Fusion the Altimetric and Shipborne Gravity Data Based on Point Mass Fit Method

doi:10.11947/j.AGCS.2018.20170299

Abstract

Abstract: Using the point mass fit method, the position, size and other parameters of the point mass source are inversed by fitting the shipborne gravity anomaly data with the minimum variance between the point mass model and observed value.Avoiding the instability posed by the point mass method, the shipborne residual gravity anomalies are calculated by using these parameters based on the idea of remove-restore technique.Shipborne gravity residuals can be obtained by minusing the gravity anomaly in the track line.The altimetric residual gravity data are also obtained by using the similar method.Weighted the two residual gravity anomaly by the minimum curvature gridding method, and restored the model gravity anomaly calculated by the point mass size, depth and other parameters, then realized the satellite altimetry and shipborne gravity data fusion.The mean bias is 1~2 mGal and the root mean square is about 4 mGal, which is verified by the international shipborne gravity measurement data.The proposed method can be used as a reference for processing the various gravity data fusion in coastal zone and for satellite gravity downward continuation problem.

Key words: point mass, altimetry, shipborne gravity, data fusion

CLC Number:

P223

KE Baogui, ZHANG Liming, ZHANG Chuanyin, DANG Yamin. Fusion the Altimetric and Shipborne Gravity Data Based on Point Mass Fit Method[J]. Acta Geodaetica et Cartographica Sinica, 2018, 47(7): 924-929.

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