Digital Elevation model (DEM) is a common model of three dimension terrain, and digital analysis is mainly based on DEM.
在三维地形有关的数字分析中，地表面积是经常用到的数据。
Digital Elevation ModeI (DEM) is a common model of three dimension terrain, and digital analysis is mainly based on DEM.
数字高程模型(DEM)是一种常用的三维地形建模数据模型，三维地形的数字分析主要是针对dem模型的。
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