External calibration of GOCE data using regional terrestrial gravity data

:This paper reports on a study of the methodology of external calibration of GOCE data, using regional terrestrial-gravity data. Three regions around the world are selected in the numerical experiments. The result indicates that this calibration method is feasible. The effect is best with an accuracy of scale factor at 10− 2 level, in Australia, where the area is smooth and the gravity data points are dense. The accuracy is one order of magnitude lower in both Canada where the area is smooth but the data points are sparse, and Norway, where the area is rather tough and the data points are sparse.