DLG stands for digital line graph. This is a cartographic map feature represented in a digital vector form and is distributed by the USGS. The above picture is a subset of the United States a shows a reduced resolution in order to provide an adequate proportion. Raw elevation shading techniques depict white as state, country and coast outlines. Gray as counties. Black represents rivers and major streams while red is US highways. Lighter red is for interstates and magenta shows national parks and monuments.
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