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路线测量中选择平面坐标系时,地形起伏相对路线长度带来的困难较大,为有效抑制投影边长变形,需要改变坐标投影面。而变动投影面使已有控制点的坐标转换计算变得比较复杂,不仅要计算出新的椭球参数和一切计算常数,而且往往由于计算的方法不统一,产生不同的转换结果,尤其是纵坐标可能会达到亚米级的差异。为了避免出现这些问题,从理论上推导出一套既简便又严密的不同投影面间坐标换算的方法。
When selecting the plane coordinate system in the route survey, the difficulty of the relative route length of the terrain fluctuation is larger. In order to effectively suppress the deformation of the projection side length, the coordinate projection plane needs to be changed. However, the change of the projection plane makes the coordinate transformation of the existing control points more complicated, and not only the new ellipsoid parameters and all the calculation constants are calculated, but also the different conversion results often occur due to the inconsistent calculation methods, Coordinates may reach sub-meter differences. In order to avoid these problems, a set of simple and rigorous method of coordinate transformation between different projection surfaces is deduced theoretically.