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What sources of vector data were used to create base maps in The National Map?

Vector data for small scales are from The National Map Small-Scale Collection, while medium to large scales are comprised of The National Map themes, including 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 the U.S. Census Bureau's TIGER/Line data for Governmental Unit Boundaries, Structures, and Transportation.