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

Wagner, C.A.; Lerch, F.J.; Brownd, J.E.; Richardson, J.E.

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

Authors

Wagner, C.A.
External Organizations;
Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Lerch, F.J.
External Organizations;
Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Brownd, J.E.
External Organizations;
Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Richardson, J.E.
External Organizations;
Publikationen aller ICGEM-unterstützten Projekte, Deutsches GeoForschungsZentrum;

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Citation

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.

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1833995

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.