数字地形模型(DEM)包含着丰富的地形、地貌及相关的地学信息与知识，是GIS数字地形分析的数据基础。
As the data base of the GIS digital terrain analysis, digital Elevation Model (DEM) contains rich of terrain, topography and related geo-information and knowledge.
数字地形模型(DEM)包含着丰富的地形、地貌及相关的地学信息与知识，是GIS数字地形分析的数据基础。
As the data base of the GIS digital terrain analysis, digital Elevation Model (DEM) contains rich of terrain, topography and related geo-information and knowledge.
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