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？
应用推荐