In April 2004 the source coverage was transitioned to storage in an Oracle RDBMS using the ArcSDE geodatabase model. The result (this version) is designated edition 20040408. Prior to this time the feature classe was stored as a coverage in the ISGS GISDB archive.
Edition 2.0 differed from edition 1.0 in that some sinkhole polygons in northwestern Illinois were deleted after field examination suggested that the depressions may have an origination other than by sinkhole formation. In addition, additional sinkhole area polygons were added in southern, southwestern, and western Illinois.
Weibel, C. P. , and Panno, S. V. , 1997, Sinkhole Areas (an indicator of karst terrain) in Illinois: ISGS GIS Database GISDB_HYDRO.IL_Sinkhole_Areas_Py, Illinois State Geological Survey, Champaign, Illinois.
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257222.
KARST - a value of "y" indicates polygon represents a karst area
SQMILES - area of the polygon in square miles
Sinkhole data can be used to appraise local, regional, and general geologic conditions that might affect excavation and construction of roads, pipelines, foundations, and sewers, and construction of wells. These sinkhole data are useful for local planning of surface projects which may have an impact on shallow aquifers. The data are useful for regional land-use planning projects designed to protect shallow karst aquifers. This map may be useful for the exploration and exploitation of limestone. Karstification may have an effect on the evaluation of limestone resources and an impact on the groundwater during limestone extraction.
These data are appropriate for use in regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base. The datasets were not and are not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS, the data have no legal basis in the definition of boundaries or property lines.
Bell, A. H., M. O. Oros, and J. Van Den , 1961, Petroleum Industry in Illinois, 1960: ISGS Illinois Petroleum 75, Illinois State Geological Survey, Champaign, Illinois.
Bretz, J H., 1923, Geology and Mineral Resources of the Kings Quadrangle: Illinois State Geological Survey Bulletin 43, Illinois State Geological Survey, Champaign, Illinois.
Bretz, J H., 1940, Solution cavities in the Joliet Limestone of northeastern Illinois: Journal of Geology v. 46, University of Chicago, Chicago, Illinois.
Buschbach, T.C., and G.E. Heim, 1972, Preliminary geologic investigations of rock tunnel sites for flood and pollution control in the greater Chicago area: Illinois State Geological Survey Environmental Geology Notes 52, Illinois State Geological Survey, Champaign, Illinois.
Csallany, S., and W.C. Walton, 1963, Yields of shallow dolomite wells in northern Illinois: Illinois State Water Survey Report of Investigation 46, Illinois State Geological Survey, Champaign, Illinois.
Devera, J.A., 1993, Geologic Map of the Wolf Lake Quadrangle, Jackson and Union Counties, Illinois.
Ford, D.C., and P.W. Williams, 1989, Karst Geomorphology and Hydrology: Unwin Hyman Ltd., London.
Graese, A.M., 1991, Facies Analysis of the Ordovician Maquoketa Group and Adjacent Strata in Kane County, Northeastern Illinois: ISGS Circular 547, Illinois State Geological Survey, Champaign, Illinois.
Hackett, J.E., and R.E. Bergstrom, 1956, Groundwater in northwestern Illinois: ISGS Circular 207, Illinois State Geological Survey, Champaign, Illinois.
Knappen, R.S., 1926, Geology and Mineral Resources of the Dixon Quadrangle: Illinois State Geological Survey Bulletin 49, Illinois State Geological Survey, Champaign, Illinois.
Kolata, D.R., and T.C. Buschbach, 1976, Plum River Fault Zone of Northwestern Illinois: ISGS Circular 491, Illinois State Geological Survey, Champaign, Illinois.
Kolata, D.R., T.C. Buschbach, and J.D. Trewor, 1978, The Sandwich Fault Zone of Northern Illinois: ISGS Circular 505, Illinois State Geological Survey, Champaign, Illinois.
Lamar, J.E., 1928, Karst Topography and Sanitary Engineering at Alton, Illinois: Trns. IL St Acad Sci 20.
Otto, G.H, 1963, Engineering Geology of the Chicago Area, in Foundation Engineering in the Chicago Area: Proceedings of Lecture Series, American Society of Civil Engineers N/A, Illinois Institute of Technology, Chicago, Illinois.
Piskin, K., and R.E. Bergstrom, 1975, Glacial Drift in Illinois: Thickness and Character: Illinois State Geological Survey Circular 490, Illinois State Geological Survey, Champaign, Illinois.
Rubey, W.W., 1952, Geology and Mineral Resources of the Hardin and Brussels Quad: Professional Paper 218, United States Geological Survey, unknown.
Treworgy, J.D., 1981, Structural Features in Illinois: A Compendium: Illinois State Geological Survey Circular 519, Illinois State Geological Survey, Champaign, Illinois.
White, W.B, 1988, Geomorphology and Hydrology of Karst Terrains: Oxford University Press, Inc., not available.
Willman, H.B., and others, 1967, Geologic Map of Illinois: Illinois State Geological Survey map same as title, Illinois State Geological Survey, Champaign, Illinois.
Zeizel, A.J., W.C. Walton, T.A. Prickett, and, 1962, Ground-water Resources of Du Page County: Illinois State Geological Survey Illinois State Water Survey Cooperative Ground-Water Report Report 2.
Source map underwent ISGS peer review. Line accuracy was checked by overlay of digital print-outs to original compilation maps. Lines within one line-width of source maps were deemed acceptable. Attribute accuracy was verified against source maps.
Prior to import, the spatial reference of the data set was changed to Geographic, decimal degrees, NAD83 in double precision.
Also at this time, this metadata file was updated.
Person who carried out this activity:
, University of Illinois Web Privacy Notice.
, University Copyright Policy (stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4).
, Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign.
Attribute code assignments were checked by at least two individuals and are believed to fully represent the original hand-drawn maps.
Boundaries of sinkhole area polygons represent actual ground positions, but are generalized. Thus, this data set should not be used at map scales larger than 1:100,000 without specific field verification.
This data set contains polygons indicating areas which are believed to contain sinkholes. Some sinkholes may not be represented on this map because of detection problems (primarily because of too small of a size, and dense vegetation cover). Not every sinkhole polygon was field checked. Therefore, it is possible that some depressions within the mapped polygons may have an origin different from sinkhole formation.
When this data set was in coverage form it was checked for complete chain-node topology (no dangling arcs, except where appropriate), boundary values appropriate for map projection and map units, and appropriate "fuzzy" tolerances. There are no known arc or polygon attribute values outside the appropriate value domains.
Are there legal restrictions on access or use of the data?
- ISGS information must be obtained directly from the ISGS or from an authorized distributor. Be aware that ISGS information obtained from an unauthorized third party may have been altered subsequent to original distribution, or may no longer be current.
Links to these are provided in the Cross References section.
- This feature class is for use at a scale of 1:100,000.
ISGS information is the property of and copyrighted by the Board of Trustees of the University of Illinois with all rights reserved. University copyright policy is stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4. A link is provided in the Cross References section.
Individuals or entities may make fair use of copyrighted ISGS material, such as reproducing a single figure or table, or using a brief text quotation, without obtaining formal permission, but in all cases the Illinois State Geological Survey must be credited as the source of the material. To reproduce ISGS information beyond the fair use standard, permission must be obtained from the ISGS Information Office, 615 East Peabody Drive, Champaign, Illinois 61820, 217-333-4747, email@example.com. License fees and a license agreement may be required, depending on the proposed usage.
Map information is to be used at a scientifically and cartographically appropriate scale, that is, at a scale no greater than indicated on the map or as described in the documentation of the map or map data. Map information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. Map information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor.
The data do not replace the need for detailed site-specific studies.
Disclaimer of Liability Disclaimer of Warranties and Accuracy of Data Disclaimer of Endorsement Disclaimer for External Links Disclaimer of Duty to Continue Provision of Data Security Choice of Law
The data are intended for use with GIS software. The ISGS uses ESRI ArcGIS software, however, ESRI formats can be imported into many different GIS software packages. It is expected that customers who obtain these data have the technical expertise to use GIS software. The ISGS does not provide software support of any kind.
Illinois Natural Resources Geospatial Data ClearinghouseGenerated by mp version 2.8.25 on Thu Apr 02 09:54:11 2009