Base Map - 5 of 14
Base Map FAQs - 14 Found
TNM Viewer uses a series of composite base maps to replace older vector maps. These new base maps combine layers into single cached tile services with the cartographic richness of multiple data sources. As of 2013, the following composite base maps are available:
USGS Topo - combines shaded relief, woodland and urban tint, along with vector layers, such as contours, geographic names, governmental unit boundaries, hydrography, structures, and transportation. Data sources are the National Atlas for small scales, and The National Map for medium to large scales.
USGS ImageryOnly - combines imagery from the following sources: Blue Marble from global scales through 1:1.2M; NAIP from 1:1M through 1:18K for the conterminous U.S. and Hawaii; and Landsat from 1:1M to 1:72K for Alaska, Puerto Rico, and Pacific Islands.
USGS ImageryTopo - combines the USGSImageryOnly base map with contours and other vector layers based on cartographic styling used on US Topo products.
Hydro-NHD - combines naturally occurring and constructed bodies of surface water (lakes, ponds, and reservoirs), paths through which water flows (canals, ditches, streams, and rivers), and related entities such as point features (springs, wells, stream gages, and dams) from the National Hydrography Dataset (NHD).
Hill Shade - combines shaded relief derived from the National Elevation Dataset (NED), a seamless dataset of best available raster elevation data for the conterminous U.S., Alaska, Hawaii, and Territorial Islands.
TNM Blank - combines ocean tints and coastal shorelines to provide an outline of the U.S. as a blank base map for addition of other services.
Learn more: The National Map-Service Endpoints for a complete list of service URLs.
For tips on services and future changes, please see "What's New" at: The National Map Viewer Quick Start Guide