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Seasat and GEOSAT Altimetry for the Antarctic and Greenland Ice Sheets

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Entry ID

NSIDC-0053

Summary

Note: This data set is now on FTP so references to CD-ROM are historic and no longer applicable.



The Ice Altimetry System (IAS) data seet contains surface elevations of the Antarctic and Greenland ice sheets derived from Seasat and GEOSAT radar altimetry data. The Seasat data were collected for a continuous 90 days in 1978, at latitudes between 72 degrees South and 72 degrees North. GEOSAT was launched in 1985 and placed in a nearly identical orbit to Seasat, also at latitudes of between 72 degrees South and 72 degrees North. The orbit was designed to provide high-density measurements over the Earth's surface, at a maximum grid spacing of 2.7 kilometers at the equator and much denser spacing over polar ice sheets. Data were acquired between April 1985 and September 1986.

Initially acquired by the Johns Hopkins APL (Applied Physics Lab) satellite tracking facility, the raw altimetry satellite data from Seasat and GEOSAT were passed on to NASA, via the US Navy. NASA developed slope correction routines for the higher slopes over the ice sheets, relative to ocean surfaces. The data are height profile Level 3 data and gridded height Level 4 data provided by the Oceans and Ice branch of the Laboratory for Hydrospheric Physics of Goddard Space Flight Center. Elevations from the full data rate (i.e., one measurement every 662.5 m) are provided in georeferenced databases. These elevations are relative to the WGS-84 ellipsoid. Gridded elevations at 10-kilometer and 20-kilometer spacing are provided in the gridded data sets created from the GEOSAT and Seasat data, respectively. Software to extract and browse subsets of these data is included. The IAS software also allows the user to view contours created from the gridded data and groundtracks of the full-rate data.

Geographic Coverage

 

Spatial Coordinates:
N: 72°     S: 60°     E: -20°     W: -60°    

Data Set Citation

Dataset Creator: Zwally, J. and A. Brenner
Dataset Title: Seasat and GEOSAT Altimetry for the Antarctic and Greenland Ice Sheets
Dataset Release Date: 1997-01-01
Dataset Release Place: Boulder, Colorado USA
Dataset Publisher: NSIDC: National Snow and Ice Data Center
Online Resource: http://nsidc.org/data/nsidc-0053.html

Temporal Coverage

Start Date: 1978-06-01
Stop Date: 1986-09-30

Location Keywords

  • CONTINENT ANTARCTICA
  • CONTINENT NORTH AMERICA GREENLAND

Science Keywords

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

Ancillary Keywords

  • Altimetry
  • Antarctic
  • Goddard Space Flight Center
  • Greenland
  • ice sheets
  • NASA
  • Radar
  • Radar Altimetry
  • Satellite Radar Data

Platform

  • GEOSAT Geodetic Satellite
  • SEASAT Ocean Dynamics Satellite

Instrument

  • RADAR ALTIMETERS

Project

  • EOSDIS Earth Observing System Data Information System
  • ESIP Earth Science Information Partners Program

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 Format: Binary

Distribution Media: FTP
Distribution Format: ASCII Text (.txt)

Personnel

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

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

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 RELATED INFORMATION
Polar Ice Sheet DEMs and Elevation Data

Reference

National Snow and Ice Data Center. 1985-1986. Users' Manual on the Ice Altimetry System CD-ROM.

NSIDC Distributed Active Archive Center, University of Colorado at Boulder. Seasat and GEOSAT Ice Altimetry Data. Digital data available from nsidc@kryos.colorado.edu. Boulder, Colorado.

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

Zwally, H. Jay, Judy A. Major, Anita C. Brenner, and Robert A. Bindschadler. 1987. Ice measurements by GEOSAT radar altimetry. Johns Hopkins APL Technical Digest. 8:2:251-254.

Metadata Name and Version

Metadata Name: CEOS IDN DIF
Metadata Version: 9.7

Creation and Review Dates

DIF Creation Date: 1997-01-01
Last DIF Revision Date: 2012-07-26

Metadata Views

DIF Text-Only

Directory Interchange Format (DIF) in plain text

DIF XML

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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