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."
Museum, Illinois State , 1994, Archaeological Resource Potential in Illinois: ISGS GIS Database GISDB_QTGEO.IL_Arch_Resource_Potential_Py.
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.
Coordinates defining the features.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
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
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.
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.
Lineback, J.A., 1979, Quaternary Deposits of Illinois: Illinois State Geological Survey Map same as title.
U. S. Geological Survey, 1987, Standards for Digital Line Graphs: USGS 1:100,000 DLG files DLG files for Illinois.
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.
APPEND ARCHMOD POLY <list of 102 coverages> END
The coverage was then cleaned, dissolved, and converted to a shapefile:
CLEAN ARCHMOD ARCHMOD2 0.002 0.002 POLY DISSOLVE ARCHMOD2 ARCHMOD3 HIGHPROB POLY ARCSHAPE ARCHMOD3 POLY archmod_py.shp
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:
The attributing is correct for all polygons.
Unknown. Boundaries are estimates.
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.
Original coverage data are topologically structured polygons.
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.
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.
Illinois Natural Resources Geospatial Data ClearinghouseGenerated by mp version 2.8.25 on Thu Apr 02 09:53:57 2009