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By means of GIS method, the digital elevation model(DEM)is established, the subcatchment boundaries are studied.

利用 GIS 方法建立了数字高程模型（DEM），研究了子汇水面积的边界。

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For example, Digital Elevation Model (DEM) data points are equally arranged in a grid pattern.

例如，数字高程模型(Digital Elevation Model, DEM)数据点在网格图形中均匀排列。

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This digital elevation model (DEM) will be put to myriad uses - everything from improving the safety of aircraft navigation to understanding better which areas of ground are most at risk during a flood.

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