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1. Digital Elevation Model (DEM) of Illinois at 1:250,000 [IGDNR_ALLST_INT]
This Arc/Info grid (raster) data set consists of edge-matched USGS 1:250,000 DEM tiles for Illinois. Cell size is 301 feet and cell values are elevations in meters above mean sea level ...


2. Physiographic Divisions of Illinois [IGDNR_PHYSIO]
This data set records information about the Physiographic divisions of Illinois. The data set was digitized so that it could be included as an inset map on the 'Shaded Relief Map ...


3. Shaded Relief Map of Illinois [IGDNR_SHADEDREL]
This map shows the landforms of Illinois with a shaded relief portrayal. Nominal map scale is 1:250,000. This TIF image was derived from USGS Digital Elevation Model (DEM) data. ...


4. Slopes in Illinois Derived from the USGS Digital Elevation Model (DEM) from the Illinois State Geological Survey [IGDNR_STSLOPE]
Such data are useful in creating shaded relief images, characterizing topography and morphology, analyzing erosion potential and gross stream valley characteristics, and investigating ...


5. Statewide Surface TIN of Illinois [IGDNR_ALLST_TIN]
These data are a Triangular Irregular Network (TIN) surface topography representation for the state of Illinois. The data include all of Illinois and extend approximately nine miles beyond ...


6. Structural Features in Illinois: Areal Extent of Anticlines, Domes, and the Glasford Disturbance (Polygon Features) [IGDNR_STRUCTPOLY]
These data are for use at a scale of 1:500,000 or smaller only. They are appropriate for use in regional thematic analysis, for display purposes, and for mapping environmental phenomena ...


7. Ecological Database of the World's Insect Pathogens [EDWIP]
The Ecological Database of the World's Insect Pathogens (EDWIP) offers information on fungi, viruses, protozoa, mollicutes, nematodes, and bacteria that are infectious in insects, mites, and related ...


8. Hail Database for the U.S. [MRCC_HAILDB]
This CD-ROM was created by Changnon Climatologist, Mahomet, IL. The project to obtain and assess the hail data and to create the hail database on this CD-ROM was funded under ...


9. Thunderstorm Data for the U.S. [MRCC_TSTORM_CD]
This CD-ROM contains historical (1901-1995) thunderstorm-day counts for 734 cooperative observer stations and 121 first order stations across 47 states (excluding Alaska, Hawaii ...


10. A Directory of Illinois Nature Preserves [IGDNR_NATPRES]
This data set depicts the nature preserves of Illinois, digitized from USGS 7.5 minute quadrangles. A nature preserve is an area of land or water in public or private ownership that is ...


11. Aquifer Sensitivity to Contamination by Nitrate Leaching in Illinois [IGDNR_NO3AQSENS]   CHILD DIFs
This data set was designed for statewide evaluation of agrichemical leaching characteristics and associated aquifer sensitivity to contamination. It was created to classify soils ...


12. Aquifer Sensitivity to Contamination by Pesticide Leaching in Illinois [IGDNR_PESTAQSENS]   CHILD DIFs
This data set was designed for statewide evaluation of agrichemical leaching characteristics and associated aquifer sensitivity to contamination. It was created to classify soils ...


13. Bedrock Geology of Illinois [IGDNR_BEDGEO]
This map shows the distribution and extent of the bedrock geologic units within the State of Illinois, as depicted on the Geologic Map of Illinois (1967) by Willman and others, published ...


14. Bedrock Valleys of Illinois [IGDNR_ALLST_BEDVAL]
This data set shows continuous lines representing the lowermost elevations/locations of (buried) bedrock valleys in the state of Illinois. Additionally, names of buried valleys are annotated. ...


15. Coal Stratigraphic Data [IGDNR_ALLST_COALSTRAT]
ASCII database of stratigraphic information for the Danville, Herrin, and Springfield Coals from over 25,000 drill hole and outcrop descriptions of Pennsylvanian stratigraphy. Coordinates ...


16. Coarse-grained Materials Within 50 Feet of the Ground Surface in Illinois [IGDNR_ALLST_AQ50]
This map shows the distribution of coarse-grained materials and permeable bedrock within 50 feet of ground surface in Illinois. This includes bedrock, sand and gravel, and alluvial units ...


17. Critical Trends Assessment Land Cover Database of Illinois, 1991-1995 [IGDNR_LANDCOV]
County by county land cover grid data for Illinois derived from Thematic Mapper (TM) Satellite data from the Landsat 4 sensor. Dates of the imagery used range from April, 1991 to May, ...


18. Driftless Areas in Illinois [IGDNR_DRIFTLESS]
This is an Arc/Info polygon data set containing driftless areas in Illinois. These areas are analogous to areas of the state where the bedrock surface is not buried. Data are originally ...


19. Glacial Boundaries in Illinois [IGDNR_GLCBND]
This is an Arc/Info polygon data set containing glacial boundary lines representing the extent of glaciation for major glacial episodes in Illinois. Data are originally from the Quaternary ...


20. Glacial Drift in Illinois: Thickness and Character [IGDNR_DRIFTTHK]
This map is a digital Arc/Info line and polygon coverage of drift thickness in Illinois. Data are originally from ISGS Circular 490 by Piskin and Bergstrom (1975), Plate 1. Contours (lines) ...


21. Hydrologic Catalog-Units for Illinois [IGDNR_ALLST_CATUNITS]
USGS hydrologic cataloging units for the state of Illinois. The USGS has divided each state into regions, subregions, accounting units, and cataloging units. All of Illinois is in region ...


22. Illinois Soil Associations Map (500K) [IGDNR_SOILASSOC]
Soil Associations in Illinois, from the General Soil Map of Illinois (Fehrenbacher, 1982). Created in 1984 by ESRI. A soil association is a group of related soil series that generally ...


23. Landslide Inventory of Illinois [IGDNR_LNDSLD85]
This is a digital version of Plate 1 of ISGS Circular 534. This coverage shows polygon locations of landslides in Illinois. Features are described as earth slumps, slumps on bedrock, rock ...


24. Major Bedrock Aquifers Within 300 Feet of Ground Surface [IGDNR_ALLST_AQMB300]
This map shows the distribution of major bedrock aquifer units within 300 feet of ground surface containing potable water in Illinois. Major aquifers are capable of yielding 70 gallons ...


25. Major Bedrock Aquifers Within 500 Feet of Ground Surface [IGDNR_ALLST_AQMB500]
This map shows the distribution of major bedrock aquifer units within 500 feet of ground surface containing potable water in Illinois. Major aquifers are capable of yielding 70 gallons ...


26. Major Bedrock Aquifers at Depths Greater Than 500 Feet Below Ground Surface [IGDNR_AQMBG500]
This map shows the distribution of major bedrock aquifer units at depths greater than 500 feet below ground surface in Illinois. Major aquifers are capable of yielding 70 gallons of water ...


27. Major Sand and Gravel Aquifers in Illinois [IGDNR_AQMSG]
This map shows the distribution of major sand and gravel aquifers at any depth in Illinois. Generally, the tops of such aquifers lie within 300 feet of the surface and the bases occur ...


28. Nitrate Leaching Class Ranges [IGDNR_NO3LRANGE]   PARENT DIF
This is a statewide Arc/Info data set of nitrate leaching class ranges for soils in Illinois. It was generated to aid in determining aquifer sensitivity to nitrate leaching in Illinois. ...


29. Nitrate Leaching Classes of Illinois Soils [IGDNR_NO3LEACH]   PARENT DIF
This data set was designed for statewide evaluation of agrichemical leaching characteristics and associated aquifer sensitivity to contamination. It was created to classify soils ...


30. Oil and Gas Pipelines and Facilities in Illinois - Lines [IGDNR_PIPELINE]
Created in 1984 by ESRI to show distribution of oil and gas pipelines in Illinois. This Arc/Info coverage consists of line data representing oil and gas pipeline locations ...


31. Oil and gas fields in Illinois [IGDNR_ALLST_OILFIELDS]
This map shows oil and gas fields in Illinois as of 1984. Scale is 1:500,000. To show oil and gas fields. These data are appropriate for use in local and regional thematic analysis. ...


32. Pesticide Leaching Classes of Illinois Soils [IGDNR_PESTLEACH]   PARENT DIF
This data set was designed for statewide evaluation of agrichemical leaching characteristics. It was created to classify soils and aquifer settings according to predictions of leaching ...


33. Quaternary Deposits of Illinois [IGDNR_QUAT79]
Digital representation of the Quaternary Deposits in Illinois map by Lineback (1979). Map scale is 1:500,000. Shows quaternary deposits that lie at or near the land surface, including ...


34. Stack-Unit Mapping of Geologic Materials in Illinois to a Depth of 15 Meters [IGDNR_STACK_ST]
This is an Arc/Info polygon data set containing stack-unit map designations for Illinois. The primary source is ISGS Circular 542, Stack-unit Mapping of Geologic Materials in Illinois ...


35. Structural Features in Illinois: Faults [IGDNR_STRUCTFAULTS]
These data are for use at a scale of 1:500,000 or smaller only. They are appropriate for use in regional thematic analysis, for display purposes, and for mapping environmental phenomena ...


36. Structural Features in Illinois: Line Features (Axial or Flexure) of Anticlines, Synclines and Monoclines [IGDNR_STRUCTCLINES]
These data are for use at a scale of 1:500,000 or smaller only. They are appropriate for use in regional thematic analysis, for display purposes, and for mapping environmental phenomena ...


37. Structural Features in Illinois: Point Locations of Impact Features, Explosion Features, Silurian Reefs, and Buried Precambrian Hills [IGDNR_STRUCTPNTS]
These data are for use at a scale of 1:500,000 or smaller only. They are appropriate for use in regional thematic analysis, for display purposes, and for mapping environmental phenomena ...


38. Woodfordian Moraines of Illinois [IGDNR_MORAINES]
This is an Arc/Info polygon data set containing named Woodfordian moraines, or Wisconsinan end moraines, of Illinois. Scale is 1:500,000. The primary source for the data is ISGS Bulletin ...


39. Entomology Checklists and Databases of The Illinois State Museum [SCZD_ISM]
The Illinois State Museum has an active research program in Entomology. The strengths of the program include research on Lepidoptera (butterflies and moths) and Odonata (dragonflies and damselflies) ...


40. The Mercury Deposition Network: A National Atmospheric Deposition Program (NADP) Network [NADP_MDN]
The Mercury Deposition Network (MDN) is a national database of weekly concentrations of total mercury in precipitation and the seasonal and annual flux of total mercury in wet deposition. The data ...


41. FAUNMAP- An Electronic Database Documenting Late Quaternary Distributions of Mammal Species [Faunmap]
FAUNMAP is an electronic database documenting the late Quaternary distribution of mammal species in the United States. It has been developed at the Illinois State Museum (ISM) with support from the ...


42. Water and Atmospheric Resources Monitoring Network [USDA0189]
To collect real-time weather information important to frost warning and protection, monitoring and prediction of phenological development of insect and disease pests, crop evapotranspiration, wind ...


43. National Atmospheric Deposition Program/National Trends Network (NADP/NTN): Precipitation Chemistry Database [NADP_NTN]   CHILD DIFs
The National Atmospheric Deposition Program/National Trends Network (NADP/NTN) is a 200-station, rural, wet-only deposition monitoring network throughout the continental United States, Alaska, and ...


44. Illinois Natural Areas - Part 1 - Polygons [IGDNR_NATAREA]
This data set depicts the natural areas in Illinois, digitized from USGS 7.5 minute quadrangles or from aerial photographs at a scale of 1:8,000. Boundaries are approximate and do not indicate ownership ...


45. Illinois State Conservation Areas [IGDNR_STCONSRV]
Appropriate for use in local and regional thematic analysis. Data are not accurate enough to be used as a geodetic or engineering base. Intended to include representation for each Conservation Area. ...


46. Illinois State Fish and Wildlife Areas [IGDNR_STFWA]
This data set shows state Fish and Wildlife Areas. Digitized from maps provided by DNR, county plat books, USGS TIGER files, and 1:24,000 quadrangle maps. Boundaries are approximate and do not indicate ...


47. Illinois State Forests [IGDNR_STFOREST]
This data set shows state forests in Illinois. Digitized from maps in county plat books or from 1:24K quadrangle maps. Boundaries are approximate and do not indicate ownership or property boundaries. ...


48. Buried Bedrock Surface of Illinois [IGDNR_BEDTOPO]
The Buried Bedrock Surface of Illinois map represents the first revision of the bedrock topography map since the second edition was published by the Illinois State Geological Survey (Horberg, 1957). ...


49. Midwestern Regional Climate Center Online Data and Climate Data Services [MRCC_CLIMDATA]
Link to all products and services: "http://mrcc.sws.uiuc.edu" National Climatic Data Center (NCDC) and the Illinois State Water Survey in Champaign, Illinois. Our center is a partner in a national ...


50. Climate Data from the Illinois State Climatologist Office [ILLINOIS_STATECLIM]
Illinois State Climatologist Office home page: "http://www.sws.uiuc.edu/atmos/statecli/" The Illinois State Climatologist Office offers various climate data for the state of Illinois from its web ...


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