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Pennsylvania Spatial Data: Floodplains
From the site: "This raster dataset has been created using the "Floodplains from the PA Explorer CD-ROM edition" for each county in the study area as originated by the Office of... -
Database of the Geologic Map of North America
"The Geological Society of America’s (GSA) Geologic Map of North America (Reed and others, 2005; 1:5,000,000) shows the geology of a significantly large area of the Earth,... -
Pennsylvania Spatial Data: DEP Regions
From the site: "Spatially displays the six regions of Pennsylvania Department of Environmental Protection." -
GeoGratis-- Natural Resources Canada
Search, discover and download free maps, data and publications from Natural Resources Canada -
U.S. Census Bureau - Geography
Easy access to census data in map, KML, shapefile, and other formats. Could be used for GIS mapping. -
Pennsylvania Spatial Data: USGS Geopdfs
From the site: "Layered GeoPDF 7.5 Minute Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydrography, and... -
Fairfax County, VA GIS data collection
A listing of links for downloading GIS data regarding Fairfax County VA; of particular interest are the downloadable census/geography, soils, and water files. -
Pennsylvania Spatial Data: PA Ecoregions
From the site: "Draft ecoregions from the EPA."
E' possibile inoltre accedere al registro usando le API (vedi Documentazione API).