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.
These data are not to be used for commercial profit.
GIS Processing: ISGS Staff Documentation: D. Nelson and S. Beaverson Quality Control: ISGS Staff
1) black line separate, representing all boundaries of coal bodies, 2) red line separate, representing the 150 foot depth line, and 3) Pennsylvanian boundary separate.Separates were digitized at the 1:500,000 scale on a GTCO Super L II digitizing board. The black lines were digitized by Sandrine Elinski with a maximum RMS of 0.004. Red lines were digitized by Sandrine Elinski during September, 1995 with a maximum RMS of 0.004. The Pennsylvanian boundary was digitized into a separate coverage by M. Riggs during June, 1995, with a maximum RMS of 0.005.
1. There are township and county boundary arcs on the
published map which are not on the mylars. The
corresponding arcs were copied from the COUNTIES
and TOWNSHIPS coverages in the ISGS /ILLINOIS/ILLIMAP
directory and incorporated into this coverage.
2. The Pennsylvanian boundary arcs were copied into
the coverage.
3. Items for the .PAT and the .AAT files were added
to the coverage.
The .PAT items were:
thick 2 2 i
depth 2 2 i
tons 2 2 i
penn 2 2 i
done 2 2 i
The .AAT items were:
thick 2 2 i
depth 2 2 i
penn 2 2 i
qual 2 2 i
done 2 2 i
The "done" items were used during the attribute coding
phase to indicate whether or not coding of a feature was
complete. When this phase was complete, the "done" items
were deleted from the .PAT and .AAT files.
4. Polygon and arc codes for the coverage were attributed
according to the information depicted on the published
map. In several cases, depth assignments were not obvious
on the published map: in this case the source publications
listed on the published map were consulted in order to
make a depth assignment.
Attribute items are in typical ARC/INFO feature class format.
User-defined attributes are:
Polygon attributes:
THICK - thickness of the coal seam
0 - mined out
1 - coal is greater than 42 inches thick
2 - coal is from 28-42 inches thick
3 - coal is from 18-28 inches thick
4 - insufficient data for resource estimation
or unmapped area
5 - coal split or thin
6 - coal missing due to sandstone channels
7 - coal eroded
8 - not used
9 - outside limit of coal seam
10 - coal deeper than 150 feet and less than 28 inches
thick or coal shallower than 150 feet and less
than 18 inches thick
11 - area of potential resources; resources cannot be
categorized at this scale due to irregularity of thickness
12 - coal less than 42 inches thick;
resources not calculated
DEPTH - depth to the coal body (feet below land surface)
0 - mined out
1 - depth to coal less than 150 feet
2 - depth to coal 150-1000 feet
3 - depth to coal greater than 1000 feet
4 - depth to coal less than 1000 feet
5 - not used
6 - not used
7 - not used
8 - coal not present
9 - outside limit of coal seam
10 - coal deeper than 150 feet and less than 28 inches
thick or coal shallower than 150 feet and less
than 18 inches thick
11 - area of potential resources; resources cannot be
categorized at this scale due to irregularity of thickness
TONS - estimated average tons of coal in millions of tons of
coal per square mile (estimates based on an assumed
coal density of 1800 tons per acre-foot)
1 - less than 4 tons
2 - 4 to 5.5 tons
3 - 5.5 to 7 tons
4 - greater than 7 tons
5 - tonnage not calculated or not applicable
PENN - indicates whether or not polygon is within
Pennsylvanian boundary
0 - polygon is outside Pennsylvanian boundary
1 - polygon is within Pennsylvanian boundary
Arc attributes:
There are four user-defined arc attributes for the coverage.
They are:
THICK - indicates if arc is a coal isopach, and if so, the
thickness value associated with the isopach
0 - arc is not an isopach
1 - 28 inch isopach
2 - 42 inch isopach
DEPTH - indicates if arc is a depth contour, and if so, the
depth value (to the surface of the coal body)
associated with the depth contour
0 - arc is not a depth contour
1 - 150 foot depth contour
2 - 1000 foot depth contour
PENN - indicates whether or not arc is a part of the
Pennsylvanian boundary
0 - arc is not a part of the Pennsylvanian boundary
1 - arc is a part of the Pennsylvanian boundary
QUAL - indicates if arc is represented in coverage
differently than it appears on source map
(qualifier for lines differing from source map)
0 - no qualifier, line appears as a solid line on source map
1 - line is dashed on source map
2 - line does not appear on source map, has been
added in order to close a polygon
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.
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Illinois Natural Resources Geospatial Data Clearinghouse
Generated by mp version 2.8.11 on Mon Jan 29 15:19:33 2007