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Tikhonov regularization is introduced into the point-mass method to solve the ill-posed problem in fusion processing of multi-source gravity data. A point-mass model is regularized, and a modified regularization point-mass model is proposed. Finally, a sea-borne gravity data set and an airborne gravity data set from EGM2008 model are used as a case study to test the efficiency of regularization point-mass. Results show that the modified method can inhibit the amplifying effect of measurement errors due to the small singular values of ill-posed coefficient matrix, and thus improve the precision and stability of point-mass solutions. [ABSTRACT FROM AUTHOR]

Two practical downward continuation methods are proposed for the sea surveying areas in accordance with their gravity characteristics and available information addressing the uncertainty of downward continuation for airborne gravity data. In the first method, the continuation corrections are calculated by using the upward continuation of satellite gravity data, and in the other, by using EGM2008 gravity field model. A satellite gravity data set, two sea-borne gravity data sets, and an airborne gravity data set are used as a case study to test the efficiency of these new methods. [ABSTRACT FROM AUTHOR]