光栅数据 是由覆盖空间区域的网格值所定义的非几何数据。
Raster data is non-geometric data defined by a grid of values covering a spatial area.
光栅数据的层通常称为段，而术语层仍然用于光栅和矢量数据。
Layers of raster data are more often called bands, although the term layer still applies to raster as well as vector 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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