VC系统下,地球坐标转换的源代码,在WGS-84坐标和北京54坐标之间的一套转换参数,可以全国通用的，在每个地方会不一样，因为它们是两个不同的椭球基准。-VC system, the Earth coordinates conversion source code, the WGS-84 coordinates and coordinate between Beijing 54 set conversion parameters can be nationwide, in every place

基于NRO的GCRS天球坐标系与ITRS地球坐标系之间的坐标转换 -Coordinate conversion between the NRO GCRS celestial coordinate system ITRS Earth coordinate system

一个原理性的坐标转换工具。将地球看作是理想球体。适用于精度要求不是特别高的基于地理信息系统的应用。-A principle of coordinate conversion tools. Earth as a perfect sphere. Suitable for particularly high accuracy is not required based on geographic information system applications.