The earth's gravity field to degree and order 180 using SEASAT altimeter data, terrestrial gravity data, and other data

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1981-12

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Ohio State University. Division of Geodetic Science

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The spherical harmonic expansion of the earth's gravitational field has been obtained to degree 180 by combining several sources of data. The first data set was an a priori set of potential coefficients to degree 36 based on a number of recent solutions including a substantial number of resonance terms. A second data set was a 1° x 1° anomaly field derived from the Seasat data set, while the third data set was an updated 1° x 1° terrestrial field. The last two fields were combined into one set containing 56761 1° x 1° values. The remaining values were computed from the a priori potential coefficients. A rigorous combination solution was not carried out. Instead all anomalies were weighted in such a way that the normal equations were diagonal. The results of the adjustment were 64800 1° x 1° anomalies that were expanded into spherical harmonics using the optimum quadrature procedures developed by Colombo. Accuracy estimates for each coefficient were obtained considering noise propagation and sampling error caused by the finite block size (1° x 1°) in which the anomalies are given. The percentage error of the solution reaches 100% near degree 120. The coefficients and their accuracy to degree 50 are listed in an appendix and the complete set is available on tape. The coefficients have been compared to other coefficient sets such as GEM10C and GRIM3.

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