As an important part of GIS platform, spatial reference system includes coordinate transformation and map projection, also named as map projection transformation system.
GIS中的空间参照系统是GIS平台中的重要组成部分，内容包括各种坐标系统的转换和地图投影，故也称为投影变换系统。
The GIS software is mainly applied to the department of Geography Information system. Its coordinate system is closely related with map projection.
地理信息系统软件主要应用于地理信息系统部门，所用到的坐标系与地图投影密切相关。
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