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Seasat and GEOSAT Altimetry for the Antarctic and Greenland Ice Sheets Entry ID: NSIDC-0053 |
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Summary
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Abstract:
The Ice Altimetry System (IAS) CD-ROM 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 on the CD-ROM. The IAS software also allows the user to view contours created from the gridded data and groundtracks of the full-rate data.
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| N: 72.0 | S: 60.0 | E: -20.0 | W: -60.0 |
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Data Set Citation
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Dataset Title:
Seasat and GEOSAT Altimetry for the Antarctic and Greenland Ice Sheets
Dataset Release Date: 1997-01-01 Dataset Release Place: Boulder, CO U.S.A. Dataset Publisher: National Snow and Ice Data Center (NSIDC) Online Resource: http://nsidc.org/data/nsidc-0053.html |
Temporal Coverage
| Start Date: 1978-06-01 |
| Stop Date: 1986-09-30 |
Location Keywords
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CONTINENT
> NORTH AMERICA
> GREENLAND
CONTINENT > ANTARCTICA GEOGRAPHIC REGION > ARCTIC GEOGRAPHIC REGION > POLAR |
Science Keywords
| CRYOSPHERE >GLACIERS/ICE SHEETS >ICE SHEETS [Definition] |
| TERRESTRIAL HYDROSPHERE >GLACIERS/ICE SHEETS >ICE SHEETS [Definition] |
| CRYOSPHERE >GLACIERS/ICE SHEETS >GLACIER ELEVATION/ICE SHEET ELEVATION [Definition] |
| TERRESTRIAL HYDROSPHERE >GLACIERS/ICE SHEETS >GLACIER ELEVATION/ICE SHEET ELEVATION [Definition] |
ISO Topic Category
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GEOSCIENTIFIC INFORMATION
INLAND WATERS |
Platform
| GEOSAT >Geodetic Satellite [Information] |
| SEASAT 1 >Ocean Dynamics Satellite [Information] |
Instrument
| Radar Altimeters [Information] |
Project
| EOSDIS >Earth Observing System Data Information System [Information] |
| ESIP >Earth Science Information Partners Program [Information] |
Keywords
| Altimetry |
| Antarctic |
| Goddard Space Flight Center |
| Greenland |
| ice sheets |
| NASA |
| Radar |
| Radar Altimetry |
| Satellite Radar Data |
Data Set Progress
| COMPLETE |
Data Center
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NSIDC Distributed Active Archive Center
[Information]
Data Center URL: http://nsidc.org/daac/index.html
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National Snow and Ice Data Center
[Information]
Data Center URL: http://nsidc.org Dataset ID: NSIDC-0053
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Distribution
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Distribution_Media:
CD-ROM
Distribution_Format: ASCII, binary Fees: None |
Personnel
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H.
JAY
ZWALLY Role: INVESTIGATOR Phone: 301-614-5643 Fax: 301-614-5644 Email: Jay.Zwally at nasa.gov Contact Address: Laboratory for Hydrospheric Processes NASA/Goddard Space Flight Center Code 614 City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA |
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ANITA
BRENNER Role: INVESTIGATOR Email: anita.brenner at gsfc.nasa.gov Contact Address: Laboratory for Hydrospheric Processes NASA/Goddard Space Flight Center Code 614.5 City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA |
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NSIDC
USER SERVICES Role: TECHNICAL CONTACT Phone: +1 (303) 492-6199 Fax: +1 (303) 492-2468 Email: nsidc at 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 |
Publications/References
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.
Creation and Review Dates
Last DIF Revision Date:
2011-08-01
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