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Regional solutions from GOCE orbit information and gradiometry measurements considering topographic-isostatic models

Annette Eicker(1), Atef Makhloof(1), Torsten Mayer-Gürr(1) and Karl-Heinz Ilk(1)

(1) University of Bonn, Nussallee 17, 53115 Bonn, Germany

Abstract

The satellite mission GOCE promises an improvement of the static gravity field with unprecedented accuracy and resolution. To exploit the signal information present in the satellite and sensor data to full content, it seems reasonable to improve global solutions by regional recovery strategies. Especially in the high frequency part of the spectrum the gravity field features differ in different geographical areas. Therefore the recovery procedure should be adapted according to the characteristics in the respective area. For the GOCE mission this aspect is of particular interest due to its strength in recovering the high resolution part of the gravity field. In the approach presented here in a first step a global gravity field represented by a spherical harmonic expansion up to a moderate degree has to be derived from a combination of orbit information and gradiometry measurements. It is then refined by regionally adapted high resolution refinements being parameterized by splines as space localizing base functions. To smooth the signal and to simplify the downward continuation process, information originating from topographic-isostatic models is subtracted from the data according to a remove-restore step. Additionally in a last step those tailored regional solutions are merged to a global representation, from which a parameterization by global base functions such as spherical harmonics can be derived by means of quadrature methods as well. The approach is demonstrated by a simulation example.

 

Workshop presentation

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