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2. NAIP Digital Orthophoto Quadrangle Data: Illinois, 2014

2005. USDA-FSA-APFO Aerial Photography Field Office and Illinois State Geological Survey. This data set contains imagery from the National Agricultural Imagery Program (NAIP). NAIP acquires digital ortho imagery during the agricultural g...
illinois

3. Physiographic Divisions: Illinois, 2004

1993. Illinois State Geological Survey. This is an ESRI feature class showing boundaries for physiographic divisions in Illinois. Data are originally from ISGS Report of Investigations 12...
illinois

4. PLSS Indian Treaty Boundary Lines: Illinois, 2003

1968-1979. Illinois State Geological Survey. This data set contains Indian Treaty boundary lines from the Illinois Public Land Survey System. The nominal scale is 1:62,500. As of 2003, the dat...
illinois

5. PLSS Townships: Illinois, 2003

1968-1979. Illinois State Geological Survey. This dataset contains townships from the Illinois Public Land Survey System in line and polygon form. Line attributes identify state, township and ...
illinois

6. Quaternary Deposits: Illinois, 1979

1979. Illinois State Geological Survey. Digital representation of the Quaternary Deposits in Illinois map by Lineback (1979). Map scale is 1:500,000. Shows Quaternary deposits that lie at...
illinois

7. Statewide 30-Meter Digital Elevation Model: Illinois, 2003

2003. Lisa Smith, Chris Goldsmith, Donald Luman, and Illinois State Geological Survey. This data set is a digital elevation model (DEM) of Illinois in ArcInfo grid format. The data are stored in UTM coordinates, using a Transverse Mer...