National Geospatial Data Clearinghouse
This is a national collection of over 250 spatial data servers.
USGS The GEO-DATA Explorer is a site to access, view, and download data supported by the USGS. Another USGS website is the National Map Seamless Data Distribution System , an interactive website that generates downloadable maps.
Bureau of Transportation Statistics Besides transportation data, this site has dataset on urbanized areas. Two shapefile links include
2002 National Transportation Atlas Data Shapefile Download Center
Dynamap/1000 Street Shapefile Download Center
. These sites provides access to downloadable datasets for selected states and the entire nation.
Geospatial One Stop Sponsored by the Federal Office of Management and Budget (OMB), this site is maintained to facilitate easier, faster and cheaper access to geospatial data for all levels of government and the public at large.
Environmental Protection Agency This page offers GeoSpatial Data Clearinghouse, but also offers a link to Spatial Data and Applications - EnviroFacts Warehouse, and BASINS site. Check out Environmental Information Management System page.
US Fish and Wildlife Service GIS and Spatial Data Contains national and state datasets.
National Park Service GIS Contains links to datasets and an interactive map center of national parks.
Jet Propulsion Laboratory - U.S. and worldwide orbital imagery and thermography; links to NASA and foreign space agencies involved in cooperative mapping projects. Some data not publicly distributed.