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
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
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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:
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?
- Access_Constraints: none
- Use_Constraints:
- This feature class is for use at a scale of 1:100,000.
Reproduction or redistribution of copyrighted digital data sets or products derived therefrom outside of licensee's organization or entity is expressly forbidden. The only exception is redistribution to consultants working for the licensee, and then only for purposes, related to work for the licensee. Such consultants may not further reproduce or redistribute these data sets. None of these data shall be electronically duplicated on magnetic or optical media for use by others, in whole or in part, without permission of DNR.
Any hardcopies utilizing DNR data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent DNR data sets, nor to imply that changes they made were approved by DNR.
The Illinois Department of Natural Resources (DNR) provides these geographic data "as is." DNR makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. DNR further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers of DNR, no warranty, expressed or implied, is made by DNR regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty.In no event shall the DNR have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by DNR.
The data are intended for use with GIS software. The ISGS uses ESRI ArcGIS software, however, the ESRI shapefile format can be imported into many different GIS software packages.It is expected that customers who order this data have the technical expertise to use GIS software. The ISGS does not provide software support of any kind.