The National Map
From CCoWS Wiki
The National Map is a multi-agency effort to improve and deliver topographic information for the USA.
The National Map includes a geographic data viewer and server hosted by the USGS that provides free and easy access to spatial data for:
- Elevation
- Hydrography
- Transportation (roads etc.)
- Boundaries
- Land Cover
- Aerial imagery
- Topo (contour) maps
- etc.