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  Improvement in the Geopotential Derived from Satellite and Surface Data (GEM 7 and 8)

Wagner, C., Lerch, F., Brownd, J., Richardson, J. (1976): Improvement in the Geopotential Derived from Satellite and Surface Data (GEM 7 and 8), (NASA Technical Reports), Greenbelt, Md : GSFC Goddard Space Flight Center, 11 p.

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1833995 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1833995_3
Genre: Report

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 Creators:
Wagner, C.A.1, 2, Author
Lerch, F.J.1, 2, Author
Brownd, J.E.1, 2, Author
Richardson, J.E.1, 2, Author
Affiliations:
1External Organizations, ou_persistent22              
2Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum, , , ou_1684888              

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 Abstract: A refinement was obtained in the earth's gravitational field using satellite and surface data. In addition to a more complete treatment of data previously employed on 27 satellites, the new satellite solution (Goddard Earth Model 7) includes 64,000 laser measurements taken on 7 satellites during the international satellite geodesy experiment (ISAGEX) program. The GEM 7, containing 400 harmonic terms, is complete through degree and order 16. The companion solution GEM 8 combines the same satellite data as in GEM 7 with surface gravimetry over 39% of the earth. The GEM 8 is complete to degree and order 25. Extensive tests on data independent of the solution show that the undulation of the geoidal surface computed by GEM 7 has an accuracy of about 3m (rms). The overall accuracy of the geoid estimated by GEM 8 is estimated to be about 4-1/4m (rms), an improvement of almost 1m over previous solutions.

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 Dates: 1976
 Publication Status: Finally published
 Pages: 11
 Publishing info: Greenbelt, Md : GSFC Goddard Space Flight Center
 Table of Contents: -
 Rev. Type: -
 Identifiers: Other: X-921-76-20
URI: http://ntrs.nasa.gov/search.jsp?R=19760013659
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Title: NASA Technical Reports
Source Genre: Series
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: Report Nr.: X-921-76-20