坐标转换是空间实体的位置描述，是从一种坐标系统变换到另一种坐标系统的过程。通过建立两个坐标系统之间一一对应关系来实现。(Coordinate transformation is the location descr iption of spatial entities, which is the process of transforming from one coordinate system to another. Through the establishment of one-to-on