This paper discussed the topologic relationship of spacial data and gave an exact description of map graphic elements.
本文讨论了空间数据的拓扑关系，对地图的基本图形元素作了更准确的表述；
This paper discussed the topologic relationship of spacial data and gave an exact description of map graphic elements.
本文讨论了空间数据的拓扑关系，对地图的基本图形元素作了更准确的表述；
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