区域性独立坐标系与三维地心坐标系之间的转换

new method of transformation between the three-dimension geocentric coordinate system and independent coordinate system are proposed. Compared with the conventional methods, it is not based on the 54 or 80 national reference ellipsoid. Under the technical situation nowadays, it’s easy to get the accurate geocentric coordinates on all control points with GPS. In order to transform the coordinates to the existent independent coordinate system exactly and conveniently, firstly the regional ellipsoid surface approximated to the projection plane has been adopted in this mode, and then transformation is carried out on Gauss plane. The strong point of this method is not only realizing the accurate transformation between the two coordinate systems, but also providing a complete set of transformation parameters for the whole area for the use of long term. Analogously it provides also a new simple method which can generate the transformation parameters with 3 known points in the smaller area.