Valley extraction based on a regular DEM grid is an important method for terrain analyzing.

基于规则数字高程模型格网的峡谷检测是地形特征分析的重要手段。

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DEM (Digital elevation Model) is a data set of plane coordinate or longitude, latitude, and elevation of the regular square grid points in some region.

数字高程模型(DEM)是一定区域范围内规则格网点的平面坐标及其高程的数据集或者是经、纬度和海拔高度的数据集。

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