Transportation - 8 of 12
Transportation FAQs - 12 Found
Since USGS is not the lead Federal agency for geospatial transportation data development, it primarily relies on data from external sources to support its requirement for transportation as a core dataset in The National Map. The USGS National Transportation Dataset consists of roads, railroads, and airport runways built from a variety of data sources. Roads are from U.S. Census Bureau TIGER/Line Shapefile source content with some updates of major roads by the USGS, along with U.S. Forest Service road data over National Forests. Railroads are sourced from Oak Ridge National Laboratory. Airport runways are derived from the Federal Aviation Administration location points, with polygon geometry and locational updates provided by USGS.