Illinois State Geological Survey 1984, 199803 1.1 map ISGS GIS Database townpts Champaign, Illinois Illinois State Geological Survey Downloadable Data (Shift-Click to download data file) <URL:http://www.isgs.uiuc.edu/nsdihome/browse/statewide/townpts.e00> Browse Graphic (GIF) Screen-size image representing the nature of the data. <URL:http://www.isgs.uiuc.edu/nsdihome/browse/statewide/townptsb.gif> Text (.txt) version of this Metadata file. (Shift-Click to download documentation) <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/townpts.txt> HTML (.html) version of this Metadata file. (Shift-Click to download documentation) <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/townpts.html> This is an Arc/Info point coverage of township center points in Illinois. Points are labeled with meridian, township, range, and approximate x and y coordinates in Lambert feet. 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, an unneeded .PAT item was dropped, tics were replaced, two points were removed, and COVER-ID values were recalculated to be unique. 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 -91.41291778 -87.43823175 42.47190741 36.96026498 none public land survey township range 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 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 townships Champaign, Illinois Illinois State Geological Survey Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/townships.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 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: points. The presence of spatial indices was also checked. For PAT 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. Point topology present. There is one point for each corresponding polygon in *path_name_suppressed*/townships. Boundary values are appropriate for map projection and map units. "Fuzzy" tolerance is suitable for nominal scale. Two unneeded points were dropped, one .PAT item was dropped, and tics were replaced. COVER-ID values were recalculated to be unique. See process steps for March, 1998. There are no attribute values outside the appropriate domains. This data set contains one center point for each township in Illinois. These points were centered on township polygons in the ISGS GIS database coverage re-state1 using the ARC/INFO CREATELABELS command. They are intended for general centering of map labels. No specific determination of horizontal positional accuracy is available. These points do not represent an accurate physical ground condition. Illinois State Geological Survey 1984 map ISGS GIS Database re-state1 Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/re-state1.html> 24000 and 62500 ARC/INFO GIS data set 1984 publication date none Calculated township centers based on digitized 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 using the ARC/INFO CREATELABELS command. 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 four tics well placed around the state. To conform with other illimap data sets, however, these were replaced with ten tics from *path_name_suppressed*/quad100, evenly distributed around the state. These provide a slightly better tic coverage. 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 - .PAT item TRS was removed. It is a remnant from coverage RE-STATE1 that is not necessary in this data set. UNIQUE COVER-ID VALUES - COVER-ID values in the .PAT were calculated to equal (COVER# - 1) in order to make them unique. EXTRA POINTS - Two extra points were removed. TOWNPTS# = 876 in .PAT had TWP = '4 2N 2E'. This point should actually be a part of the polygon to the immediate west (RE-STATE1# = 57698, TRS = '4 2N 1E25'). See metadata for RE-STATE1 or TOWNSHIPS for a complete explanation. 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. TOWNPTS# = 1 was also removed. This point relates to the universe polygon in TOWNSHIPS, but is not a township center point. (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 Point Point 1764 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. > > POINT ATTRIBUTES: > Point attributes indicate meridian, township, range, > x-coordinates, and y-coordinates. Point items other > than the Arc/Info defaults are: > MERIDIAN - The meridian of the township > TOWNSHIP - The alphanumeric township identifier > RANGE - The alphanumeric range identifier > 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 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.) 19980324 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