coordinate transforming （坐标转换），利用7参数来进行不同坐标系之间的转换。-the coordinate transforming (coordinate conversion), 7 parameters for conversion between different coordinate systems.

地理信息系统，坐标系统转换，从北京1954< >西安1980之间的转换算法，仿射，7参数-Coordinate files exchange, form beijing 1954 to xi an 1980