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Upward/downward continuation of gravity gradients for precise geoid determination

Dr. Gyula Tóth(1), Dr. Lóránt Földváry(2) , Dr. Ilias N. Tziavos(3) , and Dr. József Ádám(1)

(1) Budapest University of Technology and Economics, P.O.Box 91., H-1521 Budapest, Hungary
(2) Technical University of Munich, Arcisstraße 21., D-80333 München, Germany
(3) Aristotle University of Thessaloniki, Univ. Box 440, 54124 Thessaloniki, Greece

Abstract

The forthcoming GOCE mission will produce gravity gradient data at satellite altitude. There are different data processing strategies in order to obtain updated gravity field information from these measurements, but most of them are based on the spherical harmonic expansion of the gravity field. An alternative approach would be the direct use of the GOCE data in the space domain. In this case we need formulas for transferring gravity gradients and other gravity field information in spherical approximation between different height levels.

The upward/downward continuation problem of second vertical gravity gradients has been already solved by different authors. In this paper we discuss formulas for the other gravity gradients. The proposed approach is to use these gravity gradients in two combinations. The corresponding formulas are tested with synthetic gravity field information as well as with simulated GOCE measurements and conclusions on precise geoid determination and validation are drawn.

 

Full paper

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