平面直角坐标转换中一个问题的研究

Research on a Problem in Plane Cartesian Coordinate Transformation

通过实例演算,分析了定义坐标系的投影参数对平面直角坐标转换的影响。得知投影参数中,影响转换结果最重要的投影参数是中央子午线,而坐标系的其它投影参数的差异对转换结果的影响很小,则不必考虑。提出了在平面直角坐标转换中,只有两套坐标系的中央子午线相同时,才可直接进行转换,有差异时,会导致转换精度大幅降低,需分步进行转换,才能保证转换精度。

The influence of the projection parameters of the defined coordinate system on the transformationof plane Cartesian coordinates is analyzed by an example.It is found that the central Meridian is the mostimportant projection parameter,and the difference of other projection parameters has little influence on theresult.It is pointed out that only when the central Meridian of two sets of coordinate systems is the same,the conversion accuracy will be greatly reduced if there is difference,and it is necessary to carry out theconversion step by step to ensure the conversion accuracy.