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.

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该算法按照空间相邻关系，将空间相邻的空间目标聚类成一类。

The algorithm clusters neighboring spatial objects to a cluster on the neighborhood relation in spatial.

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其中基础类包是应用类包和组合类包的基础，它用点、线、面、体、复杂对象和关系类等基本的要素表示三维空间。

The base package including point class, line class, area class, volume class, complex object class and relation class, is the base of the application package and the combination package.

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