U.S. Geological Survey, 2015, USGS TNM topo base map: U.S. Geological Survey, https://basemap.nationalmap.gov/arcgis/rest/services/USGSTopo/MapServer.
USGS Topo is a tile cache base map service that combines the most current data in The National Map (TNM), and other public-domain data, into a multi-scale topographic reference map. Data themes included are Boundaries, Geographic Names, Transportation, Contours, Hydrography, Land Cover, Shaded Relief, and Bathymetry. This service is designed to provide a seamless view of TNM data in a geographic information system (GIS) accessible format.
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