GPS测量坐标转换实用性问题的分析

针对ＧＰＳ测量坐标转换方法中存在的问题,提出了强制符合平面四参数法和多项式拟合法,这两种方法能够有效的克服高程系统以及椭球参数不一致造成的误差,比较适合于工程自由坐标之间的转换;同时本文给出了基于“全球大地水准面的几何中心地球质心相重合”这一假设之上的莫洛金斯坐标转换法,该法不需要联测公共点即可将ＷＧＳ－８４坐标转换成本地局部坐标。上述几种方法减少了额外联测的工作量,提高了ＧＰＳ的使用效率。

A Practical Analysis on the Coordinates Transformation of GPS Surveying Result

In order to resolve the problem of the coordinates transformation between the WGS 84 and local geodetic system, in this paper, four parameter method with plane constraint and the method based on polynomial approximation are discussed. These approaches can get rid of errors come from height system unconformity and ellipsoid parameter difference in effect, and are suited for transformation between WGS 84 coordinates or local coordinates and project freedom coordinates. Meanwhile Molodensky method is given in the paper based on the hypothesis of global geoid geometry center coincided with earth centroid, This method can translate WGS 84 coordinates into local geodetic coordinates without surveying common points in the same time. All methods above mentioned reduce extra surveying work and enhance utilization ratio of Glabal Positioning System(GPS) technology.