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Improvement in the geopotential derived from satellite and surface data (GEM 7 and 8)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.
Document ID
19760013659
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Wagner, C. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lerch, F. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Brownd, J. E. (Computer Sci. Corp. Silver Spring, Md., United States)
Richardson, J. A. (Computer Sci. Corp. Silver Spring, Md., United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1976
Subject Category
Geophysics
Report/Patent Number
NASA-TM-X-71088
X-921-76-20
Accession Number
76N20747
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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