GPS坐标向地方坐标转换的两种方法精度比较

On the precision comparison of two methods for the transformation from GPS coordinate to the local coordinate

给出了GPS坐标向地方坐标转换的两种二维平面坐标转换方法,并通过实例对两种二维坐标转换方法进行了精度比较,得出了仿射变换模型的精度高于相似变换模型的结论,指出当测区只有两个公共点时只能采用相似变换模型,当测区已知点个数不小于3时,采用仿射变换模型较好。

The paper gives two two-dimension plane methods for transformation from GPS coordinate to the local coordinate, compares the precision of the both two-dimension transformation methods according to examples, concludes the precision of the affine transformation model is higher than the one of the similitude transformation model, and points out the similitude model can be adopted when there are only two common points in measured area, while it is better to adopt the affine transformation model when the known points are no less than three.