Greenmapping.org
Check out these online maps that you can use to search through 20 counties in the Chicago region, including Wisconsin and Indiana, and compile layer upon layer of useful information. The map is highly customizable, so you can choose an area by zip code, municipality, county, state or even watershed. Then you are able to choose what layers of data you want to see about that particular area, including floodplains, soils types, conservation easements, streets, wetlands, trails, and greenways.
