The computation of 15° and 10° equal area block terrestrial free air gravity anomalies
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Date
1973-02
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Ohio State University. Division of Geodetic Science
Abstract
Starting with the set of 23,355 1° x 1° mean free air gravity anomalies used in Rapp (1972) to form a 5° equal area block terrestrial gravity field, this report describes the computation of 15° equal area block mean free air gravity anomalies along with estimates of their standard deviations. A new scheme of an integral division of a 15° block into 9 component 300 n. m. blocks, and each 300 n. m. block being subdivided into 25 60 n. m. blocks, is used. This insures that there is no loss-in accuracy, which would have resulted if proportional values according to area were taken of the 5° equal area anomalies to form the 15° block anomalies. A similar scheme is used for the computation of 10° equal area block mean free air gravity anomalies with estimates of their standard deviations. The scheme is general enough to be used for a 30° equal area block terrestrial gravity field, but this has not been computed in this report.
Description
Prepared for National Aeronautics and Space Administration, Goddard Space Flight Center, Greenbelt, Maryland: Grant No. NGR 36-008-161, OSURF Project No. 3210