Entry_ID: NSIDC-0304
Entry_Title: GLAS/ICESat 500 m Laser Altimetry Digital Elevation Model of Antarctica
Group: Data_Set_Citation
   Dataset_Creator: John P. DiMarzio
   Dataset_Title: GLAS/ICESat 500 m Laser Altimetry Digital Elevation Model of Antarctica
   Dataset_Release_Date: 2007-06-21
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC: National Snow and Ice Data Center
   Online_Resource: http://nsidc.org/data/nsidc-0304.html
End_Group
Group: Personnel
   Role: Investigator
   First_Name: John
   Last_Name: Dimarzio
   Email: john.dimarzio@gsfc.nasa.gov
   Phone: 1 301 614-5893 
   Group: Contact_Address
      Address: NASA/Goddard Space Flight Center
      Address: SGT, Inc.
      Address: SGT, Inc.
      Address: NASA/Goddard Space Flight Center
      Address: Cryospheric Sciences Branch Code 614.1
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Anita
   Last_Name: Brenner
   Email: anita.brenner@gsfc.nasa.gov
   Group: Contact_Address
      Address: NASA/Goddard Space Flight Center
      Address: SSAI
      Address: Code 614.5
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Helen
   Last_Name: Fricker
   Group: Contact_Address
      Address: Scripps Institution of Oceanography
      Address: Institute of Geophysics and Planetary Physics
      Address: University of California, San Diego
      Address: 9500 Gilman Dr.
      City: La Jolla
      Province_or_State: California
      Postal_Code: 92093
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Robert
   Last_Name: Schutz
   Group: Contact_Address
      Address: University of Texas at Austin
      Address: Center for Space Research
      Address: GLAS Science Team Lead
      Address: University of Texas at Austin
      Address: Center for Space Research
      City: Austin
      Province_or_State: TX
      Postal_Code: 78712-1085
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Christopher
   Middle_Name: A.
   Last_Name: Shuman
   Email: Christopher.A.Shuman@nasa.gov
   Phone: 1 301 614-5706 
   Group: Contact_Address
      Address: NASA/Goddard Space Flight Center
      Address: Cryospheric Sciences Branch
      Address: Cryospheric Sciences Branch
      Address: Code 614.1
      Address: NASA/Goddard Space Flight Center
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: H. Jay
   Last_Name: Zwally
   Email: Jay.Zwally@nasa.gov
   Phone: 1 301 614-5643 
   Fax: 1 301  614-5644 
   Group: Contact_Address
      Address: NASA/Goddard Space Flight Center
      Address: Laboratory for Hydrospheric Processes
      Address: Laboratory for Hydrospheric Processes
      Address: NASA/Goddard Space Flight Center
      Address: Code 971
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Technical Contact
   First_Name: NSIDC
   Last_Name: User Services
   Email: nsidc@nsidc.org
   Phone: 1 303 492-6199 x
   Fax: 1 303  492-2468 x
   Group: Contact_Address
      Address: National Snow and Ice Data Center
      Address: CIRES, 449 UCB
      Address: University of Colorado
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309-0449
      Country: USA
   End_Group
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Glacier Elevation/Ice Sheet Elevation
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Glacier Elevation/Ice Sheet Elevation
End_Group
ISO_Topic_Category: Elevation
Keyword: Altimetry
Keyword: Antarctica
Keyword: Antarctic Ice Sheet
Keyword: Dem
Keyword: Digital Elevation Model
Keyword: Elevation
Keyword: Ice Sheet
Keyword: Ice Sheet Elevation
Keyword: Polar
Keyword: Polar Stereographic
Keyword: South Pole
Sensor_Name: GLAS > Geoscience Laser Altimeter System
Source_Name: ICESAT > Ice, Cloud and Land Elevation Satellite
Group: Temporal_Coverage
   Start_Date: 2003-02-01
   Stop_Date: 2005-06-30
End_Group
Data_Set_Progress: complete
Group: Spatial_Coverage
   Southernmost_Latitude: -86
   Northernmost_Latitude: -63
   Westernmost_Longitude: -180
   Easternmost_Longitude: 180
End_Group
Group: Location
   Location_Category: CONTINENT
   Location_Type: ANTARCTICA
End_Group
Group: Data_Resolution
   Latitude_Resolution: 500 m
   Longitude_Resolution: 500 m
End_Group
Project: ICESAT > Ice, Cloud and Land Elevation Satellite
Group: Quality

   Slope and elevation accuracy of the DEMs is best near the latitudinal limit of 
   satellite coverage (±86°), and provides a good representation of the ice sheet 
   and mountain areas (based on comparison with satellite images). DEM accuracy 
   decreases as track spacing between ICESat profiles increases equatorward.

   As a quality and accuracy indicator, the mean distance of all contributing 
   GLAS surface spot data to the grid cell center was recorded in a separate 
   identical grid for each ice sheet. These mean distance files are provided with 
   the elevation data.

End_Group
Data_Set_Language: English
Group: Data_Center
   Data_Center_Name: NASA DAAC > NASA DAAC at the National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org/daac/index.html
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Data_Center
   Data_Center_Name: NSIDC > National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Size: 414 MB
   Distribution_Format: Binary
End_Group
Group: Reference

   Abshire, J., and 8 others. 2005. Geoscience Laser Altimeter System (GLAS) on 
   the ICESat mission: on-orbit measurement performance. Geophysical Research 
   Letters v. 32, L21S02, doi:10.1029/2005GL1024028. 

   Brenner, A., and 11 others. 2003. Derivation of range and range distributions 
   from laser pulse waveform analysis for surface elevations, roughness, slope, 
   and vegetations heights, Algorithm Theoretical Basis Document (ATBD) v.4.1, 
   available at http://www.csr.utexas.edu/glas/atbd.html.

   DiMarzio, J. P., A. C. Brenner, and H. J. Zwally. 2004. Comparison of Envisat 
   and ERS radar altimetry for ice –sheet elevation change studies. ESA Envisat 
   Sympsium, Salzburg, Austria, September 9, 2004.

   Krabill, W., W. Abdalati, and 7 others. 2002. Aircraft laser altimetry 
   measurement of elevation changes of the Greenland Ice Sheet: technique and 
   accuracy assessment. J. Geodynamics 34, 357-376. 

   Shuman, C., J. Zwally, B. Schutz, A. Brenner, J. DiMarzio, V. Schuedo, and H. 
   Fricker. 2006. ICESat Antarctic elevation data: preliminary precision and 
   accuracy assessment. Geophysical Research Letters 33, L07501, 
   doi:10.1029/2005GL025227. 

   Zwally, H. J., A. C. Brenner, J. A. Major, T. V. Martin, and R. A. 
   Bindschadler. 1990. Satellite radar altimetry over ice, Vol. 1. Processing and 
   corrections of Seasat data over Greenland. NASA Reference Publication 1233.

End_Group
Group: Summary

   The Geoscience Laser Altimeter System (GLAS) instrument on the Ice, Cloud, and 
   land Elevation Satellite (ICESat) provides global measurements of elevation, 
   and repeats measurements along nearly-identical tracks; its primary mission is 
   to measure changes in ice volume (mass balance) over time. This digital 
   elevation model (DEM) of Antarctica is derived from GLAS/ICESat laser 
   altimetry profile data and provides new surface elevation grids of the ice 
   sheets and coastal areas, with greater latitudinal extent and fewer 
   slope-related effects than radar altimetry.

   This DEM is generated from the first seven operational periods (from February 
   2003 through June 2005) of the GLAS instrument. It is provided on polar 
   stereographic grids at 500 m grid spacing. The grid covers all of Antarctica 
   north of 86° S. Elevations are reported as centimeters above the datums, 
   relative to both the WGS 84 ellipsoid and the EGM96 geoid, in two separate 
   elevation data files. A data quality map of the interpolation distance is 
   distributed in addition to the elevation data. ENVI header files are also 
   provided.

   The data are in 4-byte (long) signed integer binary files (big endian byte 
   order) and are available via FTP.

End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://nsidc.org/data/icesat/
   Description: Ice, Cloud, and land Elevation (ICESat) project page at NSIDC
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://nsidc.org/data/icesat/
   Description: ICESat/GLAS Data at NSIDC
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW RELATED INFORMATION
   End_Group
   URL: http://nsidc.org/data/nsidc-0305.html
   Description: GLAS/ICESat 1 km Laser Altimetry Digital Elevation Model of Greenland
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW RELATED INFORMATION
   End_Group
   URL: http://nsidc.org/data/dems/
   Description: Polar Ice Sheet DEMs and Elevation Data
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW RELATED INFORMATION
   End_Group
   URL: http://nsidc.org/data/dems/
   Description: Polar Ice Sheet DEMs and Topographic Data at NSIDC
End_Group
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 2007-06-21
Last_DIF_Revision_Date: 2013-10-07
Group: DIF_Revision_History

   Removed all service links and replaced them with one link to a landing page. 
   Moved A-Cap reference to guide doc. 

End_Group