NSIDC-0053_1

Seasat and GEOSAT Altimetry for the Antarctic and Greenland Ice Sheets, Version 1

Version 1 eng; usa
  • Abstract

    Note: This data set is now on FTP so references to CD-ROM are historic and no longer applicable.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

Data Identification Fields:

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    Processing Level

    Level 3

    Quality
    Collection Progress

    Complete

Related URLs
    Science Keywords
    • EARTH SCIENCE
    • Terrestrial Hydrosphere
    • Glaciers/Ice Sheets
    • Glacier Elevation/Ice Sheet Elevation
    • EARTH SCIENCE
    • Cryosphere
    • Glaciers/Ice Sheets
    • Glacier Elevation/Ice Sheet Elevation
    • EARTH SCIENCE
    • Terrestrial Hydrosphere
    • Glaciers/Ice Sheets
    • Ice Sheets
    • EARTH SCIENCE
    • Cryosphere
    • Glaciers/Ice Sheets
    • Ice Sheets

Acquisition Information Fields:

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Platforms
  • Satellite
    GEOSAT
    Instruments
    • RADAR ALTIMETERS
  • Satellite
    SEASAT
    Instruments
    • RADAR ALTIMETERS

Temporal Information Fields:

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Spatial Information Fields:

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    Coverage Type Zone Identifier Geometry Granule Representation
    HORIZONTAL CARTESIAN GEODETIC
Location Keywords
    • Continent
    • North America
    • Greenland
    • Continent
    • Antarctica

Data Centers

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  • National Snow and Ice Data Center
    ARCHIVER

    National Snow and Ice Data Center
    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email
  • National Snow and Ice Data Center
    DISTRIBUTOR

    National Snow and Ice Data Center
    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email

Data Contacts

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  • H.
    Technical Contact
    H. Zwally

    Laboratory for Hydrospheric Processes
    NASA/Goddard Space Flight Center
    Code 971
    Greenbelt, MD 20771

    • 1 301 614 5643
    • 1 301 614 5644
    • Email
  • Anita
    Technical Contact
    Anita Brenner

    Code 614.5
    Greenbelt, MD 20771

  • Zwally,
    Technical Contact
    Zwally, Brenner

    This contact does not have any addresses listed.

    This contact does not have any contact mechanisms listed.

  • National Snow and Ice Data Center
    User Services
    National Snow and Ice Data Center

    Boulder, Colorado

    This contact does not have any contact mechanisms listed.

  • NSIDC
    Data Center Contact
    NSIDC Services

    National Snow and Ice Data Center

    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email
  • NSIDC
    Data Center Contact
    NSIDC Services

    National Snow and Ice Data Center

    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email

Collection Citations Fields:

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    Collection Citations
    • Seasat and GEOSAT Altimetry for the Antarctic and Greenland Ice Sheets, Version 1
      1

      Published by: National Snow and Ice Data Center