Direction is a kind of important spatial relationship, it plays an important role in the process of spatial modeling, spatial query, spatial analyzing and spatial reasoning.
方向关系是一类重要的空间关系，它在空间数据建模、空间查询、空间分析、空间推理等过程中起着重要的作用。
Direction is a kind of important spatial relationship, it plays an important role in the process of spatial modeling, spatial query, spatial analyzing and spatial reasoning.
方向关系是一类重要的空间关系，它在空间数据建模、空间查询、空间分析、空间推理等过程中起着重要的作用。
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