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GLAS/ICESat 500 m Laser Altimetry Digital Elevation Model of Antarctica

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Entry ID

NSIDC-0304

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.

Geographic Coverage

 

Spatial Coordinates:
N: -63°     S: -86°     E: 180°     W: -180°    

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

Temporal Coverage

Start Date: 2003-02-01
Stop Date: 2005-06-30

Data Resolution

Latitude Resolution: 500 m
Longitude Resolution: 500 m

Location Keywords

  • CONTINENT ANTARCTICA

Science Keywords

  • Cryosphere Glaciers/Ice Sheets Glacier Elevation/Ice Sheet Elevation
  • Terrestrial Hydrosphere Glaciers/Ice Sheets Glacier Elevation/Ice Sheet Elevation

Ancillary Keywords

  • Altimetry
  • Antarctica
  • Antarctic Ice Sheet
  • Dem
  • Digital Elevation Model
  • Elevation
  • Ice Sheet
  • Ice Sheet Elevation
  • Polar
  • Polar Stereographic
  • South Pole

ISO Topic Category (View Definitions)

  • Elevation

Platform

  • ICESAT Ice, Cloud and Land Elevation Satellite

Instrument

  • GLAS Geoscience Laser Altimeter System

Project

  • ICESAT Ice, Cloud and Land Elevation Satellite

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.

Data Set Progress

complete

Data Center

NASA DAAC at the National Snow and Ice Data Center
Data Center URL: http://nsidc.org/daac/index.html

Data Center Personnel

Name: NSIDC User Services
Phone: 1 303 492-6199
Fax: 1 303 492-2468
Email: nsidc@nsidc.org
Contact Address:

  • National Snow and Ice Data Center
  • CIRES, 449 UCB
  • University of Colorado

City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA

National Snow and Ice Data Center
Data Center URL: http://nsidc.org

Data Center Personnel

Name: NSIDC User Services
Phone: 1 303 492-6199
Fax: 1 303 492-2468
Email: nsidc@nsidc.org
Contact Address:

  • National Snow and Ice Data Center
  • CIRES, 449 UCB
  • University of Colorado

City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA

Distribution

Distribution Media: FTP
Distribution Size: 414 MB
Distribution Format: Binary

Personnel

John Dimarzio
Role: INVESTIGATOR
Phone: 1 301 614-5893
Email: john.dimarzio@gsfc.nasa.gov
Contact Address:

  • NASA/Goddard Space Flight Center
  • SGT, Inc.
  • SGT, Inc.
  • NASA/Goddard Space Flight Center
  • Cryospheric Sciences Branch Code 614.1

City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

Anita Brenner
Role: INVESTIGATOR
Email: anita.brenner@gsfc.nasa.gov
Contact Address:

  • NASA/Goddard Space Flight Center
  • SSAI
  • Code 614.5

City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

Helen Fricker
Role: INVESTIGATOR
Contact Address:

  • Scripps Institution of Oceanography
  • Institute of Geophysics and Planetary Physics
  • University of California, San Diego
  • 9500 Gilman Dr.

City: La Jolla
Province or State: California
Postal Code: 92093
Country: USA

Robert Schutz
Role: INVESTIGATOR
Contact Address:

  • University of Texas at Austin
  • Center for Space Research
  • GLAS Science Team Lead
  • University of Texas at Austin
  • Center for Space Research

City: Austin
Province or State: TX
Postal Code: 78712-1085
Country: USA

Christopher A. Shuman
Role: INVESTIGATOR
Phone: 1 301 614-5706
Email: Christopher.A.Shuman@nasa.gov
Contact Address:

  • NASA/Goddard Space Flight Center
  • Cryospheric Sciences Branch
  • Cryospheric Sciences Branch
  • Code 614.1
  • NASA/Goddard Space Flight Center

City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

H. Jay Zwally
Role: INVESTIGATOR
Phone: 1 301 614-5643
Fax: 1 301 614-5644
Email: Jay.Zwally@nasa.gov
Contact Address:

  • NASA/Goddard Space Flight Center
  • Laboratory for Hydrospheric Processes
  • Laboratory for Hydrospheric Processes
  • NASA/Goddard Space Flight Center
  • Code 971

City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

NSIDC User Services
Role: TECHNICAL CONTACT
Phone: 1 303 492-6199 x
Fax: 1 303 492-2468 x
Email: nsidc@nsidc.org
Contact Address:

  • National Snow and Ice Data Center
  • CIRES, 449 UCB
  • University of Colorado

City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA

Related URL

VIEW PROJECT HOME PAGE
Ice, Cloud, and land Elevation (ICESat) project page at NSIDC

VIEW PROJECT HOME PAGE
ICESat/GLAS Data at NSIDC

VIEW RELATED INFORMATION
GLAS/ICESat 1 km Laser Altimetry Digital Elevation Model of Greenland

VIEW RELATED INFORMATION
Polar Ice Sheet DEMs and Elevation Data

VIEW RELATED INFORMATION
Polar Ice Sheet DEMs and Topographic Data at NSIDC

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.

Metadata Name and Version

Metadata Name: CEOS IDN DIF
Metadata Version: 9.7

Creation and Review Dates

DIF Creation Date: 2007-06-21
Last DIF Revision Date: 2013-10-07

Metadata Views

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Directory Interchange Format (DIF) in plain text

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Directory Interchange Format (DIF) in Extensible Markup Language (XML)

FGDC HTML

U.S. Federal Geographic Data Committee (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM)

ISO HTML

International Organization for Standardization (ISO) 19115:2003 Geographic Information Metadata

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