This is the spatial data model which is proposed by OGC.
第四个是统一空间数据模型。
The aim of establishing spatial data model is to reflect the real world.
空间数据模型建立的目的是反映现实世界。
The type of spatial data model: the model based on object (element); network model; field model.
空间数据模型的类型：基于对象(要素)的模型；网络模型；场模型。
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