对常用大地坐标系间坐标转换方法的评价

常用坐标系间的相互转换对于现代工程应用有着十分重要的意义。实现坐标转换，需要若干公共已知点。然而，实际工程应用中，公共已知点的坐标信息一般难以获取，尤其是点的高程信息。针对该问题，本文利用实际数据，比较分析了在公共点无高程信息时，常用大地坐标系间坐标转换的4种方法（四参数法、多项式拟合法、高程迭代法、改化坐标法）在转换精度和其他方面的优劣。结果表明，4种方法都有着比较高的转换精度，而改化坐标法有着无需分带、单次迭代、仅需3个公共点、精度较高、精度指标一致的综合优势。

Evaluation of Coordinate Transformation Methods between Common Geodetic Coordinate Systems

The transformation between different coordinate systems is of great significance to modern engineering applications.Several common known points are needed before the transformation.However,it is difficult to obtain the coordinate information,especially the elevation information,of common known points in practical engineering applications.Aiming at this problem,four methods (four parameters method,polynomial-fitting method,height substitution circular method,transform-coordinate method) are compared and analyzed in transformation accuracy and other aspects.The data used is actual and has no elevation information.The results show that all the methods have high conversion accuracy.And the transform-coordinate method has the advantages of no zoning,only one iteration,only 3 common points,high precision and consistent accuracy index.