Archaeological Resource Potential in Illinois

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Frequently-anticipated questions:

What does this data set describe?

Title: Archaeological Resource Potential in Illinois
This is a statewide polygon feature class of areas in Illinois believed to possess a high archaeologic potential. It was developed by the Illinois State Museum and is intended for coarse regional analysis. The nominal map scale is 1:500,000 with a positional National Map Accuracy Standard value of 832 feet. Note however that the nature of the boundaries themselves, approximate limits of archaeologic potential, make specific statements of positional accuracy unimportant.

Background - The Illinois State Agency Historic Preservation Act (P.A. 86-707) mandates state government to preserve, restore, and maintain the historic resources of the state. Activities that can result in change of historic properties undertaken, supported or administered by a State agency are subject to review by the Illinois Historic Preservation Agency (IHPA). The IHPA also regulates private undertakings which require a permit from a State agency. Private undertakings that will affect a documented archaeological site or an area with a high potential for archaeological resources, must inventory and assess the scientific and historic potential of archaeological and historic properties within the project area. The Illinois State Museum (ISM) is responsible for preparing maps illustrating areas with a high probability for archaeological resources.

Based on the statewide distribution of documented archaeological resources, a high probability area "means any occurrence of Cahokia Alluvium, Carmi Member of Equality Formation, Grayslake Peat, Parkland Sand, Peyton Colluvium the Batavia Member of the Henry Formation, or the Mackinaw Member, as mapped by Lineback et al. (1979) at a scale of 1:5000,000 within permanent stream floodplains and including:

1) 500 yards of the adjoining bluff line crest of the Fox, Illinois, Kankakee, Kaskaskia, Mississippi, Ohio, Rock, and Wabash Rivers and 300 yards of the adjoining bluff line crest of all other rivers or,

2) a 500 yard wide area along the shore of Lake Michigan abutting the high water mark."

This statewide edition of the data is designated 20060817. The previous edition, stored as county-by-county coverages on the ISGS GIS system, was designated edition 1.0.
  1. How should this data set be cited?

    Museum, Illinois State , 1994, Archaeological Resource Potential in Illinois: ISGS GIS Database GISDB_QTGEO.IL_Arch_Resource_Potential_Py.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -92.0
    East_Bounding_Coordinate: -87.5
    North_Bounding_Coordinate: 42.5
    South_Bounding_Coordinate: 37.0

  3. What does it look like?

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

    Calendar_Date: 1994
    Currentness_Reference: Historic site map

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

    Geospatial_Data_Presentation_Form: map

  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 (372)

    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.


  7. How does the data set describe geographic features?



    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    File attribute items are in typical ArcSDE format. Polygon items requiring additional explanation are:

    HIGHPROB - Areas of High archaeologic potential, Illinois State Agency Historic Preservation Act (P.A. 86-707)

    0 - not high potential

    1 - area of high archaeological resource potential

    Entity_and_Attribute_Detail_Citation: none

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?

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

    Contact_Instructions: Please refer to the distribution information.

Why was the data set created?

To determine the probability of a high archaeological resource area. These data are appropriate for use in local and 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 reference base layer for maps, the data set has no legal basis in the definition of boundaries, property lines, or flood zones.

How was the data set created?

  1. From what previous works were the data drawn?

    none (source 1 of 3)
    D.H. Swann, P.B. DuMontelle, R.F. Mast, L.H. Van, 1970, ILLIMAP - A computer-Based Mapping System for Illinois: Illinois State Geological Survey Circular 451.

    Type_of_Source_Media: computer program
    Source_Scale_Denominator: unknown
    Source_Contribution: see process steps

    none (source 2 of 3)
    Lineback, J.A., 1979, Quaternary Deposits of Illinois: Illinois State Geological Survey Map same as title.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 500000
    ISM staff redigitized all of the quaternary deposits specified by the law.

    none (source 3 of 3)
    U. S. Geological Survey, 1987, Standards for Digital Line Graphs: USGS 1:100,000 DLG files DLG files for Illinois.

    Type_of_Source_Media: digital file
    Source_Scale_Denominator: 100000
    Source_Contribution: Hydrology information

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

    Date: Unknown (process 1 of 2)
    The steps taken in deriving the boundaries of high potential areas are as follows:

    1) The extent of the seven quaternary deposits mentioned above were hand-digitized by ISM personnel from Lineback (1979) from county size tiles that had been photo enlarged to 200 percent, making as effective digitizing scale of 1:250,000.

    2) Hydrology was clipped from the 1:100,000 USGS DLG data and permanent streams, wide streams, and shorelines were extracted. All ponds were then removed to produce a simple line coverage.

    3) The boundaries of Cahokia Alluvium were used to simulate the bluff edge.

    4) Those portions of Cahokia Alluvium associated with one of the 8 large rivers mentioned in the bill were extracted.

    5) The Cahokia Alluvium was buffered by 500 meters near the big rivers and 300 meters elsewhere.

    6) A buffer of 300 yards was produced around all permanent streams not associated with Cahokia Alluvium on the Lineback map.

    7) A small amount of edge matching was done at county boundaries, although some discrepancies still exist.

    Date: 16-Aug-2006 (process 2 of 2)
    The 102 county-by-county coverages were compiled into a single statewide coverage. The coverage data were in the customary ISGS Lambert Conformal Conic projection. For the 102 county coverages with identical PAT items and definitions, this was accomplished with the Arc Workstation command APPEND, as follows:

    APPEND ARCHMOD POLY <list of 102 coverages> END

    The coverage was then cleaned, dissolved, and converted to a shapefile:


    The data were then reprojected to lon/lat NAD83 using the Project function of ArcToolbox:

    Executing (Project_1): Project C:\archmod_py.shp C:\archmod_py_Project GEOGCS['GCS_North_American_1983',DATUM['D_North_American_1983',SPHEROID['GRS_1980',6378137.0,298.257222101]],PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]] NAD_1927_To_NAD_1983_NADCON Executed (Project_1) successfully.

    Person who carried out this activity:

    Illinois State Geological Survey

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

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

  1. How well have the observations been checked?

    The attributing is correct for all polygons.

  2. How accurate are the geographic locations?

    Unknown. Boundaries are estimates.

  3. How accurate are the heights or depths?

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

    Data set is complete in that the entire state is included. However, this map is a model of archaeological resource potential, not a map of a tangible resource with known boundaries. Clearly some areas with resource potential are not included, rather this map reflects the definition prescribed by law.

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

    Original coverage data are topologically structured polygons.

How can someone get a copy of the data set?

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

Access_Constraints: none
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.

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

    Illinois State Museum
    c/o Mike Wiant
    1011 E. Ash
    Springfield, Illinois 62703

    217-785-0134 (voice)

    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?

    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.

  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, 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.

Who wrote the metadata?

Last modified: 20-Sep-2006
Metadata author:

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

Illinois Natural Resources Geospatial Data Clearinghouse

Generated by mp version 2.8.25 on Thu Apr 02 09:53:57 2009