Big Ten Academic Alliance Geospatial Discovery Portal

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101. Municipal Boundaries: Incorporated Places: Illinois, 2000

2006. US Census and Illinois State Geological Survey. This polygon feature class shows incorporated places and census designated places in Illinois as of the 2000 US census. The data are identical to t...

102. NAIP Digital Orthophoto Quadrangle Data: Illinois, 2014

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

103. National Wetlands Inventory: Illinois, 1987

1980. U.S. Fish and Wildlife Service, Illinois Department of Natural Resources, and Illinois Natural History Survey. This feature dataset contains wetlands and deepwater habitats in Illinois is of 1987 based on U.S. Fish and Wildlife Service National Wetlands Inve...

104. One-Hundred and Five-Hundred Year Floodzones for Unincorporated Areas: Illinois, 2006

1996. Illinois State Water Survey. This feature class was quickly assembled from old Arc/Info coverages to produce a general graphic image and has not reviewed or quality-controlled ...

105. 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...

106. PLSS Indian Treaty Boundary Lines: Illinois, 2003

1968. 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...

107. PLSS Townships: Illinois, 2003

1968. 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 ...

108. Political Districts and Boundaries: Illinois, 2006 and 2007

1980. Various, by feature class. This feature dataset contains data layers that show political districts and boundaries in Illinois, including political townships, state representa...

109. Political Townships: Illinois, 2009

1985. Tom Heavisides, Office of Realty and Environmental Planning. This map shows political township boundaries of Illinois.

110. Potential of Agricultural Chemical Contamination of Aquifers, 2004: Illinois

1995. Donald A. Keefer, Illinois State Geological Survey. This is a statewide SDE feature dataset for evaluating the potential for contamination of shallow aquifers by pesticides and nitrate. The sources o...

111. Public Land Survey System (PLSS) Boundaries: Illinois, 2003

1968. Illinois State Geological Survey. This data set contains Illinois Public Land Survey System (PLSS) boundaries and designations in line and polygon feature classes. THESE DATA HAVE P...

112. 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...

113. Quaternary Deposits: Illinois, 1996

1996. Barb Stiff. This feature dataset is a generalized version of Quaternary Deposits of Illinois. Updated to reflect the areal distribution of the Wedron and Mason...

114. Shaded Relief map: Illinois, 2006

1995. Abert, Curtis C. This raster dataset shows the landforms of Illinois with a shaded relief portrayal. Cell size is 301 feet and nominal map scale is 1:250,000. The d...

115. Sinkhole Areas (an indicator of karst terrain): Illinois, 2004

1992. C. P. Weibel and S. V. Panno. This feature class shows the distribution of areas that contain one or more sinkholes throughout the state of Illinois. Areas that contain sinkhole...

116. Soil Associations Map (500K): Illinois, 2004

1984. Illinois State Geological Survey. This is a polygon feature class showing soil associations in Illinois, from the General Soil Map of Illinois (Fehrenbacher, 1982). Created in 1984 ...

117. Stack-Unit Mapping of Geologic Materials to a Depth of 15 Meters: Illinois, 2004

1995. Illinois State Geological Survey. This is an SDE polygon feature class containing stack-unit map designations for Illinois. The primary source is ISGS Circular 542, Stack-unit Mappi...

118. State Boundary: Illinois, 2003

1968. Illinois State Geological Survey. This data set contains the Illinois state boundary in line and polygon format. There are two versions of the data included: one that includes the o...

119. State Plane Zones: Illinois, 2007

2007. Illinois State Geological Survey. This polygon feature class shows State Plane Coordinate System zones in Illinois.

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

2003. Lisa Smith, Chris Goldsmith, and Donald Luman. 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...