GLA04GLAS/ICESat L1A Global Laser Pointing DataZwally, H. J., R. Schutz, and J. Abshire.GLAS/ICESat L1A Global Laser Pointing Data2011-08-11Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center33false10.5067/ICESAT/GLAS/DATA124https://doi.org/10.5067/ICESAT/GLAS/DATA124GLA04InvestigatorH.JayZwallyJay.Zwally@nasa.gov1-301-614-56431-301-614-5644Laboratory for Hydrospheric ProcessesNASA/Goddard Space Flight CenterCode 971GreenbeltMD20771USAInvestigatorRobertSchutzGLAS Science Team LeadUniversity of Texas at AustinCenter for Space ResearchAustinTX78712-1085USAInvestigatorJamesAbshireNASA/Goddard Space Flight CenterGreenbeltMD20771Technical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468CIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAEARTH SCIENCESpectral/EngineeringPlatform CharacteristicsAttitude Characteristics ATTITUDE CHARACTERISTICSEARTH SCIENCESpectral/EngineeringPlatform CharacteristicsViewing Geometry VIEWING GEOMETRYGeoscientific InformationDAACEOSDISGLA04GLASHRG GyroICESatInstrument Star TrackerISIPSLaser Reference SystemNASANSIDCSpacecraft Star TrackerALTIMETERSGLASGeoscience Laser Altimeter SystemICESATIce, Cloud, and land Elevation Satellite2003-02-202009-10-11complete-8686-180180593 kilometers623 kilometersGeographic RegionGlobal60 m to 70 m60 m to 70 m3 hourICESATIce, Cloud and Land Elevation SatelliteEnglishNASA/GSFC/EOS/EONASA NSIDC DAACNASA National Snow and Ice Data Center Distributed Active Archive Centerhttps://nsidc.org/daacData Center ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-6199National Snow and Ice Data CenterCIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAFTP2 to 386 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.
Center for Space Research. 'ICESat/GLAS.' January 2002.
http://www.csr.utexas.edu/glas/.
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. 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.
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.NOTE ON GLAS BINARY DATA: Access to all ICESat/GLAS binary data products at NSIDC DAAC was removed 01 August 2017. The Binary Data Subsetter also has been decommissioned. ICESat/GLAS data remain available in <a href="http://nsidc.org/data/glah04/versions/33">HDF5 format</a>.
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 global laser pointing data (GLA04) contain two orbits of attitude data from the spacecraft star tracker, instrument star tracker, gyro, and laser reference system, and other spacecraft attitude data required to calculate precise laser pointing. Data are in scaled integer binary format, big-endian (Unix) byte order.https://doi.org/10.5067/ICESAT/GLAS/DATA124GET DATAhttps://nsidc.org/data/data-access-tool/GLA04/versions/33/Data Access ToolPROJECT HOME PAGEhttp://glas.wff.nasa.gov/ICESat/GLAS web site at NASA Wallops Flight FacilityPROJECT HOME PAGEhttp://icesat.gsfc.nasa.gov/ICESat/GLAS web site at NASA Goddard Space Flight CenterPROJECT HOME PAGEhttp://www.csr.utexas.edu/glas/ICESat/GLAS web site at University of TexasPROJECT HOME PAGEhttp://nsidc.org/data/icesat/index.htmlICESat/GLAS Data at NSIDCUSA/NASACEOS IDN DIFVERSION 9.92011-08-112024-01-25NSIDCVersion SummaryFor information about Version 33, visit the ICESat/GLAS Version History page: <a href="https://nsidc.org/data/icesat/version-history">https://nsidc.org/data/icesat/version-history</a>NSIDCMinor VersionNSIDCCurrent Version1NSIDCLevel of ServiceNo Data AccessNSIDCFull Dataset CitationZwally, H. J., R. Schutz, and J. Abshire. 2011. <i>GLAS/ICESat L1A Global Laser Pointing Data.</i> Version 33. [indicate subset used]. Boulder, Colorado USA: NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/ICESAT/GLAS/DATA124">https://doi.org/10.5067/ICESAT/GLAS/DATA124</a>. 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Bulk download using spatial and temporal filters, or incorporate data access commands into code/scripts as needed.https://nsidc.org/support/how/how-do-i-programmatically-request-data-servicesVIEW RELATED INFORMATIONProgrammatic Data Access GuidePublicationURLUSER SERVICESNSIDC DAAC User ServicesEmailnsidc@nsidc.org2023-04-19T00:00:00.000ZDATA ACCESS/RETRIEVALDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESThis is the most current release of this service. 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