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A wavelet based representation of the gravity field.

Isabelle Panet(1), Michel Diament(2) , and Olivier Jamet(3)

(1) IPGP/IGN, Case 89, 4 place JUSSIEU, 75252 Paris cedex05, France
(2) IPGP, Case 89, 4 place JUSSIEU, 75252 Paris cedex05, France
(3) IGN, ENSG, 6 et 8,avenue Blaise-Pascal,Cit é Descartes, 77455 MARNE-LA-VALLÉE Cedex 2, France

Abstract

GOCE will provide an unprecedented knowledge of the earth gravity field that will allow to realize geodynamic studies at various scales, ranging from the entire globe to the “local” scale. However in order to carry on this “local” studies it will be necessary to mix GOCE data with other ones, namely surface or airborne data in order to improve the short wavelengths resolution of the gravity anomalies that have to be interpreted for geodynamic purposes. For that aim, we developed a representation of the gravity field based on wavelets instead of the classically used spherical harmonics. We first tested several different bases, namely Shannon, De La Vallée Poussin and Abel-Poisson. We carried out our tests on the entire globe as on limited areas. We tested “perfect” data and noisy ones and we also investigated the possible effects of data distribution, from homogeneous distribution to very inhomogeneous ones. We present and discuss here our results that appear to be most promising.

 

Workshop poster

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry

GOCE04