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U.S. Geological Survey
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Illinois Geospatial Data Clearinghouse
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1. Digital Orthophoto Quadrangle (DOQ) Data: Illinois, 1998 - 2001
1998. U.S. Geological Survey. This is a collection of tile-by-tile NAPP-III DOQs (1998-2001) images in MrSID format for the state of Illinois, in UTM Zones 15 and 16, NAD83. Ort...
2. U.S. Geographic Names Information System (GNIS): Illinois Portion, 2006
1974. U.S. Geological Survey. This metadata document is abstracted from the GNIS metadata provided with the original data, with some ISGS-specific information added. The origina...