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dem格式编码高程数据来创建高清晰地形。
The DEM format encodes elevation data to create highly detailed terrains.
以水准点高程数据变化说明地面沉降历史现状。
Historical actuality of ground settlement is explained Using changes of benchmark height data.
高程数据就是很好的单级光栅数据的例子，它经常用颜色坡度，如图2所示。
Elevation data is a good example of a single-band raster dataset, often visualized with a color ramp, as shown in Figure 2.
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