Computer Science
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pesn.rept.....w&link_type=abstract
Unknown
Computer Science
Doppler Effect, Earth (Planet), Geoids, Geopotential, Gravity Anomalies, Sea Level, Distribution (Property), Gravimetry, Numerical Integration, Standard Deviation
Scientific paper
Various sets of gravimetric geoid undulations were completed at 600 globally distributed Doppler station sites using geopotential coefficients and different cap sizes of terrestrial gravity data. The means and standard deviations of the residuals between these gravimetric undulations and corresponding Doppler-derived geometric undulations were then computed for each set and compared. The gravimetric undulations were determined using either the OSU 81 or WGS 84 set of geopotential coefficients, each complete to degree and order 180, or a combination of the OSU 81 model truncated to degree and order 36 and terrestrial gravity data consisting of a global set of 1 deg X 1 deg mean free air anomalies. The radii of the caps containing the terrestrial data were, by design, varied from 0 deg to 65 deg. The Doppler undulations were derived by subtracting the mean sea level elevations at the stations from the Doppler-determined ellipsoid heights. The smallest standard deviations of the geoid undulation residuals were obtained when using a cap size of 6 deg. Unexpectedly, as the cap size was increased from 6 deg, increasingly larger standard deviations were produced. This basic trend remained after the global set was divided into Eastern and Western Hemispheres.
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