Big Ten Academic Alliance Geospatial Discovery Portal

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1. Bedrock Geology: Illinois, 2005

2005. Illinois State Geological Survey. This feature dataset shows the distribution and extent of the bedrock geologic units within the State of Illinois, as depicted on the map Bedrock G...

2. Bedrock Geology of Illinois - Geologic Units, 2004

1996. Illinois State Geological Survey. This feature class shows the distribution and extent of the bedrock geologic units within the State of Illinois, as depicted on the Geologic Map of...

3. Buried Bedrock Surface: Illinois, 2004

1994. Herzog, B.L.. B.J. Stiff, C.A. Chenoweth, K.L. Warner, J.B. Sievering, C. Avery. The Buried Bedrock Surface of Illinois map represents the first revision of the bedrock topography map since the second edition was published by th...

4. County Boundaries: Illinois, 2003

1968. Illinois State Geological Survey. This data set contains Illinois county boundaries in line and polygon formats. The polygon attribute data include county name and number (FIPS) des...

5. Digital Elevation Model (DEM) at 1:250,000: Illinois, 2006

1994. Abert, Curtis C. This raster dataset consists of edge-matched USGS 1:250,000 DEM tiles for Illinois. Cell size is 301 feet and cell values are elevations in meters ...

6. 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...

7. Driftless Areas: Illinois, 2004

1994. Illinois State Geological Survey. This is a polygon feature class containing driftless areas in Illinois. These areas are analogous to areas of the state where the bedrock surface i...

8. Glacial Drift: Thickness and Character: Illinois, 2004

1994. Illinois State Geological Survey. This is an SDE feature dataset showing drift thickness in Illinois. Data are originally from ISGS Circular 490 by Piskin and Bergstrom (1975), Plat...

9. Height Modernization (ILHMP) LiDAR Data: Alexander County, Illinois: 2011

2011. Wilson & Company, Inc. This dataset consists of modified FEMA-grade LiDAR point cloud data for the Illinois River floodplain in the following pools: Marseilles Pool (only...

10. Height Modernization (ILHMP) LiDAR Data: Bond County, Illinois: 2015

2015. This Digital Terrain Model (DTM) data was produced all or in part from LiDAR information as of 2015. The LiDAR derived DTM covers Bond County, Illi...

11. Height Modernization (ILHMP) LiDAR Data: Boone County, Illinois: 2007

2007. This data set was developed for the United States Geological Survey. by Sanborn Mapping. Provide FEMA compliant elevation, topography and contour map of Boone County, Illinois. Provide Bare Earth DEM (vegetation removal) of Boone County...

12. Height Modernization (ILHMP) LiDAR Data: Bureau County, Illinois: 2015

2015. Surdex Corporation. This project involved fixed wing aerial LIDAR data collected at a contracted point spacing of 0.70 meters for the Illinois County of Bureau totalin...

13. Height Modernization (ILHMP) LiDAR Data: Calhoun County, Illinois: 2011

2011. Wilson & Company, Inc. This dataset consists of modified FEMA-grade LiDAR point cloud data for the Illinois River floodplain in the following pools: Marseilles Pool (only...

14. Height Modernization (ILHMP) LiDAR Data: Carroll County, Illinois: 2009

2009. Quantum Spatial, Inc (formerly AeroMetric, Inc.). This LiDAR data is within Illinois Department of Transportation District 2 and includes Carroll County, Illinois. The data is updated from its orig...

15. Height Modernization (ILHMP) LiDAR Data: Champaign County, Illinois: 2008

2008. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This LiDAR data is within Illinois Department of Transportation District 5 and includes Champaign County, Illinois. The data is updated from its or...

16. Height Modernization (ILHMP) LiDAR Data: Clark County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

17. Height Modernization (ILHMP) LiDAR Data: Clay County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

18. Height Modernization (ILHMP) LiDAR Data: Clinton County, Illinois: 2015

2015. Surdex Corporation. This Digital Terrain Model (DTM) data was produced all or in part from LiDAR information as of 2015. The LiDAR derived DTM covers Clinton County, I...

19. Height Modernization (ILHMP) LiDAR Data: Coles County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

20. Height Modernization (ILHMP) LiDAR Data: Crawford County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

21. Height Modernization (ILHMP) LiDAR Data: Cumberland County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

22. Height Modernization (ILHMP) LiDAR Data: Dewitt County, Illinois: 2012

2012. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data a...

23. Height Modernization (ILHMP) LiDAR Data: Douglas County, Illinois: 2012

2012. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data a...

24. Height Modernization (ILHMP) LiDAR Data: Dupage County, Illinois: 2006

2006. Aero-Metric, Inc. DuPage County, IL LiDAR.

25. Height Modernization (ILHMP) LiDAR Data: Dupage County, Illinois: 2014

2014. Quantum Spatial, Inc. Contract ID: E114-23580 Purchase Order: A19461 Quantum Spatial Project No: 1140311 LiDAR data collection is to produce high accuracy models of the ...

26. Height Modernization (ILHMP) LiDAR Data: Edgar County, Illinois: 2012

2012. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data a...

27. Height Modernization (ILHMP) LiDAR Data: Edwards County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

28. Height Modernization (ILHMP) LiDAR Data: Effingham County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

29. Height Modernization (ILHMP) LiDAR Data: Fayette County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

30. Height Modernization (ILHMP) LiDAR Data: Ford County, Illinois: 2015

2015. Surdex Corporation. This project involved fixed wing aerial LIDAR data collected at a contracted point spacing of 0.70 meters for the Illinois Counties of Ford, Iroquo...

31. Height Modernization (ILHMP) LiDAR Data: Franklin County, Illinois: 2014

2014. Surdex Corporation. This project involved fixed wing aerial LIDAR data collected at a contractual point spacing of 1.0 meters with a actual nominal point spacing of 0....

32. Height Modernization (ILHMP) LiDAR Data: Fulton County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

33. Height Modernization (ILHMP) LiDAR Data: Gallatin County, Illinois: 2012

2012. Federal Emergency Management Agency. QA/QC checkpoints were collected by field survey throughout the AOI. These points were used for an independent (blind) quality check of the process...

34. Height Modernization (ILHMP) LiDAR Data: Grundy County, Illinois: 2008

2008. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This LiDAR data is within Illinois Department of Transportation District 3 and includes Grundy County, Illinois. The data is updated from its origi...

35. Height Modernization (ILHMP) LiDAR Data: Hamilton County, Illinois: 2012

2012. Federal Emergency Management Agency. QA/QC checkpoints were collected by field survey throughout the AOI. These points were used for an independent (blind) quality check of the process...

36. Height Modernization (ILHMP) LiDAR Data: Hardin County, Illinois: 2014

2014. Quantum Spatial, Inc. This dataset is LiDAR point cloud data and derivative models of Hardin County and Pope County, Illinois. The area of acquisition is approximately 7...

37. Height Modernization (ILHMP) LiDAR Data: Henderson County, Illinois: 2012

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

38. Height Modernization (ILHMP) LiDAR Data: Henry County, Illinois: 2009

2009. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This LiDAR data is within Illinois Department of Transportation District 2 and includes Henry County, Illinois. The data is updated from its origin...

39. Height Modernization (ILHMP) LiDAR Data: Illinois

2014. This Digital Terrain Model (DTM) data was produced all or in part from LiDAR information as of 2015. The LiDAR derived DTM covers Bond County, Illi...

40. Height Modernization (ILHMP) LiDAR Data: Jackson County, Illinois: 2014

2014. Surdex Corporation. This project involved fixed wing aerial LIDAR data collected at a contracted point spacing of 1.0 meters for the Illinois Counties of Perry, Frankl...

41. Height Modernization (ILHMP) LiDAR Data: Jasper County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

42. Height Modernization (ILHMP) LiDAR Data: Jefferson County, Illinois: 2012

2012. The Sidwell Company. The LiDAR data for this Jefferson County, Illinois auto-generated 2 foot contours project was acquired on March 09, & March 10, 2012 with a Leica A...

43. Height Modernization (ILHMP) LiDAR Data: Jefferson County, Illinois: 2015

2015. Surdex Corporation. This project involved fixed wing aerial LIDAR data collected at a contracted point spacing of 1.0 meters for the Illinois Counties of Jefferson and...

44. Height Modernization (ILHMP) LiDAR Data: Jersey County, Illinois: 2011

2011. Wilson & Company, Inc. This dataset consists of modified FEMA-grade LiDAR point cloud data for the Illinois River floodplain in the following pools: Marseilles Pool (only...

45. Height Modernization (ILHMP) LiDAR Data: Jo Daviess County, Illinois: 2009

2009. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This LiDAR data is within Illinois Department of Transportation District 2 and includes Jo Daviess County, Illinois. The data is updated from its o...

46. Height Modernization (ILHMP) LiDAR Data: Kane County, Illinois: 2008

2008. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This LiDAR data is within Illinois Department of Transportation District 1 and includes Kane County, Illinois. The data is updated from its origina...

47. Height Modernization (ILHMP) LiDAR Data: Kankakee County, Illinois: 2014

2014. Quantum Spatial, Inc. This dataset is 1 ppsm LiDAR point cloud data and derivative models of Kankakee County, Illinois. Kankakee County is approximately 677 square miles...

48. Height Modernization (ILHMP) LiDAR Data: Kendall County, Illinois: 2010

2010. Merrick & Co. The Classified Point Cloud LAS ASPRS ver 1.2 files consist of 5 different classifications: Unclassified, Ground, Noise, Water and Ignored Ground. M...

49. Height Modernization (ILHMP) LiDAR Data: Knox County, Illinois: 2012

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

50. Height Modernization (ILHMP) LiDAR Data: Lake County, Illinois: 2007

2007. Merrick & Co. The Classified Point Cloud LAS files consist of 5 different classifications: Unclassified, Ground, Noise, Water and Ignored Ground. Merrick used th...

51. Height Modernization (ILHMP) LiDAR Data: Lawrence County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

52. Height Modernization (ILHMP) LiDAR Data: Lee County, Illinois: 2009

2009. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This LiDAR data is within Illinois Department of Transportation District 2 and includes Lee County, Illinois. The data is updated from its original...

53. Height Modernization (ILHMP) LiDAR Data: Livingston County, Illinois: 2015

2015. Surdex Corporation. This project involved fixed wing aerial LIDAR data collected at a contracted point spacing of 0.70 meters for the Illinois Counties of Ford, Iroquo...

54. Height Modernization (ILHMP) LiDAR Data: Logan County, Illinois: 2013

2013. Quantum Spatial, Inc. Task Order:G13PD00885 Contract ID: G10PC00025 This dataset is LiDAR point cloud data and derivative models of Logan County, Illinois. The area of a...

55. Height Modernization (ILHMP) LiDAR Data: Macon County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

56. Height Modernization (ILHMP) LiDAR Data: Marion County, Illinois: 2015

2015. Surdex Corporation. This Digital Terrain Model (DTM) data was produced all or in part from LiDAR information as of 2015. The LiDAR derived DTM covers Marion County, Il...

57. Height Modernization (ILHMP) LiDAR Data: Marshall County, Illinois: 2013

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

58. Height Modernization (ILHMP) LiDAR Data: Mcdonough County, Illinois: 2012

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

59. Height Modernization (ILHMP) LiDAR Data: Mchenry County, Illinois: 2008

2008. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This LiDAR data is within Illinois Department of Transportation District 1 and includes McHenry County, Illinois. The data is updated from its orig...

60. Height Modernization (ILHMP) LiDAR Data: McLean County, Illinois: 2014

2012. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data a...

61. Height Modernization (ILHMP) LiDAR Data: Mercer County, Illinois: 2012

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

62. Height Modernization (ILHMP) LiDAR Data: Mississippi River North, Illinois: 2012

2011. Wilson & Company, Inc. This dataset consists of modified FEMA-grade LiDAR point cloud data for the Mississippi River floodplain in Navigation Pools 8 through 24. The data...

63. Height Modernization (ILHMP) LiDAR Data: Monroe County, Illinois: 2012

2012. Merrick & Co. ASPRS v1.4 final classified LAS data grouped into 12 classifications: 0 = created, never classified, 1 = Unclassified, 2 = Ground, 3 = Low Vegetati...

64. Height Modernization (ILHMP) LiDAR Data: Moultrie County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

65. Height Modernization (ILHMP) LiDAR Data: Ogle County, Illinois: 2009

2009. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This LiDAR data is within Illinois Department of Transportation District 2 and includes Ogle County, Illinois. The data is updated from its origina...

66. Height Modernization (ILHMP) LiDAR Data: Peoria County, Illinois: 2012

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

67. Height Modernization (ILHMP) LiDAR Data: Perry County, Illinois: 2014

2014. Surdex Corporation. This project involved fixed wing aerial LIDAR data collected at a contracted point spacing of 1.0 meters for the Illinois Counties of Perry, Frankl...

68. Height Modernization (ILHMP) LiDAR Data: Piatt County, Illinois: 2012

2012. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data a...

69. Height Modernization (ILHMP) LiDAR Data: Pope County, Illinois: 2014

2014. Quantum Spatial, Inc. This dataset is LiDAR point cloud data and derivative models of Hardin County and Pope County, Illinois. The area of acquisition is approximately 7...

70. Height Modernization (ILHMP) LiDAR Data: Pulaski County, Illinois: 2012

2012. Merrick & Co. ASPRS v1.2 final classified LAS data grouped into 10 classifications: 1 = Unclassified, 2 = Ground, 3 = Low Vegetation, 4 = Medium Vegetation, 5 = ...

71. Height Modernization (ILHMP) LiDAR Data: Putnam County, Illinois: 2012

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

72. Height Modernization (ILHMP) LiDAR Data: Randolph County, Illinois: 2012

2012. Merrick & Co. ASPRS v1.4 final classified LAS data grouped into 12 classifications: 0 = created, never classified, 1 = Unclassified, 2 = Ground, 3 = Low Vegetati...

73. Height Modernization (ILHMP) LiDAR Data: Richland County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

74. Height Modernization (ILHMP) LiDAR Data: River and Mississippi River South, Illinois: 2011

2010. Wilson & Company, Inc. This dataset consists of modified FEMA-grade LiDAR point cloud data for the Illinois River floodplain in the following pools: Marseilles Pool (only...

75. Height Modernization (ILHMP) LiDAR Data: Rock Island County, Illinois: 2009

2009. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This LiDAR data is within Illinois Department of Transportation District 2 and includes Rock Island County, Illinois. The data is updated from its ...

76. Height Modernization (ILHMP) LiDAR Data: Saline County, Illinois: 2011

2012. Federal Emergency Management Agency. QA/QC checkpoints were collected by field survey throughout the AOI. These points were used for an independent (blind) quality check of the process...

77. Height Modernization (ILHMP) LiDAR Data: Sangamon River, Illinois: 2012

2012. Federal Emergency Management Agency. Ground Control is collected throughout the AOI for use in the processing of LiDAR data to ensure data accurately represents the ground surface. QA/...

78. Height Modernization (ILHMP) LiDAR Data: Shelby County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

79. Height Modernization (ILHMP) LiDAR Data: Stark County, Illinois: 2012

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

80. Height Modernization (ILHMP) LiDAR Data: Stephenson County, Illinois: 2009

2009. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This LiDAR data is within Illinois Department of Transportation District 2 and includes Stephenson County, Illinois. The data is updated from its o...

81. Height Modernization (ILHMP) LiDAR Data: Tazewell County, Illinois: 2012

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

82. Height Modernization (ILHMP) LiDAR Data: Union County, Illinois: 2011

2011. Wilson & Company, Inc. This dataset consists of modified FEMA-grade LiDAR point cloud data for the Illinois River floodplain in the following pools: Marseilles Pool (only...

83. Height Modernization (ILHMP) LiDAR Data: Vermilion County, Illinois: 2012

2012. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data a...

84. Height Modernization (ILHMP) LiDAR Data: Wabash County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

85. Height Modernization (ILHMP) LiDAR Data: Wabash River, Illinois: 2012

2012. Federal Emergency Management Agency. QA/QC checkpoints were collected by field survey throughout the AOI. These points were used for an independent (blind) quality check of the process...

86. Height Modernization (ILHMP) LiDAR Data: Warren County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

87. Height Modernization (ILHMP) LiDAR Data: Washington County, Illinois: 2015

2015. Surdex Corporation. This Digital Terrain Model (DTM) data was produced all or in part from LiDAR information as of 2015. The LiDAR derived DTM covers Washington County...

88. Height Modernization (ILHMP) LiDAR Data: Wayne County, Illinois: 2011

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

89. Height Modernization (ILHMP) LiDAR Data: White County, Illinois: 2011

2012. Federal Emergency Management Agency. QA/QC checkpoints were collected by field survey throughout the AOI. These points were used for an independent (blind) quality check of the process...

90. Height Modernization (ILHMP) LiDAR Data: Whiteside County, Illinois: 2009

2009. Quantum Spatial, Inc. (formerly AeroMetric, Inc.). This LiDAR data is within Illinois Department of Transportation District 2 and includes Whiteside County, Illinois. The data is updated from its or...

91. Height Modernization (ILHMP) LiDAR Data: Will County, Illinois: 2014

2014. Quantum Spatial, Inc. This dataset is 1 ppsm LiDAR point cloud data and derivative models of Will County, Illinois, However after processing the dataset satisfies 2 ppsm...

92. Height Modernization (ILHMP) LiDAR Data: Williamson County, Illinois: 2011

2012. Federal Emergency Management Agency. QA/QC checkpoints were collected by field survey throughout the AOI. These points were used for an independent (blind) quality check of the process...

93. Height Modernization (ILHMP) LiDAR Data: Winnebago County, Illinois: 2007

2007. This data set was developed for the United States Geological Survey by Sanborn Mapping. Provide FEMA compliant elevation, topography and contour map of Winnebago County, Illinois. Provide Bare Earth DEM (vegetation removal) of Winnebag...

94. Height Modernization (ILHMP) LiDAR Data: Woodford County, Illinois: 2012

2011. AeroMetric, Inc. This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, ...

95. Historical Aerial Photography: Illinois, 1937-1947

1936. Illinois State Geological Survey. The primary data set consists of historical black and white aerial photographs from Illinois acquired during 1936 to 1941. Alternative years of pho...

96. Illinois Height Modernization (ILHMP): LiDAR Data: Madison County, Illinois 2014

2014. Quantum Spatial, Inc. This dataset is LiDAR point cloud data and derivative models of Madison County, Illinois. Madison County is approximately 904 square miles in south...

97. Major Bedrock Valleys: Illinois, 2004

1994. Illinois State Geological Survey. This feature dataset shows continuous lines representing the lowermost elevations/locations of (buried) bedrock valleys in the state of Illinois. A...

98. Mosaic of Des Plaines Watershed, IL/WI - TerraSource Orthorectified Imagery, 2000

2000. Illinois State Geological Survey and ImageAmerica. Note: The original metadata file was written by ImageAmerica. There are a few additions by ISGS required for archival and access in the Survey's en...

99. Mosaic of Digital Orthophoto Quadrangles in UTM Zone 16, NAD83 Photography: Illinois, 2005

2005. U.S. Geological Survey, Surdex Corporation and Science Applications International Corporation (SAIC), and Illinois State Geological Survey. This data set is an SDE raster mosaic of DOQs from year 2005 that occur within the UTM Zone 16 portion of Illinois. The data are stored in the 'as ...

100. Mosaic of Illinois 7.5-minute Digital Raster Graphic (DRG) Images, 2003

2003. Illinois State Geological Survey. This is a statewide ArcSDE Raster Mosaic of USGS DRG images of 7.5-minute topographic quadrangles occurring in Illinois. These are unmodified DRG i...