This paper introduces the GIS space point? Line? Surface entity model based on topology data and the automatic topology model which is based on the objects model.

介绍了以拓扑关系数据为基础的GIS空间点、线、面对象实体模型，给出了基于对象实体模型的自动拓扑关系模型。

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The paper studies fuzzy characters about fuzzy geographic entities such as fuzzy point entity, fuzzy line entity and fuzzy surface entity, and discusses the representation about fuzzy entities.

对模糊地理实体的点实体、线实体和面实体的模糊性进行了研究，就它们的模糊表示进行了阐述。

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Here the three dimensional entity boundary is boundary surface mesh, which owns not only geometric property but also topology property.

此时，三维实体的“边界”是指“边界表面网格”，它既具有几何性质，又具有拓扑性质。

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