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Some Practical Issues of Upward / Downward Continuation of Gravity Gradients

Gyula Tóth(1), Lóránt Földváry(1) and Ilias N. Tziavos(2)

(1) Budapest University of Technology and Economics, Muegyetem rkp. 3. Kmf 16., H-1111 Budapest, Hungary
(2) Aristotle University of Thessaloniki, Univ. Box 440, 54 124 Thessaloniki, Greece

Abstract

The GOCE mission will produce gravity gradient data at satellite altitude and consequently contribute to more accurate determination of the gravity field. In a previous paper we discussed formulae for the upward/downward continuation problem of second gravity gradients. The proposed approach was to use these gravity gradients in two combinations with special kernel functions. These kernel functions are infinite sums of Legendre functions of orders 0, 1 and 2.

As a continuation of our previous study, several practical aspects of the proposed approach are addressed. First, the practical use of formulae in gravity field determination makes it necessary to evaluate these kernel functions in a band-limited setup. Second, the integration radius of gravity gradient data depends on the particular data combination, bandpass filter and altitude. Third, the upward/downward continuation problem can be extended to other gravity field functionals with appropriate kernel functions. These issues are investigated in the present paper in the context of GOCE.

 

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