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, C. Abert, D. Nelson Documentation: D. Nelson and S. Beaverson Quality Control: ISGS Staff, D. Nelson
Data set was DESCRIBED and coverage files listed to determine the feature types present. In this data set, the following feature types were found and checked: polygons, arcs, labels, nodes, and annotation. The presence of spatial indices was also checked.
For PAT and AAT files, each ITEM was checked for the following:
- DOMAIN of allowable values - adherence of values to the DOMAIN - definition of ITEMS - requirement of all UNIQUE values for an item - logic of ITEMS REDEFINED over other ITEMS - length of ITEM name as regards conversion to shape fileBUILD statuses of data sets were checked, as were LABELERRORS and NODEERRORS (where appropriate), and PROJECTION definition.
The presence of a BND file was verified.
The presence and location of TICS were checked.
Polygon and chain-node topology present. There are no dangling arcs. There is one polygon label per polygon, except for universe polygon. Boundary values appropriate for map projection and map units. "Fuzzy" tolerance is suitable for nominal scale. Several unneeded .AAT and .PAT items were dropped, tics were replaced, and a single polygon was removed. COVER-ID values were recalculated to be unique. See process steps for March, 1998. There are no attribute values outside the appropriate domains.
TICS - The data set had eight tics along the northern border of the state. For better tic distribution, these were replaced with ten tics from *path_name_suppressed*/quad100, evenly distributed around the state. However, users needing registration tics for use with these data (or a subset of these data) should expect to create a task-specific tic set, usually based on section corners.
REMOVAL OF ITEMS - The following empty .AAT items were dropped: STATE2C.OLD#, STATE2C.OLD-ID, ORIG-ID, SYMBOL, SYMB.
UNIQUE COVER-ID VALUES - COVER-ID values in the .AAT and .PAT were calculated to equal (COVER# - 1) in order to make them unique.
EXTRA POLYGON - An extra polygon was removed. TOWNSHIPS# = 876 in .PAT had TWP = '4 2N 2E'. This polygon should actually be a part of the polygon to the immediate west (RE-STATE1# = 57698, TRS = '4 2N 1E25'). The hardcopy version of the USGS Astoria quad is suspected to be in error - the markings are ambiguous. Meridian, township, range and section designation were verified by D. Nelson and C. Abert using 1997 and 1998 plat map books for Mason and Schuyler Counties. The arc that separated the two polygons (TOWNSHIPS# = 2005, and the associated label, were removed. (The ID numbers in this paragraph refer to edition 1.0 of the data, not the current edition. For verification, see the archived data set in *path_name_suppressed*/illimap_v1_0.)
For detailed review see *path_name_suppressed*/illimap_v1_0_rev.txt.
Attribute items are in typical ARC/INFO feature class format.
ARC ATTRIBUTES:
Arc attributes indicate line type. Attribute items other than
the Arc/Info defaults are:
STATELINE - Indicates if arc is a part of the state boundary
1 - arc is part of the state boundary
0 - arc is not part of the state boundary
COUNTLINE - Indicates if arc is a part of a county boundary
1 - arc is part of a county boundary
0 - arc is not part of a county boundary
SECLINE - Indicates if arc is a part of a section line
1 - arc is part of a section line
0 - arc is not part of a section line
INDLINE - Indicates if arc is a part of an Indian Treaty boundary
1 - arc is part of a an Indian Treaty boundary
0 - arc is not part of an Indian Treaty boundary
TOWNLINE - Indicates if arc is a part of a township or range line
1 - arc is part of a township or range line
0 - arc is not part of a township or range line
POLYGON ATTRIBUTES:
Polygon attributes indicate meridian, township, range,
x-coordinates, and y-coordinates. Polygon items other
than the Arc/Info defaults are:
MERIDIAN - The meridian of the township (2, 3, or 4)
TOWNSHIP - The alphanumeric township identifier (1N-46N, 1S-18S)
RANGE - The alphanumeric range identifier (1E-15E, 1W-14W)
X-COORD - X Coordinate of the center of the township in Lambert feet
Y-COORD - Y Coordinate of the center of the township in Lambert feet
** REDEFINED ITEMS **
TWP - The condensed meridian, township and range identifier
TNUM - The numeric township identifier
RNUM - The numeric range identifier
TOWNNUM - The condensed township and range identifier
ANNOTATION ATTRIBUTES:
Annotation attributes indicate the following label items:
Township identification grid
Range identification grid
A text label is given for each Principle Meridian
A text label is given for each Base Line
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
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