Apparently, spatial operation is a very important part of GIS.
显然，空间运算是GIS系统相当重要的部分。
Overlap analysis is a widely used spatial operation for the needs of spatial analysis in GIS.
叠置分析是GIS进行空间分析时常用的一种空间操作。
The amended GTP model synthesized the merits of tin, GTP and tetrahedron, and its constructing algorithm was simple and the spatial operation on it is seamless.
修正后的GTP模型集成了TIN, GTP和四面体模型的优点，构建算法简单且空间操作无缝。
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