Choosinga map coordinate system 选择的图片投影系统
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。
At last, this paper narrates several issues, they are conversion of data structure, conversion of coordinate system, cutting out and disparting of map, the management of layer and applied calculation.
最后简单说明了数据结构转换、坐标系转换、图形裁剪与分幅、图层管理以及应用计算等功能。
The Beijing coordinate system in 1954 and the Xi 'an coordinate system in 1980 are two kinds of coordinate systems kept in the map document presently in China.
1954年北京坐标系和1980西安坐标系是我国目前地图资料中存在的二种坐标系统。
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