http://pubs.usgs.gov/of/2003/of03-471/domier/index.html
DLG stands for digital line graphs, which is a type of graph that is georectified. This DLG shows different variations according to lines being closer or further apart. It shows a park, gravel, roads, tanks, a sewer dispenser, and hills. These are helpful in displaying the different types of things in an area to see what else can be placed in the particular area.
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