Regional gravity field model constructed by the least squares collocation

Based on the non-uniform distribution of terrestrial gravity observation data, the reconstruction of local gravity field model is a key to the processing and interpretation of regional gravity data. In this paper, a variety of local gravity field modeling methods are compared, and the resampling data of the free air gravity anomaly model provided by the EGM2008 model are tested, and the actual effects of different modeling methods under different noise conditions are compared. The results show that the least squares collocation method is better than other ones in modeling when the covariance function suitable for gravity potential field problem is optimized at different noise levels.