第四个是统一空间数据模型。
空间数据模型建立的目的是反映现实世界。
The aim of establishing spatial data model is to reflect the real world.
空间数据模型是地理信息系统设计的核心和基础。
Spatial data model is the core and base of three dimensional geographic information system design.
因此，设计并创建空间数据库数据模型显得尤为重要。
Therefore, it is especially important to design and establish the data model for spatial database.
因此，设计并创建空间数据库数据模型显得尤为重要。
Therefore, it is especially important to design and establish the data model for spatial database.
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