A Global 1 deg x 1 deg Anomaly Field Combining Satellite, Geos-3 Altimeter and Terrestrial Anomaly Data.

Abstract
This report describes a method for combining satellite derived potential coefficients, mean 1 deg x 1 deg anomalies derived from The GEOS-3 altimeter data, and mean 1 deg x 1 deg anomalies estimated from terrestrial gravity data. The combination procedure is designed to obtain an adjusted set of potential coefficients and an adjusted set of 64800 1 deg x 1 deg mean anomalies. The adjusted anomalies can be developed into potential coefficients to as large a degree as is reasonable considering the 1 deg x 1 deg data. Such anomalies will be exactly consistent with the adjusted potential coefficients. The method was applied using the GEM 9 potential coefficients, 28176 1 deg x 1 deg anomalies derived from the Geos-3 altimeter data, and 22474 terrestrial anomalies. The potential coefficients were adjusted to degree 12 with the adjusted anomalies being developed into potential coefficients to degree 60. Higher degree solutions in the adjustment process are possible but the computer time needed is quite large. (Author)

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