Illinois Department of Energy and Natural Resources, and Illinois Geographic Information System, 1991, Municipal Boundaries in Illinois: Incorporated Places: ISGS GIS Database GISDB.IL_ADMIN_Municipality_1990_Py, lllinois 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.
FIPS_PLACE FIPS code for each census designated place or incorporated area. A CDP comprises densely settled concentrations of population that are identifiable by name, but not be legally incorporated. from FIPS Publication 55.
PLACE_NAME Name of the municipality, Lower case with caps. from Census of Population and Housing, 1990: Public Law 94-171. Data on CD-ROM: U.S. Bureau of the Census.
TYPE See DOMAIN. General indication of size. from Census of Population and Housing, 1990: Public Law 94-171. Data on CD-ROM: U.S. Bureau of the Census.
Domain: roughly based on population differences <null> - not an incorporated area (internal islands) city - city town - town village - village CDP - Census Designated Place no census - Added independent of the census data
GIS processing: Illinois Department of Energy and Natural Resources Documentation: Illinois Department of Energy and Natural Resources, ISGS Quality Control: Illinois Department of Energy and Natural Resources
These data are appropriate for use in local and regional demographic analysis. Attributes include the name, FIPS code and type of municipality. A municipality may be composed of more than one polygon. Boundaries are subject to change and should not be considered definitive.
These data are appropriate for use in regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base. The data set was not and is not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS as a thematic, reference, or base layer for maps, the data set has no legal basis in the definition of boundaries or property lines.
US Department of Commerce, Bureau of the Census., 1991, TIGER/Line files, issued July, 1991 on CD-ROM issued July, 1991 and associated technical documentation..
Illinois Dept of Energy and Nat, Illinois Geographic Information System (, 1993, Towns, 1993.
The polygon features were imported into the ISGS SDE enterprise database following steps outlined in ISGS procedure GISDB_0009.
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.
Data are an accurate reflection of the Bureau of the Census TIGER/Line files. Attribute data are believed to be tied to the proper area with 100 percent accuracy relative to the Tiger/LINE data.
Data are derived from Tiger/LINE files and are believed to have reasonable positional accuracy to around 167 feet. This estimate is derived form USGS National Map Accuracy standards for map scale of 1:100,000.
All incorporateed places identified in the TIGER/Line files, 1991, are included.
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.
- 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 09 08:53:08 2009