空间数据是对现实世界地理实体的抽象。
Spatial data is the abstract of geographical entity in the real world.
与二维GIS相比，三维GIS对客观世界的表达能给人以更真实的感受，它以立体造型技术给用户展现地理空间现象。
Compared to the two-dimension GIS, the three-dimension GIS can give people the more true feeling of the external world. It displays the geographic space phenomenon by solid sculpt technology.
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