt2r_geolocation_ref_azimuth[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: radians
      • long_name: Azimuth
      • standard_name: azimuth
      • description: Azimuth 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: ATL03G ATBD, Section 3.3
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: ref_azimuth
      • fullnamepath: /gt2r/geolocation/ref_azimuth
    gt2r_geolocation_ref_elev[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: radians
      • long_name: elevation
      • standard_name: elevation
      • description: Elevation of the unit pointing vector for the reference photon in the local ENU frame in radians. The angle is measured from East-North plane and positive towards Up
      • source: ATL03G ATBD, Section 3.3
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: ref_elev
      • fullnamepath: /gt2r/geolocation/ref_elev
    gt2r_geolocation_neutat_ht[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Neutral atmosphere ref height
      • description: Reference height of the neutral atmosphere range correction
      • source: ATL03a ATBD
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: neutat_ht
      • fullnamepath: /gt2r/geolocation/neutat_ht
    gt2r_geolocation_solar_azimuth[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: degrees_east
      • long_name: solar azimuth
      • description: The azimuth of the sun position vector from the reference photon bounce point position in the local ENU frame. The angle is measured from North and is positive towards East. ATL03g provides this value in radians; it is converted to degrees for ATL03 output.
      • source: ATL03G ATBD, Section 3.3
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: solar_azimuth
      • fullnamepath: /gt2r/geolocation/solar_azimuth
    gt2r_geolocation_surf_type[ gt2r_geolocation_delta_time= 0 ..149895] [ 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 reference_photon_lat reference_photon_lon
      • flag_meanings: not_type is_type
      • flag_values: 0, 1
      • valid_min: 0
      • valid_max: 1
      • origname: surf_type
      • fullnamepath: /gt2r/geolocation/surf_type
    gt2r_geolocation_sigma_lat[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • long_name: latitude uncertainty
      • description: Estimated geodetic Latitude uncertainty (1-sigma), for the reference photon bounce point.
      • source: ATL03G ATBD, Section 3.6
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: sigma_lat
      • fullnamepath: /gt2r/geolocation/sigma_lat
    gt2r_geolocation_tx_pulse_width_lower[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: seconds
      • long_name: Transmit Pulse Energy Lower Width
      • description: The average distance between the lower threshold crossing times measured by the Start Pulse Detector.
      • source: ATL02 ATBD, Section 7.2
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: tx_pulse_width_lower
      • fullnamepath: /gt2r/geolocation/tx_pulse_width_lower
    gt2r_geolocation_sigma_along[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: along-track geolocation uncertainity
      • description: Estimated cartesian along-track uncertainanty (1-sigma) for the reference photon
      • source: ATL03G ATBD
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: sigma_along
      • fullnamepath: /gt2r/geolocation/sigma_along
    gt2r_geolocation_tx_pulse_skew_est[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: seconds
      • long_name: Transmit Pulse Skew Estimate
      • description: The difference between the averages of the lower and upper threshold crossing times. This is an estimate of the transmit pulse skew.
      • source: ATL02 ATBD, Section 7.2
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: tx_pulse_skew_est
      • fullnamepath: /gt2r/geolocation/tx_pulse_skew_est
    gt2r_geolocation_tx_pulse_energy[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: Joules
      • contentType: physicalMeasurement
      • long_name: Transmit Pulse Energy
      • description: The average transmit pulse energy, measured by the internal laser energy monitor, split into per-beam measurements.
      • source: ATL02 ATBD, Section 7.2
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: tx_pulse_energy
      • fullnamepath: /gt2r/geolocation/tx_pulse_energy
    gt2r_geolocation_tx_pulse_width_upper[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: seconds
      • long_name: Transmit Pulse Energy Upper Width
      • description: The average distance between the upper threshold crossing times measured by the Start Pulse Detector.
      • source: ATL02 ATBD, Section 7.2
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: tx_pulse_width_upper
      • fullnamepath: /gt2r/geolocation/tx_pulse_width_upper
    gt2r_geolocation_sigma_h[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: 1
      • long_name: height uncertainty
      • description: Estimated height uncertainty (1-sigma) for the reference photon bounce point.
      • source: ATL03G ATBD, Section 3.6
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: sigma_h
      • fullnamepath: /gt2r/geolocation/sigma_h
    gt2r_geolocation_podppd_flag[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Int16)
    • attributes
      • _FillValue: 0
      • units: 1
      • long_name: POD_PPD Flag
      • description: Composite POD/PPD flag that indicates the quality of input geolocation products for the specific ATL03 segment. A non-zero value may indicate that geolocation solutions are degraded. The ATL03 sigma values should indicate the degree of uncertainty associated with the degredation. Possible values are: 0=NOMINAL; 1=LRS; 2=LASERS; 3=GYRO; 4=SST1; 5=SST2; 6=ATT_INTERP; 7=MANEUVER; 8=GPS_DATA_GAP; 9-ST_BLINDING; 10=OTHER. Values 1-6 (PPD) are prioritized over values 7-10 (POD). In the case where both POD and PPD report an error, only the PAD value is indicated.
      • source: ANC04, ANC05
      • coordinates: delta_time
      • flag_meanings: nominal lrs lasers gyro sst1 sst2 att_interp maneuver gps_data_gap st_blinding other
      • flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
      • valid_min: 0
      • valid_max: 10
      • origname: podppd_flag
      • fullnamepath: /gt2r/geolocation/podppd_flag
    gt2r_geolocation_velocity_sc[ gt2r_geolocation_delta_time= 0 ..149895] [ ds_xyz= 0 ..2] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters/second
      • long_name: spacecraft velocity
      • description: Spacecraft velocity components (east component, north component, up component) an observer on the ground would measure. While values are common to all beams, this parameter is naturally produced as part of geolocation.
      • source: ATL03G ATBD
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: velocity_sc
      • fullnamepath: /gt2r/geolocation/velocity_sc
    gt2r_geolocation_segment_id[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Int32)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: along-track segment ID number.
      • description: A 7 digit number identifiying the along-track geolocation segment number. These are sequential, starting with 1 for the first segment after an ascending equatorial crossing node.
      • source: ATL03 ATBD, Section 3.1
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: segment_id
      • fullnamepath: /gt2r/geolocation/segment_id
    gt2r_geolocation_reference_photon_lat[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float64)
    • attributes
      • units: degrees_north
      • long_name: Segment Latitude
      • standard_name: latitude
      • description: Latitude of each reference photon. Computed from the ECF Cartesian coordinates of the bounce point. In the case of no photons within the segment (segment_ph_cnt=0), the coordinates are the midpoint of the geolocation segment on the reference ground track.
      • source: ATL03G ATBD, Section 3.4
      • coordinates: delta_time
      • valid_min: -90.000000000000000
      • valid_max: 90.000000000000000
      • origname: reference_photon_lat
      • fullnamepath: /gt2r/geolocation/reference_photon_lat
    gt2r_geolocation_solar_elevation[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: degrees
      • long_name: solar elevation
      • description: The elevation of the sun position vector from the reference photon bounce point position in the local ENU frame. The angle is measured from the East-North plane and is positive Up. ATL03g provides this value in radians; it is converted to degress for ATL03 output.
      • source: ATL03G ATBD, Section 3.3
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: solar_elevation
      • fullnamepath: /gt2r/geolocation/solar_elevation
    gt2r_geolocation_bounce_time_offset[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: seconds
      • long_name: ground bounce time offset
      • description: The difference between the transmit time and the ground bounce time of the reference photons.
      • source: ATL03 ATBD, Section 3.3
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: bounce_time_offset
      • fullnamepath: /gt2r/geolocation/bounce_time_offset
    gt2r_geolocation_reference_photon_index[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Int32)
    • attributes
      • _FillValue: 0
      • units: counts
      • long_name: Reference Photon Index
      • description: Index of the reference photon within the set of photons grouped within in segment. To recover the position of the reference photon within the photon-rate arrays, add ref_ph_ndx to the corresponding ph_ndx_beg and subtract 1. If no reference photon was selected, this value will indicate that the reference photon defaulted to the first photon. In the case of no photons within the segment (segment_ph_cnt=0), the value should be 0.
      • source: ATL03 ATBD, Section 3.2
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: reference_photon_index
      • fullnamepath: /gt2r/geolocation/reference_photon_index
    gt2r_geolocation_altitude_sc[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float64)
    • attributes
      • _FillValue: 1.7976931348623157e+308
      • units: meters
      • long_name: Altitude
      • description: Height of the spacecraft above the WGS84 ellipsoid.
      • source: ATL03g ATBD, Section 3.4
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: altitude_sc
      • fullnamepath: /gt2r/geolocation/altitude_sc
    gt2r_geolocation_segment_dist_x[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float64)
    • attributes
      • units: meters
      • long_name: Segment Distance from EQC
      • description: Along-track distance from the equator crossing to the start of the 20 meter geolocation segment.
      • source: Derived
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: segment_dist_x
      • fullnamepath: /gt2r/geolocation/segment_dist_x
    gt2r_geolocation_neutat_delay_total[ gt2r_geolocation_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Total Neutral Atmospheric Delay
      • description: Total neutral atmosphere delay correction (wet+dry).
      • source: ATL03a ATBD
      • coordinates: delta_time reference_photon_lat reference_photon_lon
      • origname: neutat_delay_total
      • fullnamepath: /gt2r/geolocation/neutat_delay_total
    gt2r_geophys_corr_tide_oc_pole[ gt2r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Ocean Pole Tide
      • description: Surface deformation of the Earth due to loading from the centrifugal effect of polar motion upon the oceans (-2 to 2 mm).
      • source: ATL03 ATBD, Section 6.3.6
      • coordinates: delta_time
      • origname: tide_oc_pole
      • fullnamepath: /gt2r/geophys_corr/tide_oc_pole
    gt2r_geophys_corr_dem_flag[ gt2r_geophys_corr_delta_time= 0 ..149895] (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: ATL03 ATBD Section 6.3
      • coordinates: delta_time
      • 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/geophys_corr/dem_flag
    gt2r_geophys_corr_tide_ocean[ gt2r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • long_name: Ocean Tide
      • _FillValue: 3.402823466e+38
      • units: meters
      • description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium). This correction is not applied to the photon heights and provided only as supplemental information.
      • source: ATL03 ATBD, Section 6.3.1
      • coordinates: delta_time
      • origname: tide_ocean
      • fullnamepath: /gt2r/geophys_corr/tide_ocean
    gt2r_geophys_corr_tide_earth[ gt2r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Earth Tide
      • description: Solid Earth Tides
      • source: ATL03 ATBD, Section 6.3.3
      • coordinates: delta_time
      • origname: tide_earth
      • fullnamepath: /gt2r/geophys_corr/tide_earth
    gt2r_geophys_corr_dac[ gt2r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Dynamic Atmosphere Correction
      • description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. This correction is not applied to the photon heights and provided only as supplemental information.
      • source: ATL03 ATBD, Section 6.3.2
      • coordinates: delta_time
      • origname: dac
      • fullnamepath: /gt2r/geophys_corr/dac
    gt2r_geophys_corr_tide_load[ gt2r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Load Tide
      • description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm).
      • source: ATL03 ATBD, Section 6.3.4
      • coordinates: delta_time
      • origname: tide_load
      • fullnamepath: /gt2r/geophys_corr/tide_load
    gt2r_geophys_corr_dem_h[ gt2r_geophys_corr_delta_time= 0 ..149895] (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 location of the reference photon.
      • source: ATL03 ATBD Section 6.3
      • coordinates: delta_time
      • origname: dem_h
      • fullnamepath: /gt2r/geophys_corr/dem_h
    gt2r_geophys_corr_tide_equilibrium[ gt2r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • contentType: referenceInformation
      • long_name: Long Period Equilibrium Tide
      • description: Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). This correction is not applied to the photon heights and is provided only as a supplemental information.
      • source: ATL03 ATBD, Section 6.3.1
      • coordinates: delta_time
      • origname: tide_equilibrium
      • fullnamepath: /gt2r/geophys_corr/tide_equilibrium
    gt2r_geophys_corr_geoid[ gt2r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Geoid
      • description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m). Not applied on the product; requested by higher-level products.
      • source: ATL03 ATBD, Section 6.3.8
      • coordinates: delta_time
      • origname: geoid
      • fullnamepath: /gt2r/geophys_corr/geoid
    gt2r_geophys_corr_tide_pole[ gt2r_geophys_corr_delta_time= 0 ..149895] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: Solid Earth Pole Tide
      • description: Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm).
      • source: ATL03 ATBD, Section 6.3.5
      • coordinates: delta_time
      • origname: tide_pole
      • fullnamepath: /gt2r/geophys_corr/tide_pole
    gt2r_signal_find_output_ocean_bckgrd_mean[ gt2r_signal_find_output_ocean_delta_time= 0 ..72106] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: counts
      • long_name: background counts per bin
      • description: The mean of the number of background counts expected in one height bin of the histogram of width dzATM over time period, dtATM
      • source: ATL03 ATBD, Section 5
      • coordinates: delta_time
      • origname: bckgrd_mean
      • fullnamepath: /gt2r/signal_find_output/ocean/bckgrd_mean
    gt2r_signal_find_output_ocean_bckgrd_sigma[ gt2r_signal_find_output_ocean_delta_time= 0 ..72106] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: counts
      • long_name: background counts per bin sigma
      • description: The standard deviation of the number of background counts expected in one height bin of the histogram of width dzATM over time period, dtATM
      • source: ATL03 ATBD, Section 5
      • coordinates: delta_time
      • origname: bckgrd_sigma
      • fullnamepath: /gt2r/signal_find_output/ocean/bckgrd_sigma
    gt2r_signal_find_output_ocean_t_pc_delta[ gt2r_signal_find_output_ocean_delta_time= 0 ..72106] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: seconds
      • long_name: bin width size
      • description: The histogram bin width (integration time) along-track used to find signal photons.
      • source: ATL03 ATBD, Section 5
      • coordinates: delta_time
      • origname: t_pc_delta
      • fullnamepath: /gt2r/signal_find_output/ocean/t_pc_delta
    gt2r_signal_find_output_ocean_z_pc_delta[ gt2r_signal_find_output_ocean_delta_time= 0 ..72106] (Type is Float32)
    • attributes
      • _FillValue: 3.402823466e+38
      • units: meters
      • long_name: bin height size
      • description: Height bin size of the histogram used to find signal photons.
      • source: ATL03 ATBD, Section 5
      • coordinates: delta_time
      • origname: z_pc_delta
      • fullnamepath: /gt2r/signal_find_output/ocean/z_pc_delta
    gt2r_heights_ph_id_count[ gt2r_heights_delta_time= 0 ..1.043505E6] (Type is Int16)
    • attributes
      • units: counts
      • long_name: photon event counter
      • description: The photon event counter is part of photon ID and counts from 1 for each channel until reset by laser pulse counter.
      • source: Derived as part of Photon ID
      • coordinates: delta_time lat_ph lon_ph
      • contentType: referenceInformation
      • origname: ph_id_count
      • fullnamepath: /gt2r/heights/ph_id_count
    gt2r_heights_lat_ph[ gt2r_heights_delta_time= 0 ..1.043505E6] (Type is Float64)
    • attributes
      • units: degrees_north
      • long_name: Latitude
      • standard_name: latitude
      • description: Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point.
      • source: ATL03g ATBD, Section 3.4
      • coordinates: delta_time lon_ph
      • valid_min: -90.000000000000000
      • valid_max: 90.000000000000000
      • origname: lat_ph
      • fullnamepath: /gt2r/heights/lat_ph
    gt2r_heights_dist_ph_along[ gt2r_heights_delta_time= 0 ..1.043505E6] (Type is Float32)
    • attributes
      • units: meters
      • long_name: Distance from equator crossing.
      • description: Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack.
      • source: ATL03 ATBD, Section 3.1
      • coordinates: delta_time lat_ph lon_ph
      • origname: dist_ph_along
      • fullnamepath: /gt2r/heights/dist_ph_along
    gt2r_heights_signal_conf_ph[ gt2r_heights_delta_time= 0 ..1.043505E6] [ ds_surf_type= 0 ..4] (Type is Int16)
    • attributes
      • units: 1
      • contentType: qualityInformation
      • long_name: Photon Signal Confidence
      • description: Confidence level associated with each photon event selected as signal. 0=noise. 1=added to allow for buffer but algorithm classifies as background; 2=low; 3=med; 4=high). This parameter is a 5xN array where N is the number of photons in the granule, and the 5 rows indicate signal finding for each surface type (in order: land, ocean, sea ice, land ice and inland water). Events not associated with a specific surface type have a confidence level of -1. Events evaluated as TEP returns have a confidence level of -2.
      • source: ATL03 ATBD, Section 5, Conf
      • coordinates: delta_time lat_ph lon_ph
      • flag_meanings: possible_tep not_considered noise buffer low medium high
      • flag_values: -2, -1, 0, 1, 2, 3, 4
      • valid_min: -2
      • valid_max: 4
      • origname: signal_conf_ph
      • fullnamepath: /gt2r/heights/signal_conf_ph
    gt2r_heights_ph_id_pulse[ gt2r_heights_delta_time= 0 ..1.043505E6] (Type is Byte)
    • attributes
      • units: counts
      • contentType: referenceInformation
      • long_name: laser pulse counter
      • description: The laser pulse counter is part of photon ID and counts from 1 to 200 and is reset for each new major frame.
      • source: Derived as part of Photon ID
      • coordinates: delta_time lat_ph lon_ph
      • origname: ph_id_pulse
      • fullnamepath: /gt2r/heights/ph_id_pulse
    gt2r_heights_h_ph[ gt2r_heights_delta_time= 0 ..1.043505E6] (Type is Float32)
    • attributes
      • units: meters
      • contentType: physicalMeasurement
      • long_name: Photon WGS84 Height
      • standard_name: height
      • description: Height of each received photon, relative to the WGS-84 ellipsoid including the geophysical corrections noted in Section 6. Please note that neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights.
      • source: ATL03g ATBD, Section 3.4
      • coordinates: delta_time lat_ph lon_ph
      • origname: h_ph
      • fullnamepath: /gt2r/heights/h_ph
    gt2r_heights_ph_id_channel[ gt2r_heights_delta_time= 0 ..1.043505E6] (Type is Byte)
    • attributes
      • units: 1
      • contentType: referenceInformation
      • long_name: Receive channel id
      • description: Channel number assigned for each received photon event. This is part of the photon ID. Values range from 1 to 120 to span all channels and rise/fall edges. Values 1 to 60 are for falling edge; PCE1 (1 to 20), PCE 2 (21 to 40) and PCE3 (41 to 60). Values 61 to 120 are for rising edge; PCE1 (61 to 80), PCE 2 (81 to 100) and PC3 (101 to 120).
      • source: Derived as part of Photon ID
      • coordinates: delta_time lat_ph lon_ph
      • valid_min: 1
      • valid_max: 120
      • origname: ph_id_channel
      • fullnamepath: /gt2r/heights/ph_id_channel
    gt2r_heights_lon_ph[ gt2r_heights_delta_time= 0 ..1.043505E6] (Type is Float64)
    • attributes
      • units: degrees_east
      • long_name: Longitude
      • standard_name: longitude
      • description: Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point.
      • source: ATL03g ATBD, Section 3.4
      • coordinates: delta_time lat_ph
      • valid_min: -180.00000000000000
      • valid_max: 180.00000000000000
      • origname: lon_ph
      • fullnamepath: /gt2r/heights/lon_ph
    gt2r_heights_pce_mframe_cnt[ gt2r_heights_delta_time= 0 ..1.043505E6] (Type is UInt32)
    • attributes
      • units: counts
      • contentType: referenceInformation
      • long_name: PCE Major frame counter
      • description: The major frame counter is read from the digital flow controller in a given PCE card. The counter identifies individual major frames across diag and science packets. Used as part of the photon ID.
      • source: Retained from prior a_alt_science_ph packet
      • coordinates: delta_time lat_ph lon_ph
      • origname: pce_mframe_cnt
      • fullnamepath: /gt2r/heights/pce_mframe_cnt
    gt2r_heights_dist_ph_across[ gt2r_heights_delta_time= 0 ..1.043505E6] (Type is Float32)
    • attributes
      • units: meters
      • long_name: Distance off RGT.
      • description: Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1.
      • source: ATL03 ATBD, Section 3.1
      • coordinates: delta_time lat_ph lon_ph
      • origname: dist_ph_across
      • fullnamepath: /gt2r/heights/dist_ph_across