Accuracy of the earth's gravity field models

Details Accuracy of the earth's gravity field models Accuracy of the earth's gravity field models

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pepi...31..231k&link_type=abstract

Physics of the Earth and Planetary Interiors (ISSN 0031-9201), vol. 31, March 1983, p. 231-240.

Statistics

2

Earth Gravitation, Geopotential, Gravitational Fields, Planetary Gravitation, Accuracy, Astronomical Models, Celestial Geodesy, Correlation, Error Analysis, Statistical Analysis, Variance (Statistics)

Scientific paper

A steady improvement is noted in Goddard Earth Model (GEM) gravity models with the passage of time, so that the more recent they are, the better their performance in comparative evaluation tests. The spherical harmonic coefficients of the earth's gravity field fall into distinct categories, according to the level of accuracy of their determination: 100 percent accuracy for n = 2-6, 90-99 percent for n = 7-10, 55-80 percent for n = 11-14, and less than 50 percent for n greater than 15. The results presently reported depend on the accuracy of the comparison standards, especially in the case of higher degree coefficients. Of the gravity models considered, GEM 10B is found to be the best in light of the comparison standards used.

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