Raster data is non-geometric data defined by a grid of values covering a spatial area.
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 images can be of very huge file size, especially when the area is large.
影像档案可以很大，尤其是当影像档案详细 地覆盖广阔的面积时。
Which workflow to get polygons from a geographic area and a raster file?
工作流从一个地理区域获得多边形栅格文件？
I used clip to get a smaller raster file for a smaller area.
我用夹失掉较小的光栅文件为较小的地域。
The previous method to create framework lines of area was almost raster.
以往计算面域骨架线大多采用栅格方法。
The previous method to create framework lines of area was almost raster.
以往计算面域骨架线大多采用栅格方法。
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