Transportation - 8 of 12
Transportation FAQs - 12 Found
Since the 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 data as a core data set in The National Map. The USGS transportation dataset consists of roads, railroads and airport runways built from a variety of data sources. The roads are currently either from Census' TIGER/Line Shapefile source content with some updates of major roads by the USGS or from a commercial source, with some US Forest Service road data over National Forests. The railroads are sourced from Oak Ridge National Labs. The airport runways are derived from the Federal Aviation Administration location points, with polygon geometry and location updates provided by the USGS.