reference system
英 美
The ellipsoid model is the first part of a spatial reference system definition.
椭圆体模型是空间引用系统定义的第一部分。
We'll also touch on the Military Grid reference system (MGRS), which is based on UTM.
我们还要提到以utm为基础的军事格网参考系(MGRS)。
The second is that ArcExplorer requires all spatial columns to have a single spatial reference system assigned.
第二件事情是 ArcExplorer 要求所有空间列指定一个空间引用系统。