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It is now possible to view global maps depicting long-wavelength and short-wavelength features of the Earth's gravity potential field, both as geoid anomalies and as free-air anomalies. This progress has resulted from (1) an increased number of surface gravity measurements, (2) orbiting of artificial satellites, (3) instal-lation of radar altimeters in three spacecraft, and (4) improved computing and display capabilities. The ratio of gravity to geoid anomalies (g/N) has been utilized to suggest a decomposition of the Earth's gravity field. The g/N ratio for each individual spherical harmonic degree is independent of the harmonic coefficient values, being determined only...

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