2026-09-17T04:23:54Zhttp://nsidc.org/api/dataset/metadata/oai

oai:nsidc.org/ATL08QL.0062026-08-19T22:16:30Zcumulusecsretirednasa_nsidc_daac

ATL08QL.006ATLAS/ICESat-2 L3A Land and Vegetation Height Quick LookNeuenschwander, A. L., Pitts, K. L., Jelley, B. P., Robbins, J., Markel, J., Popescu, S. C., Nelson, R. F., Harding, D., Pederson, D., Klotz, B. & Sheridan, R.ATLAS/ICESat-2 L3A Land and Vegetation Height Quick Look2023-01-19Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center6false10.5067/ATLAS/ATL08QL.006https://nsidc.org/sites/default/files/documents/user-guide/atl08ql-v006-userguide.pdfATL08QLTechnical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468

CIRES, 449 UCB

University of Colorado

BoulderCO80309-0449USAEARTH SCIENCELAND SURFACETOPOGRAPHYTERRAIN ELEVATION EARTH SCIENCEBIOSPHEREVEGETATIONCANOPY CHARACTERISTICSVEGETATION HEIGHT Climatology/Meteorology/Atmosphereicesat2-projecticesat2-quick-lookATLASAdvanced Topographic Laser Altimeter SystemICESat-2Ice, Cloud, and land Elevation Satellite-22023-01-152025-06-17deprecated-9090-180180GEOGRAPHIC REGIONGLOBALVaries91 dayThese data have been retired and are no longer accessible, though a more recent version of these data may be available.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 https://www.earthdata.nasa.gov/engage/open-data-services-software-policies/data-use-guidance.EnglishNASA/GSFC/SED/ESD/I2-SIPSNASA NSIDC DAACNASA National Snow and Ice Data Center Distributed Active Archive Centerhttps://nsidc.org/daacData Center ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-6199

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

BoulderCO80309-0449USAHTTPSHDF5

ATL08QL is the quick look version of ATL08. Once final ATL08 files are available the corresponding ATL08QL files will be removed. ATL08 contains along-track heights above the WGS84 ellipsoid (ITRF2014 reference frame) for the ground and canopy surfaces. The canopy and ground surfaces are processed in fixed 100 m data segments, which typically contain more than 100 signal photons. 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.

VIEW RELATED INFORMATIONhttps://nsidc.org/sites/default/files/documents/user-guide/atl08ql-v006-userguide.pdfATLAS/ICESat-2 L3A Land and Vegetation Height Quick Look, Version 6 User GuideCEOS IDN DIFVERSION 9.92023-01-192026-08-19NSIDCVersion SummaryChanges for Version 6 are as follows: - Added a quality check to reject segments for which the canopy photons fall more than 150 m below the reference DEM - Calculated the background noise rate and number of noise photons within a canopy segment and adjusted the canopy radiometric rate accordingly - For segments with a solar elevation angle > 20°, if the background noise rate is < 0.98 of the canopy rate, then reassign the canopy photons as noise photons Incorporated the YAPC photon weights from the ATL03 data product into the ground-finding approach - Reduced the number of labeled photons required to report the canopy or terrain heights within each segment for the strong and weak beams, resulting in more ATL08 reported valuesNSIDCMinor VersionNSIDCSpatial Reference SystemsEPSG:4326WGS 84NSIDCLevel of ServiceNo Data AccessNSIDCFull Dataset CitationNeuenschwander, A. L., Pitts, K. L., Jelley, B. P., Robbins, J., Markel, J., Popescu, S. C., Nelson, R. F., Harding, D., Pederson, D., Klotz, B. & Sheridan, R. (2023). <i>ATLAS/ICESat-2 L3A Land and Vegetation Height Quick Look</i>. (ATL08QL, Version 6). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/ATLAS/ATL08QL.006">https://doi.org/10.5067/ATLAS/ATL08QL.006</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredtrue