Geodetic Use of GEOSAT-A.
Final rept. 16 Sep 82-30 Aug 83,
MATHEMATICAL GEOSCIENCES INC LEXINGTON MA
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The molodensky Integral can be used to compute gravity anomalies from the geoid height. There are two error sources. The error due to limiting the integral to a spherical cap can, in practice, be reduced by using a low degree and order reference field. For example, with a 6 degree radius cap and a 12th degree and order reference geopotential this error is one milligal. The error due to the geoid height error depends on the gravity anomaly block size and variance of the geoid height error. In this case, a 3 cm rms geoid error will result in a one milligal error for a 28km x 28 km mean gravity anomaly. Quantitization error of replacing the integral by a summation and the singularity of the Molodensky Kernel are found to contribute in significant errors. The correction for satellite to sea surface altitude measurements due to the wet troposphere hw is investigated using Scanning Multichannel Microwave Radiometer SMMR data from SEASAT-1. The Mesoscale Eddy field is discussed, and is shown to contribute 8 to 25 cm rms noise to the mean sea surface.