Monday 22 August 2005

G4

PM0026
A new global estimate of the geoid's potential value from the long term satellite altimetry observations and application of high resolution geopotential models
Ardalan, Alireza¹
1 University Of Tehran, Department of Surveying and Geomatics Eng., Iran
Author email: ardalan@ut.ac.ir
From harmonic analysis of long term satellite altimetry observations a global estimate for Mean Sea Level (MSL) is derived. Using ellipsoidal harmonic expansion derived from modern high resolution gravity field models, gravity potential of the global MSL is computed point-wise. The average value of the those potential values defines the geoid potential according to Gauss and Listing definition for geoid as an equipotential surface best fits to global MSL in least squares sense. The results of the computations based on 11 years of Topex/Poseidon satellite altimetry observations is the value 62,636,855.78±0.0131 (m2/sec2) as a new estimate for geoid potential value W0.

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