Municipal Boundaries in Illinois: Incorporated Places

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Frequently-anticipated questions:


What does this data set describe?

Title: Municipal Boundaries in Illinois: Incorporated Places
Abstract:
Municipalities with more than 250 people at 1:100,000 statewide. Polygon data. Incorporated areas for all of Illinois. Derived from TIGER/Line Files, July 1991, Bureau of the Census, US Department of Commerce. Nominal scale of 1:100,000.
Supplemental_Information:
This is edition 20040330. The previous edition was 1.0. Recent updates: the data were converted from coverage storage model to SDE storage model.
  1. How should this data set be cited?

    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.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: (-92.000000)
    East_Bounding_Coordinate: (-87.000000)
    North_Bounding_Coordinate: (43.000000)
    South_Bounding_Coordinate: (36.000000)

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 1990
    Currentness_Reference: 1990 census

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • G-polygon (3454)

    2. What coordinate system is used to represent geographic features?

      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.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    Attribute items are in typical ArcSDE feature class format. Those items requiring additional explanation are:

    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


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    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

  3. To whom should users address questions about the data?

    Contact_Instructions: Please refer to the Distribution Information section.


Why was the data set created?

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.


How was the data set created?

  1. From what previous works were the data drawn?

    none (source 1 of 2)
    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..

    Type_of_Source_Media: online
    Source_Scale_Denominator: 100000
    Source_Contribution: Municipal Boundaries

    none (source 2 of 2)
    Illinois Dept of Energy and Nat, Illinois Geographic Information System (, 1993, Towns, 1993.

    Type_of_Source_Media: online
    Source_Scale_Denominator: 100000
    Source_Contribution: Town names

  2. How were the data generated, processed, and modified?

    Date: 1993 (process 1 of 2)
    ARC/INFO TIGERTOOL used to convert to ARC/INFO format, municipal boundaries were extracted as were FIPS Place codes. Data were projected into the lambert conformal projection.

    Date: 30-Mar-2004 (process 2 of 2)
    Source coverage (municipal90 from IGIS archive) converted to double precision and reprojected to GCS_NAD83 using Workstation ArcInfo 7.2.1.

    The polygon features were imported into the ISGS SDE enterprise database following steps outlined in ISGS procedure GISDB_0009.

    Metadata updated.

    Person who carried out this activity:

  3. What similar or related data should the user be aware of?

    , ISGS Terms of Use.

    Online Links:

    , University of Illinois Web Privacy Notice.

    Online Links:

    , University Copyright Policy (stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4).

    Online Links:

    , Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign.

    Online Links:


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    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.

  2. How accurate are the geographic locations?

    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.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    All incorporateed places identified in the TIGER/Line files, 1991, are included.

  5. How consistent are the relationships among the observations, including topology?

    None.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
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.

Any access to these data, Web sites, computer systems, electronic services, and electronic networks is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice.

Links to these are provided in the Cross References section.

Use_Constraints:
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, isgs@isgs.illinois.edu. License fees and a license agreement may be required, depending on the proposed usage.

Any use of these data is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice. Links to these are provided in the Cross References section.

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.

  1. Who distributes the data set? (Distributor 1 of 1)

    Information Office, Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois
    615 East Peabody Drive
    Champaign, Illinois 61820
    USA

    217-333-4747 (voice)
    isgs@isgs.illinois.edu

    Hours_of_Service: 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    Refer to the Legal Notices of Terms and Conditions of the University of Illinois Web Privacy Policy (there is a link in the Cross References section) for policy statements regarding the following:

    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

    By obtaining these data you agree to the provisions of the University of Illinois Web Privacy Policy, regardless of the manner in which the information was obtained.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    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.


Who wrote the metadata?

Dates:
Last modified: 24-Feb-2009
Metadata author:

Contact_Instructions: Please refer to the Distribution Information section.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Illinois Natural Resources Geospatial Data Clearinghouse

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