A COMPARISON OF DIFFERENT DOWNWARD CONTINUATION METHODS FOR AIRBORNE GRAVITY DATA
航空重力测量数据向下延拓方法比较

We present four downward continuation methods for airborne gravity data. They are the direct representation method, Tikhonov regularization, point-mass model and the spherical interior Dirichlet's harmonic solution method. The downward continuation computation for real airborne gravity data in the Datong region of China is performed by means of these methods. The accuracy, reliability and stability of different methods are evaluated based on respect to the comparison and analysis of downward continued results with terrestrial real gravity data. The numerical computations indicate that results obtained by using the first and second methods are more accurate and stable than using the third and fourth methods.