On Spatial Extension Processing of Near Shore Shipborne Gravity Data

In view of coastal region offshore range from 5km to 30km, the present situation of shipborne gravity measurement data is blank. Based on the existing data, a resampling method is proposed to determine the optimal resampling space distance. Using the lagrange interpolation algorithm, the data of the direction along the survey line are extended to the land by 5-10km,and thereby filling the data gap in the inshore area. The results of this study can serve as a basis for land and ocean consistent datum construction.