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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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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。

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