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The USGS Transportation service from The National Map (TNM) is based on TIGER/Line data provided through U.S. Census Bureau and road data from U.S. Forest Service. Some of the TIGER/Line data includes limited corrections done by USGS. Transportation data consists of roads, railroads, trails, airports, and other features associated with the transport of people or commerce. The data include the name or route designator, classification, and location. Transportation data support general mapping and geographic information system technology analysis for applications such as traffic safety, congestion mitigation, disaster planning, and emergency response. The National Map transportation data is commonly combined with other data themes, such as boundaries, elevation, hydrography, and structures, to produce general reference base maps. The National Map download client allows free downloads of public domain transportation data in either Esri File Geodatabase or Shapefile formats. For additional information on the transportation data model, go to http://nationalmap.gov/transport.html.
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USGS The National Map: National Transportation Dataset; U.S. Census Bureau – TIGER/Line; U.S. Forest Service
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Title: USGS TNM Transportation
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Author: U. S. Geological Survey - National Geospatial Program
Comments: See http://viewer.nationalmap.gov/help for assistance with The National Map viewer, download client, services, or metadata.
Keywords: transportation,road,railroad,airport,airstrip,runway,ferry,tunnel,interstate,expressway,controlled-access,highway,ramp,route,primary,secondary,local,connector,4WD,trail,scenic,recreational,USFS,United States,US,NGP-TNM,REST,WMS,WFS
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