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GOCE GRADIENTS VALIDATION BY THE AIRBORNE GRADIOMETER AND GRACE MEASUREMETS.

Prof. Janusz Zielinski(1)and Prof. Jan Latka(1)

(1) Space Research Centre, Polish Academy of Sciences, ul. Bartycka 18A, 00-716 Warsaw, Poland

Abstract

Validation of the GOCE gravity gradient product by comparison with measurements on low and high altitudes is discussed. As the low altitude case we can consider the application of the airborne gradiometer flying at the altitude of 40 - 30 km on the board of a stratospheric balloon. The measurements can be compared with satellite data. The post-mission validation is possible more directly than through the comparison with the ground truth gravity anomalies or geoid undulation. The low flying gradiometer is less sensitive, but thanks to the altitude difference, compatible in precision with the orbiting GOCE gradiometer. The high altitude data are generated by simulation of the GRACE mission converted to gravity gradients. It is interesting in particular for the middle part of the spectrum of the gravity field. Two procedures of the downward/upward continuation are presented: the least squares collocation and the Upward Continuation with the Reference Model. Comparison of these two methods shows some advantages and disadvantages of each of them. Numerical tests are presented using data simulated by the IAG Special Study Group "Gravity Field Missions".

 

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