Research on coordinate transformation model considering the spatial distribution of control points

To guarantee the accuracy of coordinate transformation, a coordinate transformation model was studied through selecting the proper coincident points based on the spatial distribution of control points. With the models to describe the uniformity and density of control points set up, the influence of uniformity and density of coincident points on the accuracy of coordinate transformation model was discussed. A coordinate transformation model was constructed with the spatial distribution of control points taken into account, and the coordinate transformation process between the local coordinate system and CGCS2000 was discussed. At last, the effectiveness of the new model was verified with examples.