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. Red and black lines were digitized by D. Nelson during February and March, 1995, with a maximum RMS of 0.008. The Pennsylvanian boundary was digitized into a separate coverage by M. Riggs during June, 1995, with a maximum RMS of 0.005. Inset areas of the map were digitized into a separate coverage by D. Nelson, with a maximum RMS of 0.008.
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 *path_name_suppressed*/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.
5. During the process the coverage was BUILT and
CLEANED several times. See LOG file for tolerances used.
6. The coverages at this point were CM4 (main map) and
CMINSET (inset portion). The lineage at this point was
COALMIX-DIG > COALMIX-WRK > CM2 > CM3 > CM4 for the main
map and COALMIX2-DIG > CMINSET for the inset map.
7. The inset coverage has polygons that overlap polygons
on the main map coverage, which is why they were
digitized and processed as two separate coverages. In
order to join them into a single coverage, the Regions
subclass function of Arc/Info was utilized. First, each
of the 15 coal seams indicated on the published coal
resource map was copied out from the CM4 or CMINSET
coverage to its own coverage. The remaining areas were
copied out to a coverage called NOCOAL. This resulted in
16 separate coverages, corresponding to the 15 coal bodies
and the no-coal area. Each of these was converted to a
region sub-class with the POLYREGION command. Next, the
16 coverages were UNIONed to create a coverage called
COALREG which contained the 16 regions with region
topology. Next, CM4 and CMINSET were APPENDed to create
the coverage CMARC, which has all the arc topology of both
coverages. At this point, COALREG had the region topology
and CMARC had the arc topology. Finally, CMARC was copied
to a new coverage called CMIX. The 16 regions were created
in CMIX with the CREATEFEATURE command. Each of the 16
regions was PUT from COALREG into CMIX. The final result
was the the coverage CMIX with both arc and region topology.
8. The coverage was renamed COALMIX-84.
9. ITEM CBN (coal seam name) was added to .PAT table for
all regions. ITEM QUAL was added to .AAT table for the
coverage.
REGIONS
-----------------------------------------------------------
Arc/Info Coal represented
region
sub-class name
ASSUMP Assumption
DAVIS Davis
HOUCHIN Houchin Creek (formerly Summum (No. 4))
LITCH Litchfield
MAKANDA coals near Makanda
MTRORAH Mt. Rorah
MURPHY Murphysboro
NOCOAL areas on source map without coal
REYNOLDS Reynoldsburg
ROCKISLE Rock Island (No. 1)
SEAHORNE "Seahorne"
SEELY Seelyville
SURVANT Survant (formerly Shawneetown)
WILEY Wiley
WILLIS Willis
WISERIDG Wise Ridge
Region attributes:
For the region .PATs (there is a separate one for each region)
there are four items in addition to the four standard items.
They are:
THICK - thickness of the coal body
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
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
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
CBN - coal seam name
Arc attributes:
There are arc attributes for the entire coverage. There are
no arc attributes for the individual regions. There are four
items in addition to the standard ones. 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 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
Note:
There are 25 dangling arcs in this coverage. These
correspond to 25 of the 31 dangling arcs on the original
mylars and the published map. Most of them are incomplete
150 foot depth contour lines.
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Illinois Natural Resources Geospatial Data Clearinghouse
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