Seasat and GEOSAT Altimetry for the Antarctic and Greenland Ice Sheets
Entry ID: NSIDC-0053

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Summary
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.
Geographic Coverage
 N: 72.0 S: 60.0  E: -20.0  W: -60.0

Data Set Citation
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
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
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
NSIDC Distributed Active Archive Center    [Information]
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 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


National Snow and Ice Data Center    [Information]
Data Center URL: http://nsidc.org
Dataset ID: NSIDC-0053

Data Center Personnel
Name: NSIDC USER SERVICES
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



Distribution
Distribution_Media: CD-ROM
Distribution_Format: ASCII, binary
Fees: None


Personnel
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


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


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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