改系统由国家测绘局大地测量数据处理中心，能将经纬度坐标方便地转换为北京54平面坐标系，对GIS开发者十分有帮助
Change the system by the State Bureau of Surveying and Mapping Geodetic Data Processing Center, latitude and longitude coordinates can be easily converted to Beijing 54 plane coordinate system for GIS developers very helpful (2007-10-10, DOS, 297KB, 下载38次)