Public platform for exploring and downloading open data, discovering and building apps, and engaging to solve important local issues. Use this site to analyze and combine Open Datasets using maps, as well as develop new web and mobile applications.Contains many of the elements that comprise the built environment, from streets to building footprints to zoning and land use data.
A collaborative effort among the USGS and other Federal, State, and local partners to improve and deliver topographic information for the Nation. Includes orthoimagery (aerial photographs), elevation, geographic names, hydrography, boundaries, transportation, structures, and land cover.
Social Explorer “contains over 18,000 maps, hundreds of profile reports, 40 billion data elements, 335,000 variables and 220 years of data”. It can be used to locate census tract boundary information from 1940 to the present.