However, the spatial data model of main GIS systems only reflect knowledge of management and manipulation objects in field of cartography, such as point, line and poly geometry objects.
当今的GIS系统的空间数据模型，主要反映地图制图领域的点、线、面对象管理与操作的几何知识。
However, the spatial data model of main GIS systems only reflect knowledge of management and manipulation objects in field of cartography, such as point, line and poly geometry objects.
当今的GIS系统的空间数据模型，主要反映地图制图领域的点、线、面对象管理与操作的几何知识。
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