COMPARISONS OF GRAVIMETRIC GEOID RESULTS USING MEAN GRAVITY ANOMALIES AND POTENTIAL COEFFICIENTS IN THE SOUTH AUSTRALIAN REGION
- 1 January 1985
- journal article
- research article
- Published by Taylor & Francis in Survey Review
- Vol. 28 (215) , 41-46
- https://doi.org/10.1179/003962685791475314
Abstract
Gravimetric geoid separation values derived using mean gravity anomalies in the usual Stokes integration are compared with values obtained using a combined solution of the Stokes integration with the Molodenskii truncation procedure. Mean gravity anomalies were obtained from surface gravity data for the near zones and the Rapp (1977, 1978) l° × 1° and 5° equal area mean anomalies were used for the outer zones in the Stokes integration. The potential coefficients required in the Molodenskii truncation were obtained from GEM-lOB data. Using two values of the radius of the spherical cap represented by the Stokes integration in the combined solution (ψ0 = 5° and 0°) the comparisons are made at 110 one degree geographical grid points situated in South Australia. The results show in both cases a systematic mean difference of approximately 0.5 m with RMS's about this mean for ψ0 = 5° and 0° of 0.6 m and 1.8 m respectively.Keywords
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