Research and Engineering Practice of GPS River-Crossing Leveling Fitting Method

A method of GPS river-crossing leveling fitting is introduced in this paper. The normal height difference of two points across the river can be worked out by GPS height difference and abnormal height difference fitted by BP neural network. By testing the BP neural network in a project example,when choose the better neural network structure and suitable training function and input coordinate inference and GPS height difference,the normal height difference of the two points can be worked out. And results show that this method can obtain good accuracy.