Détermination de l’exactitude d’un géoïde gravimétrique

Abstract : The determination of a geoid model with a centemetric precision is one of the main interests of several research groups. One of the most used methods in use to calculate a geoid model is the Remove-Compute-Restor procedure using the residual terrain model. This threestep method combine the information at different wavelength frequency using the integration of Stokes. At each step, we mention the error sources and its influence over the precision of calculated geoid. We are mainly interested in the terrain correction at the first step (the remove) and in the estimation of the precision of the Stokes’ integration at the second step (the compute). The terrain correction removes the high frequencies of the gravimetric signal by using a calculation procedure in the frame of the Remove-Restore procedure. We perform our tests on the different parameters to choose its values corresponding to a precision of 1 cm especially the small and large radii and the influence of the DTM resolution. We study also the step of Stokes’ integration using the standard Srokes’ function. The parameters of this phase are studied by generating synthetic data from EGM2008. We estimate the precision of Stokes’s integral at different landscapes.
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Zahra Ismail. Détermination de l’exactitude d’un géoïde gravimétrique. Astrophysique [astro-ph]. PSL Research University, 2016. Français. ⟨NNT : 2016PSLEO002⟩. ⟨tel-01431701⟩



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