COMPARISON AMONG METHODS FOR GRAVITY DATA GRIDDING
Li Zhenhai 1) ; and Wang Haihong 1,2)
1)School of Geodesy and Geomatics, Wuhan University，Wuhan 4300792)Key Lab. of Geospace Environment and Geodesy, Ministry of Education, Wuhan University，Wuhan 430079
Abstract By using Shepard surface fitting method, weight moving trend surface fitting method and ordinary Kriging method, the anomalous gravity data were interpolated for gridding and then the gridded data results were compared with each other in calculating speed, continuity of gridded surface, the accuracy and the suitable fields of application . It is verified that: 1) the accuracy of gridding result; would become nice if the discrete data points are even in the same area and the initial data are enough; 2) the Ordinary Kriging method has the best interpolation accuracy, but calculating speed is slow, and it is suitable for great change areas; the other two methods have the fast speed, but they are suitable for little change areas.
