<?xml version="1.0" encoding="UTF-8"?><OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd"><responseDate>2026-05-02T00:06:22Z</responseDate><request identifier="ATL07.006" metadataPrefix="dif" verb="GetRecord">http://nsidc.org/api/dataset/metadata/oai</request><GetRecord><record><header><identifier>oai:nsidc.org/ATL07.006</identifier><datestamp>2026-04-30T19:16:16Z</datestamp><setSpec>cumulus</setSpec><setSpec>retired</setSpec><setSpec>nasa_nsidc_daac</setSpec></header><metadata>
<DIF xmlns="http://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/ http://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/dif_v9.7.1.xsd"><Entry_ID>ATL07.006</Entry_ID><Entry_Title>ATLAS/ICESat-2 L3A Sea Ice Height</Entry_Title><Data_Set_Citation><Dataset_Creator>Kwok, R., Petty, A. A., Cunningham, G., Markus, T., Hancock, D., Ivanoff, A., Wimert, J., Bagnardi, M., Kurtz, N. &amp; the ICESat-2 Science Team</Dataset_Creator><Dataset_Title>ATLAS/ICESat-2 L3A Sea Ice Height</Dataset_Title><Dataset_Release_Date>2023-08-03</Dataset_Release_Date><Dataset_Release_Place>Boulder, Colorado USA</Dataset_Release_Place><Dataset_Publisher>NASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center</Dataset_Publisher><Version>6</Version><Other_Citation_Details><Invert_Citation_Order>false</Invert_Citation_Order></Other_Citation_Details><Dataset_DOI>10.5067/ATLAS/ATL07.006</Dataset_DOI><Online_Resource>https://nsidc.org/sites/default/files/documents/user-guide/atl07-v006-userguide.pdf</Online_Resource><Dataset_Series_Name>ATL07</Dataset_Series_Name></Data_Set_Citation><Personnel><Role>Technical Contact</Role><First_Name>NSIDC</First_Name><Last_Name>User Services</Last_Name><Email>nsidc@nsidc.org</Email><Phone>1-303-492-6199</Phone><Fax>1-303-492-2468</Fax><Contact_Address><Address>CIRES, 449 UCB</Address><Address>University of Colorado</Address><City>Boulder</City><Province_or_State>CO</Province_or_State><Postal_Code>80309-0449</Postal_Code><Country>USA</Country></Contact_Address></Personnel><Parameters><Category>EARTH SCIENCE</Category><Topic>CRYOSPHERE</Topic><Term>SEA ICE</Term><Variable_Level_1>SEA ICE ELEVATION</Variable_Level_1><Variable_Level_2> </Variable_Level_2><Variable_Level_3> </Variable_Level_3><Detailed_Variable> </Detailed_Variable></Parameters><ISO_Topic_Category>Climatology/Meteorology/Atmosphere</ISO_Topic_Category><Keyword>icesat2-project</Keyword><Sensor_Name><Short_Name>ATLAS</Short_Name><Long_Name>Advanced Topographic Laser Altimeter System</Long_Name></Sensor_Name><Source_Name><Short_Name>ICESat-2</Short_Name><Long_Name>Ice, Cloud, and land Elevation Satellite-2</Long_Name></Source_Name><Temporal_Coverage><Start_Date>2018-10-14</Start_Date><Stop_Date>2025-03-02</Stop_Date></Temporal_Coverage><Data_Set_Progress>deprecated</Data_Set_Progress><Spatial_Coverage><Southernmost_Latitude>-90</Southernmost_Latitude><Northernmost_Latitude>90</Northernmost_Latitude><Westernmost_Longitude>-180</Westernmost_Longitude><Easternmost_Longitude>180</Easternmost_Longitude></Spatial_Coverage><Location><Location_Category>GEOGRAPHIC REGION</Location_Category><Location_Type>NORTHERN HEMISPHERE</Location_Type></Location><Location><Location_Category>GEOGRAPHIC REGION</Location_Category><Location_Type>SOUTHERN HEMISPHERE</Location_Type></Location><Data_Resolution><Longitude_Resolution>Varies</Longitude_Resolution><Temporal_Resolution>91 day</Temporal_Resolution></Data_Resolution><Access_Constraints>These data have been retired and are no longer accessible, though a more recent version of these data may be available.</Access_Constraints><Use_Constraints>These data have been retired and are no longer available for use, though a more recent version of these data may be available. Cite any prior or planned use of these data according to the recommended citation at https://nsidc.org/about/data-use-and-copyright. For more information on the NASA ESDIS Data Use Guidance, see&#xA0;https://www.earthdata.nasa.gov/engage/open-data-services-software-policies/data-use-guidance.</Use_Constraints><Data_Set_Language>English</Data_Set_Language><Originating_Center>NASA/GSFC/SED/ESD/I2-SIPS</Originating_Center><Data_Center><Data_Center_Name><Short_Name>NASA NSIDC DAAC</Short_Name><Long_Name>NASA National Snow and Ice Data Center Distributed Active Archive Center</Long_Name></Data_Center_Name><Data_Center_URL>https://nsidc.org/daac</Data_Center_URL><Personnel><Role>Data Center Contact</Role><First_Name>NSIDC</First_Name><Last_Name>User Services</Last_Name><Email>nsidc@nsidc.org</Email><Phone>1-303-492-6199</Phone><Contact_Address><Address>National Snow and Ice Data Center</Address><Address>CIRES, 449 UCB</Address><Address>University of Colorado</Address><City>Boulder</City><Province_or_State>CO</Province_or_State><Postal_Code>80309-0449</Postal_Code><Country>USA</Country></Contact_Address></Personnel></Data_Center><Distribution><Distribution_Media>HTTPS</Distribution_Media><Distribution_Format>HDF5</Distribution_Format></Distribution><Reference/><Summary><Abstract>The data set (ATL07) contains along-track heights for sea ice and open water leads (at varying length scales) relative to the WGS84 ellipsoid (ITRF2014 reference frame) after adjustment for geoidal and tidal variations, and inverted barometer effects. Height statistics and apparent reflectance are also provided. The data were acquired by the Advanced Topographic Laser Altimeter System (ATLAS) instrument on board the Ice, Cloud and land Elevation Satellite-2 (ICESat-2) observatory.</Abstract></Summary><Related_URL><URL_Content_Type><Type>VIEW RELATED INFORMATION</Type></URL_Content_Type><URL>https://nsidc.org/sites/default/files/documents/user-guide/atl07-v006-userguide.pdf</URL><Description>ATLAS/ICESat-2 L3A Sea Ice Height, Version 6 User Guide</Description></Related_URL><Metadata_Name>CEOS IDN DIF</Metadata_Name><Metadata_Version>VERSION 9.9</Metadata_Version><DIF_Creation_Date>2023-08-03</DIF_Creation_Date><Last_DIF_Revision_Date>2026-04-30</Last_DIF_Revision_Date><Extended_Metadata><Metadata><Group>NSIDC</Group><Name>Version Summary</Name><Value>Added new uncorrected sea ice segment height parameter; Added AMSR2 sea ice concentration data; Implemented land filtering; Added ANC10 ancillary file to read in sea level pressure; Added YAPC parameters; Introduced interpolation and extrapolation routines for ocean tides and mean sea surface (MSS); Updated the PODPPD_flag filter so that a processing option is available for every flag value; Implemented dynamic inverted barometer for processing; read/interpolate sea level pressure directly from ANC10; Added lineage information to the metadata; Updated the MSS variables description, added mentions of the source of the MSS, and clarified the use of the tide free system.</Value></Metadata><Metadata><Group>NSIDC</Group><Name>Minor Version</Name><Value><number>1</number><summary>Data were reprocessed using ITRF2014 (replacing ITRF2020) for consistency across the entire data set.</summary><start_datetime>2022-11-13</start_datetime><end_datetime>2023-10-26</end_datetime><view_order>0</view_order></Value></Metadata><Metadata><Group>NSIDC</Group><Name>Spatial Reference Systems</Name><Value><Spatial_Reference_System><SRID>EPSG:4326</SRID><Description>WGS 84</Description></Spatial_Reference_System></Value></Metadata><Metadata><Group>NSIDC</Group><Name>Level of Service</Name><Value><Level>No Data Access</Level></Value></Metadata><Metadata><Group>NSIDC</Group><Name>Full Dataset Citation</Name><Value>Kwok, R., Petty, A. A., Cunningham, G., Markus, T., Hancock, D., Ivanoff, A., Wimert, J., Bagnardi, M., Kurtz, N. &amp; the ICESat-2 Science Team. (2023). &lt;i&gt;ATLAS/ICESat-2 L3A Sea Ice Height&lt;/i&gt;. (ATL07, Version 6). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. &lt;a href="https://doi.org/10.5067/ATLAS/ATL07.006"&gt;https://doi.org/10.5067/ATLAS/ATL07.006&lt;/a&gt;. 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