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Base Map FAQs - 14 Found
Vector data for small scales are from the National Atlas, while medium to large scales are comprised of all of The National Map themes, to include the National Hydrography Dataset (NHD) and Geographic Names Information System (GNIS) data. Other medium to large scale vector features are from USGS edited versions of U.S. Census Bureau data for Governmental Unit Boundaries, Structures, and Transportation. Commercial source roads were used as a supplement for additional features in Transportation.