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The indirect effects on the computation of geoid undulationsThe indirect effects on the geoid computation due to the second method of Helmert's condensation were studied. when Helmert's anomalies are used in Stokes's equation, there are three types of corrections to the free air geoid. The first correction, the indirect effect on geoid undulation due to the potential change in Helmert's reduction, had a maximum value of 0.51 meters in the test area covering the United States. The second correction, the attraction change effect on geoid undulation, had a maximum value of 9.50 meters when the 10 deg cap was used in Stokes' equation. The last correction, the secondary indirect effect on geoid undulatin, was found negligible in the test area. The corrections were applied to uncorrected free air geoid undulations at 65 Doppler stations in the test area and compared with the Doppler undulations. Based on the assumption that the Doppler coordinate system has a z shift of 4 meters with respect to the geocenter, these comparisons showed that the corrections presented in this study yielded improved values of gravimetric undulations.
Document ID
19830016735
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Wichiencharoen, C. (Ohio State Univ. Columbus, OH, United States)
Date Acquired
September 4, 2013
Publication Date
December 1, 1982
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NAS 1.26:170347
REPT-336
NASA-CR-170347
Accession Number
83N25006
Funding Number(s)
CONTRACT_GRANT: NGR-36-008-161
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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