几种常用平面直角坐标系与国家统一3°带坐标系转换原理、方法

摘要

Local plane rectangular coordinate system with which the length deformation is not greater than 2.5cm/km is needed to be established, because in large scale mapping , when Survey area is far away from the central meridian of National unity 3°zone coordi-nate system or the elevation of Survey area is large , National unity 3°zone coordinate system couldn’ t satisfy the needs of urban con-struction and engineering construction .Local plane rectangular coordinate system is transformed from National unity 3°coordinate sys-tem, this paper did research on several common principles and methods of coordinate transformation between plane rectangular coordi -nate system and national 3°zone coordinate system .%开展大比例尺测图时，当测区距离国家统一3°带中央子午线较远或测区高程较大时，国家统一3°带坐标系不能满足城市建设和工程建设的需要，需要建立长度变形值不大于2．5 cmk／m 的地方平面直角坐标系。地方平面直角坐标系是国家统一3°带平面直角坐标系的变换，本文研究几种常用地方平面直角坐标系与国家统一3°带坐标系相互转换的原理与方法。