Determination of Marine Geoid model around Japan.

Abstract

We determined the precise marine geoid model, by ”remove−restore technique” which is the gravimetric method. The long wavelength reference of CG 03 (Forste et al.,2005) which is the degree−360 expansion of the global geopotential model was removed from the local gravity anomalies which contain the ship borne gravity data observed by the Hydrographic and Oceanographic Department. The residual gravity anomalies were converted to geoid undulations using Fourier Stokes Formulas (1 D FFT) with the modified kernel. Comparison of the new marine geoid model with Geographical Survey Institute geoid model (gsigeo 2000 Ver.3.1) gives the standard deviation of 0.178 m.