Source - http://www.dnr.sc.gov/GIS/descdlg.html
DLG or also known as digital line graphs use the U.S. geological survey which provide all the boundaries, transportation, hydrography and hypsography. DLG also use different scales large , intermediate and small. This map above is a prime example of a DL, it is a region in South Carolina called Beaufort. It uses lines and boundaries to indicate where roads and body of water are through out the region.
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