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Collection
Illinois Geospatial Data Clearinghouse
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Year
1998
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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. USGS Quadrangle Boundaries and Corner Points in NAD83: Illinois, 2002
1998. Illinois State Geological Survey. This feature dataset contains point, line and polygon data that describe ideal USGS quadrangle boundaries and corner points for quadrangles that in...