Illinois State Geological Survey 1984, 199803 1.1 map ISGS GIS Database townships Champaign, Illinois Illinois State Geological Survey Downloadable Data (Shift-Click to download data file) <URL:http://www.isgs.uiuc.edu/nsdihome/browse/statewide/townships.e00> Browse Graphic (GIF) Screen-size image representing the nature of the data. <URL:http://www.isgs.uiuc.edu/nsdihome/browse/statewide/townshipsb.gif> Text (.txt) version of this Metadata file. (Shift-Click to download documentation) <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/townships.txt> HTML (.html) version of this Metadata file. (Shift-Click to download documentation) <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/townships.html> This is an Arc/Info polygon and arc data set that contains township and range lines in Illinois. Individual townships are labeled with meridian, township, and range designations, and with x and y coordinates of the approximate section center point. Nominal scale is 1:62,500. This data set was created to serve as base map information at scales of 1:62,500 or smaller. Attribute data identify township and range. These data are appropriate for use in local and regional thematic analysis. Data are not appropriate as a geodetic or engineering base. Updates to the data: Edition 1.0 of these data were reviewed for internal logical consistency in March, 1998. As a result, one unneeded .PAT items was dropped, tics were replaced, and COVER-ID values were recalculated to be unique. An extra polygon was also removed. See logical consistency report and process steps for March, 1998 for more details. The updated data set (this one) is edition 1.1. 1984 Data were digitized from USGS 7.5 minute and 15 minute topographic maps available circa 1984. Range of dates of those source maps is unknown. Complete Every two years -91.4244 -87.3840 42.4951 36.9540 none public land survey township range boundaries illimap base map none Illinois 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 the appropriate custodial division within 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. These data are not to be used for commercial profit. Illinois State Geological Survey Information Office mailing and physical address

615 East Peabody Drive

Champaign Illinois 61820 USA 217-333-4747 217-785-0211 217-244-0802 isgs@isgs.uiuc.edu 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time >GIS Processing: ISGS Staff, C. Abert, D. Nelson >Documentation: D. Nelson and S. Beaverson >Quality Control: ISGS Staff, D. Nelson ARC/INFO version 7.1.1 software for UNIX, with no8.3 setting. Illinois State Geological Survey 1984, 199803 map ISGS GIS Database re-state1 Champaign, Illinois Illinois State Geological Survey Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/re-state1.html> Illinois State Geological Survey 1984, 199803 map ISGS GIS Database state Champaign, Illinois Illinois State Geological Survey Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/state.html> Illinois State Geological Survey 1984, 199803 map ISGS GIS Database counties Champaign, Illinois Illinois State Geological Survey Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/counties.html> Illinois State Geological Survey 1984, 199803 map ISGS GIS Database townpts Champaign, Illinois Illinois State Geological Survey Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/townpts.html> Illinois State Geological Survey 1984, 199803 map ISGS GIS Database indianlns Champaign, Illinois Illinois State Geological Survey Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/indianlns.html> This coverage was extracted from coverage re-state1, the primary public land survey data set in the ISGS GIS database. The attributes of that coverage were reviewed in 1990 using a variety of visual techniques (polygon shading, line shading and line thicknesses tied to attribute values) and GIS processing techniques (checking for logical consistency). See the metadata for re-state1 for a more complete description of this review. There is no quantitative assessment of attribute accuracy available, however, this coverage has been used extensively by ISGS personnel since 1984, and it can be assumed most attribute errors have been detected and corrected. There are no arc, polygon or annotation attribute values outside the appropriate value domains. A logical consistency review was performed in March, 1998. The following checks were made: 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 file BUILD 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. In 1995, the state boundary along the Ohio River was officially changed, but these changes have not been incorporated. Also, this coverage does not include the portion of the state boundary that extends into Lake Michigan. Rather, the lake shore is depicted as the state boundary. Horizontal positional accuracy is spot verified by manual overlay of source and hard-copy plots. Arcs within line-width of source maps are deemed acceptable. For positional accuracy of source maps, contact the USGS. United States Geological Survey unknown map Topographic quadrangles Those which depicted a portion of Illinois township and range lines at time of automation (1984). 24000 and 62500 paper unknown unknown publication date none Lines depicting Illinois township boundaries This is a legacy data set compiled circa 1984. It is assumed that the automation process was typical of that for Arc/Info geo-data sets, implying digitization from source maps, editing and error checking, building topology, and subsequent revision and update. This coverage was extracted from parent coverage re-state1. See metadata for re-state1. Specific process descriptions prior to 1997 are unavailable, other than those listed in the associated Arc/Info log file. 1984 An internal logical consistency check was performed in March, 1998. See entry for logical consistency. As a result, the following changes/updates were made to the data: 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. 199803 Vector Point 1764 String 4225 GT-polygon composed of chains 1765 Lambert Conformal Conic 33 0 0.000 45 0 0.000 -89 30 0.000 33 0 0.000 914400.00000 meters 0.00000 coordinate pair unknown unknown feet NAD27 CLARKE1866 6378206.4 meters 294.98 > 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 none Illinois State Geological Survey Information Office mailing and physical address

615 East Peabody Drive

Champaign Illinois 61820 USA 217-333-4747 217-785-0211 217-244-0802 isgs@isgs.uiuc.edu 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time 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. An Arc/Info .e00 (export) file is currently available free of charge at the Illinois Natural Resources Geospatial Data Clearinghouse. Refer to the Citation Information portion of this file for access to downloadable data and metadata, and a visual (GIF image) representation of the data. Shift-click to download the data set and related documentation. (Data and metadata offered separately, please download both files.) 19980331 19980331 200003 Illinois State Geological Survey Information Office mailing and physical address

615 East Peabody Drive

Champaign Illinois 61820 USA 217-333-4747 217-785-0211 217-244-0802 isgs@isgs.uiuc.edu 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 none none