数字高程模型(dem)是记录地形起伏变化的资料，当中蕴含着各种地形地貌的结构信息，其中包括山谷线和山脊线。
Digital Elevation Model (DEM) records topographic fluctuation changes and in which it contains various topographic construct information including valley lines and ridge lines.
在传统RD模型的基础上，根据不同地形特征(起伏地形和平坦地形)考虑不同的后向散射模型。
Based on the conventional RD model, different backscattering models are applied to simulation for different topographic characteristics, such as alpine terrain or flat terrain.
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