Entry_ID: NSIDC-0053
Entry_Title: Seasat and GEOSAT Altimetry for the Antarctic and Greenland Ice Sheets
Group: 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
End_Group
Group: Personnel
   Role: Investigator
   First_Name: H. Jay
   Last_Name: Zwally
   Email: Jay.Zwally@nasa.gov
   Phone: 1 301 614-5643 
   Fax: 1 301  614-5644 
   Group: Contact_Address
      Address: NASA/Goddard Space Flight Center
      Address: Laboratory for Hydrospheric Processes
      Address: Laboratory for Hydrospheric Processes
      Address: NASA/Goddard Space Flight Center
      Address: Code 971
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Anita
   Last_Name: Brenner
   Email: anita.brenner@gsfc.nasa.gov
   Group: Contact_Address
      Address: NASA/Goddard Space Flight Center
      Address: SSAI
      Address: Code 614.5
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Technical Contact
   First_Name: NSIDC
   Last_Name: User Services
   Email: nsidc@nsidc.org
   Phone: 1 303 492-6199 x
   Fax: 1 303  492-2468 x
   Group: Contact_Address
      Address: National Snow and Ice Data Center
      Address: CIRES, 449 UCB
      Address: University of Colorado
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309-0449
      Country: USA
   End_Group
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Glacier Elevation/Ice Sheet Elevation
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Ice Sheets
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Glacier Elevation/Ice Sheet Elevation
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Ice Sheets
End_Group
Keyword: Altimetry
Keyword: Antarctic
Keyword: Goddard Space Flight Center
Keyword: Greenland
Keyword: ice sheets
Keyword: NASA
Keyword: Radar
Keyword: Radar Altimetry
Keyword: Satellite Radar Data
Sensor_Name: RADAR ALTIMETERS
Source_Name: GEOSAT > Geodetic Satellite
Source_Name: SEASAT > Ocean Dynamics Satellite
Group: Temporal_Coverage
   Start_Date: 1978-06-01
   Stop_Date: 1986-09-30
End_Group
Data_Set_Progress: complete
Group: Spatial_Coverage
   Southernmost_Latitude: 60
   Northernmost_Latitude: 72
   Westernmost_Longitude: -60
   Easternmost_Longitude: -20
End_Group
Group: Location
   Location_Category: CONTINENT
   Location_Type: ANTARCTICA
End_Group
Group: Location
   Location_Category: CONTINENT
   Location_Type: NORTH AMERICA
   Location_Subregion1: GREENLAND
End_Group
Project: EOSDIS > Earth Observing System Data Information System
Project: ESIP > Earth Science Information Partners Program
Data_Set_Language: English
Group: Data_Center
   Data_Center_Name: NASA DAAC > NASA DAAC at the National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org/daac/index.html
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Data_Center
   Data_Center_Name: NSIDC > National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Format: Binary
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Format: ASCII Text (.txt)
End_Group
Group: 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.

End_Group
Group: 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. End_Group Group: Related_URL Group: URL_Content_Type Type: VIEW RELATED INFORMATION End_Group URL: http://nsidc.org/data/dems/index.html Description: Polar Ice Sheet DEMs and Elevation Data End_Group IDN_Node: USA/NASA Metadata_Name: CEOS IDN DIF Metadata_Version: 9.7 DIF_Creation_Date: 1997-01-01 Last_DIF_Revision_Date: 2012-07-26 DIF_Revision_History: added creators and hanged CD-ROM to FTP in dist. media per note on catalog page