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The USGS provides the mapping and digital geospatial foundation for the Nation.

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The National Map Viewer Interface
To be compatible with other popular viewers, tiled base maps were cached using tiles that are 256x256 pixels in tile size and 96 DPI resolution, at global scale through 1:9,000. The cache is composed of over 1 billion tiles, and takes over 30 days to regenerate.
Mercator the Man
The projection used for all tiled base map services is the WGS84 Web Mercator (Auxiliary Sphere) so base map services can be used in combination with other common viewers, such as Google Maps and Microsoft Bing Maps.  For more info: see Spatial Reference SR-ORG:6928 and Spatial Reference SR-ORG:7483/. Dynamic overlay services are in WGS84 (see ...
CO Morrison US Topo (Browse Image for Story Map)
USGS personnel involved with The National Map program work with Federal, State, Tribal, and local partners for acquiring data. Composite base maps are a result of this data acquisition and production effort. Our base maps accurately reflect data holdings of The National Map, but some features may not be positionally accurate or complete, or up-to-...
Updated 2015 version of Tupelo, Mississippi US Topo quadrangle with orthoimage turned on
Composite base maps are recached about once a year. Although data in dynamic service overlays are ideally updated quarterly, it can sometimes take up to six months. Please note that there will be times when composite base maps and dynamic service overlays are not in synchronization because of a difference in refresh cycles.
Small Scale Collection USA
USGS cartographers compared older USGS 1:100,000- and 1:250,000-scale map series requirements, and for smaller scales, they compared popular base maps already in use. The goal for cartography was to have a WYSIWYG (what you see is what you get) experience when you download data or the US Topo product, so decisions were made to show features for...
Photo of Santa Fe, New Mexico 2013 United States Topo map
USGS cartographers first leveraged cartographic decisions made for the USGS 1:24,000/1:25,000-scale map series requirements, and for the new US Topo product using diverse landscape sample areas, such as varying densities of features, rural vs. urban, land cover, and territorial differences, for testing the base map at each scale. They also...
New 2014 US Topo quadrangle of the Three Fingered Jack, Oregon, area
Yes, visit The National Map-Service Endpoints list.  There are REST and WMS links in addition to a Google Earth link at the top of each REST service URL. For additional guidance, please go to The National Map Viewer Quick Start Guide.
AK Mount McKinley A-3 US Topo (Browse Image for Story Map)
A tiled service contains cached tiles, which render the map in small tile images. This allows the map to perform much faster when panning and zooming, compared to a dynamic service. Dynamic is considered an "old" way of displaying web maps, where each feature is called from the source data and drawn separately for every pan and zoom. Tiled base...
Chesapeake Bay 2014 Landsat imagery
The National Map offers a series of composite base maps, which combine layers into tile cache services with the cartographic richness of multiple data sources. The following base maps are available: USGS Topo - combines the most current data (boundaries, contours, geographic names, hydrography, land cover, structures, and transportation) that make...
HI Honolulu US Topo (Browse Image for Story Map)
Composite base maps have cached tiles to cover the whole world, but only for oceans, continents and countries at smaller scales.  Larger view scales have detailed data for the conterminous U.S., Alaska, Hawaii, Puerto Rico, U.S. Virgin Islands, Territory of Guam, Commonwealth of the Northern Mariana Islands, and other Pacific Islands.
Small Scale Collection USA
Vector data for small scales are from The National Map Small-Scale Collection(formerly National Atlas), while medium to large scales are comprised of The National Map themes, to include the National Hydrography Dataset (NHD) and Geographic Names Information System (GNIS) data. Other medium to large scale vector features are from USGS edited...
Download client.jpg
USGS does not currently offer vector downloads in bulk other than by special request only. For assistance, send an e-mail to tnm_help@usgs.gov, and include your contact information, requested product, requested area, and download format.