翻译专业测绘英语，在线翻译勿进！

Usually the data from GPS coordinates WGS - 84 system, and the geocentric coordinate system is used BJ54 coordinate our plane right-angled coordinate system, to the needs of work, we must coordinate transformation. Converting parameters has timeliness and regional public point to individual, low precision, large errors, then use before the coordinate transformation parameters calculation method is influenced by converting parameters, precision, and finally affect the quality of the construction. Therefore, the coordinate system transformation has become urban construction, national defense construction and engineering construction control using GPS technology frequently encountered problems during network. In this paper the influence factors of solving transformation parameters accuracy, through the examples, based on a study of the theory of robust estimation precision coordinate transformation calculation method to eliminate contains coarse, in public, overcome the poor public poi