Application Research of the Polynomial Fitting Model in Transformation of Plane Rectangular Coordinate

Since the earth is a spheroid, the coordinate systems of different countries are not the same. And because China is a vast country, many places in China also established an independent coordinate system. In the application of engineering, the transformation between different rectangular coordinate is very necessary. This paper studies the function model that polynomial fitting model of rectangular coordinate transformation, and explored the rule of impact on the accuracy that between different fitting models and the numbers of common points selected in the same model using real data. Finally, it compares the accuracy of different fitting models and finds out the optimal model, which fits the survey area.