Before revision: USGS Logo Description Map produced with DLG data A digital line graph (DLG) is a cartographic map feature represented in digital vector form that is distributed by the U.S. Geological Survey (USGS).
After revision: USGS Logo Description Map produced with DLG data A Digital Line Graph (DLG) is a cartographic map feature represented in digital vector form that is distributed by the U.S. Geological Survey (USGS).