1.Then the synoptical conversion parameter is calculated by control coordinates and photogrammetric coordinates of three control points.
由控制点的已知控制坐标与求得的摄站坐标系下的坐标，进一步求得两坐标系的转换参数的初值；
2.Then the synoptical conversion parameter is calculated by control coordinates and photogrammetric coordinates of three control points.