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。
The overlaying of the vector data above 3D terrain offers the data basis for the spatial data analysis.
矢量数据的加入为在三维地形上进行空间分析提供了可能性。
High accuracy DEMs is an important data in study of soil erosion and terrain feature space analysis.
高精度数字高程模型(DEM)是水土流失规律研究与流域地形空间分析中重要的空间数据。
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