Thursday 25 August 2005

G2
1530-1645 hours

416
External calibration of GOCE SGG data with terrestrial gravity data
Arabelos, Dimitrios¹, Tscherning, C. Christian²
1 Department of Geodesy and Surveying, Aristotle University of Thessaloniki, Greece
2 Department of Geophysics, University of Copenhagen, Copenhagen, Denmark
Author email: arab@eng.auth.gr
Terrestrial gravity anomalies were selected from three extended continental regions, having a smooth gravity field, in order to determine the appropriate size of the area for gravity data collection as well as the required data-sampling for calibration of the GOCE satellite gravity gradient (SGG) data. Using Least Squares Collocation (LSC), prediction of gravity gradient components was carried out at points on a realistic orbit of the IAG SC7 simulated data set. Based on the mean error estimation it was shown that up to 80% of the signal of the gravity gradient components, as it is expressed through the covariance function of the terrestrial gravity data, can be recovered in the case of an optimal size of the collection area and of the optimum resolution of the data. These optimal conditions, e.g. for the Australian gravity field, correspond to a 10x12 degrees area extent and a 5' data-sampling.

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