Comparison of some undulation prediction techniques from altimeter data
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Date
1980-07
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Ohio State University. Division of Geodetic Science
Abstract
Adjusted Geos-3 altimeter data are used to predict and compare geoid undulations derived from two collocation models, the Bjerhammar's estimator, and Hardy's multiquadric formula. A number of tests are made in the Kerguelen Islands area, and in the Puerto Rico trench area. The results are compared in terms of the covariance function being used, the grid spacing, and the number of data points used in the prediction of a geoid undulation at a grid intersection. The correlation between the geoid undulations and the bathymetry in the Kerguelen Island area - as reported by Balmino et al. (1979) - is found in our predicted geoid maps too. At the 40 cm level, there is no difference between the use of a collocation technique, rather than the simple Bjerhammar's estimator. Furthermore, the results from the Bjerhammar's estimator agree with collocation better than the results from Hardy's Multiquadric formula.
Description
Prepared for National Oceanic and Atmospheric Administration, Rockville, Maryland: Contract No. 78-4326