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USA - National Atlas Data
About Front page says: An atlas that gathers and presents information designed to help us understand continental-scale environmental issues has been released by the Commission... -
US Census Bureau TIGER data
The US government's 'Topologically Integrated Geographic Encoding and Referencing' system, usually referred to as TIGER, is based on an extensive database of US geographic... -
Shuttle Radar Topography Mission Elevation Data
Description From http://www2.jpl.nasa.gov/srtm/: ... The Shuttle Radar Topography Mission (SRTM) obtained elevation data on a near-global scale to generate the most complete... -
Landsat Data
Description Landsat ETM+, TM, and MSS data are available from USGS for free. Base data page leads on to: http://eros.usgs.gov/products/satellite/landsat_ortho.html Not entirely... -
Diva GIS Global Vector data
A mixture of data sources some of which are derived from ohter projects and should be linked - GADM, DCW etc. -
City of Chicago
About There have been several blog posts about open data in Chicago (see here and here) - though there doesn't seem to be a single registry of open data....