2026-09-05T11:06:44Zhttp://nsidc.org/api/dataset/metadata/oai

oai:nsidc.org/GLA01.0332026-08-19T22:16:30Zcumulusecsretirednasa_nsidc_daac

GLA01.033GLAS/ICESat L1A Global Altimetry DataZwally, H. J., Schutz, R., Bentley, C., Bufton, J., Herring, T., Minster, J., Spinhirne, J. & Thomas, R.GLAS/ICESat L1A Global Altimetry Data2011-08-11Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center33false10.5067/ICESAT/GLAS/DATA121https://nsidc.org/sites/default/files/multi-gla01-v033-v034-userguide_0.pdfGLA01Technical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468

CIRES, 449 UCB

University of Colorado

BoulderCO80309-0449USAEARTH SCIENCESPECTRAL/ENGINEERINGINFRARED WAVELENGTHS Climatology/Meteorology/AtmosphereAltimetryBackscatterDAACDemDEMs Global-projectDEMs-projectEOSDISGLA01GLASGlobal Positioning SystemGPSICESatISIPSLaser PulseLidarNASANoise LevelNSIDCOff-nadir Pointing DirectionOrbit NumberPrecision Attitude DeterminationPrecision Orbit DeterminationRangeReceived EnergyReceived Pulse GainSignal SaturationTransmitted EnergyTransmitted GainWaveformWaveform KurtosisWaveform SkewnessALTIMETERSGLASGeoscience Laser Altimeter SystemICESATIce, Cloud, and land Elevation Satellite2003-02-202009-10-11deprecated-8686-180180Geographic RegionGlobal60 m to 70 m60 m to 70 m23 minuteBrowse products in PNG graphic format contain quality information; these are available along with corresponding data granules in the Data Pool or EOS Data Gateway. The i_FrameQF quality flag is set to '1' if there is a problem in calculating individual parameters, or the flag is set to '0' if there are no problems.EnglishNASA/GSFC/EOS/EONASA 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

BoulderCO80309-0449USAFTP9 MBBinaryBae, S. and B.E. Schutz. 2002. Precision attitude determination (PAD). GLAS algorithm theoretical basis document. Version 2.2. Austin, TX: Center for Space Research, University of Texas at Austin. Brenner, A.C., C.R. Bentley, B.M. Csatho, D.J. Harding, M.A. Hofton, J. Minster, L. Roberts, J.L. Saba, R. Schutz, R.H. Thomas, D. Yi, and H.J. Zwally. 2000. Derivation of range and range distributions from laser pulse waveform analysis for surface elevations, roughness, slope, and vegetation heights. Algorithm theoretical basis document. Version 3.0. Greenbelt, MD: Goddard Space Flight Center. Center for Space Research. 'ICESat/GLAS.' January 2002. http://www.csr.utexas.edu/glas/. Davis C.H. and H.J. Zwally. 1993. Geographic and seasonal variations in the surface properties of the ice sheets by satellite radar altimetry. Journal of Glaciology 39:687-697. Earth Science Data and Information System (ESDIS). 1996. EOS Ground System (EGS) Systems and Operations Concept. Greenbelt, MD: Goddard Space Flight Center. Farrell, W.E. 1972. Deformation of the Earth by surface loads. Review of Geophysics and Space Physics 10: 761-797. GLAS Science Team. 2000. Mission Operations Requirement Document (MORD) for the Ice, Cloud and Land Elevation Satellite (ICESat) Mission. Greenbelt, MD: Goddard Space Flight Center. GLAS Science Team. 1997. GLAS Science Requirements. Version 2.01. Greenbelt, MD: Goddard Space Flight Center. Heroux, D. 2000. Progress report on GLAS interface effort with ECS NOSE. Rev. 29 December 2000. Landover, MD: Emergent-IT/Raytheon. Herring, T.A. and K. Quinn. 1999. Atmospheric delay correction to GLAS laser altimeter ranges. GLAS algorithm theoretical basis document. Version 1.0. Lanham, MD: Science Systems and Applications, Inc. Jester, P., and D. Hancock. 2002. The Algorithm Theoretical Basis Document for Level 1A Processing, Version 1.2. Wallops Island, VA: Raytheon ITSS. Jester, P., and J. Lee. 2002. GLAS standard data products specification - level 1. Version 6.0. Wallops Island, VA: Raytheon ITSS. Lee, J. 2002. GSAS user's guide: Version 4.0. Wallops Island, VA: Raytheon ITSS. McGarry, J.F., J. Abshire, X. Sun, J. Saba, A. Brenner, and D. Yi. 2002. GLAS flight science data selection algorithms for the altimeter (1064 nm), Version 4.15. Unpublished report. Rim, H., and B. Schutz. 2002. Precision orbit determination. GLAS algorithm theoretical basis document. Version 2.2. Austin, TX: Center for Space Research, University of Texas at Austin. Schutz, B. 2000. GLAS altimeter post-launch calibration/validation plan. Version 0.99. Austin, TX: Center for Space Research, University of Texas at Austin. Schutz, B. 2002. Laser footprint location (geolocation) and surface profiles. GLAS algorithm theoretical basis document. Version 3.0. Austin, TX: Center for Space Research, University of Texas at Austin. Wahr, J., D. Wingham, and C. Bentley. 2000. A method of combining ICESat and GRACE satellite data to constrain Antarctic mass balance. Journal of Geophysical Research 105(B7):16,279-16,294. Yi, D., J. Minster, and C. Bentley. 1999. Ocean tidal loading corrections. GLAS algorithm theoretical basis document. Version 1.0. Greenbelt, MD: Goddard Space Flight Center. Zwally, H.J., B. Schutz, W. Abdalati, J. Abshire, C. Bentley, A. Brenner, J. Bufton, J. Dezio, D. Hancock, D. Harding, T. Herring, B. Minster, K. Quinn, S. Palm, J. Spinhirne, and R. Thomas. 2002. ICESAT's laser measurements of polar ice, atmosphere, ocean, and land. Journal of Geodynamics 34: 405-445. Zwally, H.J., B. Schutz, D. Hancock, and A. Brenner. 2000. ICESat/GLAS Standard Data Products in HDF and SCF Formats. Version 1.2. Greenbelt, MD: Goddard Space Flight Center. Zwally, H.J., R.A. Bindschadler, A.C. Brenner, T.V. Martin, and R.H. Thomas. 1983. Surface elevation contours of Greenland and Antarctic ice sheets. Journal of Geophysical Research 88(C3):1589-1596.

NOTE ON GLAS BINARY DATA: Access to all ICESat/GLAS binary data products at NSIDC DAAC was removed 1 August 2017. The Binary Data Subsetter also has been decommissioned. ICESat/GLAS data remain available in HDF5 format (GLAH01). The Geoscience Laser Altimeter System (GLAS) instrument on the Ice, Cloud, and Land Elevation Satellite (ICESat) provides global measurements of polar ice sheet elevation to discern changes in ice volume (mass balance) over time. Secondary objectives of GLAS are to measure sea ice roughness and thickness, cloud and atmospheric properties, land topography, vegetation canopy heights, ocean surface topography, and surface reflectivity. GLAS has a 1064 nm laser channel for surface altimetry and dense cloud heights, and a 532 nm lidar channel for the vertical distribution of clouds and aerosols. Level-1A altimetry data (GLA01) include the transmitted and received waveform from the altimeter. Each data granule has an associated browse product that users can quickly view to determine the general quality of the data in the granule. Browse products consist of image plots of key parameters and statistics. Data are in scaled integer binary format, big-endian (Unix) byte order.

VIEW RELATED INFORMATIONhttps://nsidc.org/sites/default/files/multi-gla01-v033-v034-userguide_0.pdfGLAS/ICESat L1A Global Altimetry Data, Version 33 User GuidePROJECT HOME PAGEhttp://nsidc.org/data/icesat/index.htmlICESat/GLAS Data at NSIDCPROJECT HOME PAGEhttp://icesat.gsfc.nasa.gov/ICESat/GLAS web site at NASA Goddard Space Flight CenterPROJECT HOME PAGEhttp://glas.wff.nasa.gov/ICESat/GLAS web site at NASA Wallops Flight FacilityPROJECT HOME PAGEhttp://www.csr.utexas.edu/glas/ICESat/GLAS web site at University of TexasVIEW RELATED INFORMATIONhttp://nsidc.org/data/dems/index.htmlPolar Ice Sheet DEMs and Elevation DataUSA/NASACEOS IDN DIFVERSION 9.92011-08-112026-08-19NSIDCVersion SummarySee https://nsidc.org/data/icesat/version-historyNSIDCMinor VersionNSIDCCurrent Version1NSIDCLevel of ServiceNo Data AccessNSIDCFull Dataset CitationZwally, H. J., Schutz, R., Bentley, C., Bufton, J., Herring, T., Minster, J., Spinhirne, J. & Thomas, R. (2011). <i>GLAS/ICESat L1A Global Altimetry Data</i>. (GLA01, Version 33). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/ICESAT/GLAS/DATA121">https://doi.org/10.5067/ICESAT/GLAS/DATA121</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredtrue