Illinois State Geological Survey 199210, 199803 1.1 map ISGS GIS Database quad75 Champaign, Illinois Illinois State Geological Survey Downloadable Data (Shift-Click to download data file) <URL:http://www.isgs.uiuc.edu/nsdihome/browse/statewide/quad75.e00> Browse Graphic (GIF) Screen-size image representing the nature of the data. <URL:http://www.isgs.uiuc.edu/nsdihome/browse/statewide/quad75b.gif> Text (.txt) version of this Metadata file. (Shift-Click to download documentation) <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/quad75.txt> HTML (.html) version of this Metadata file. (Shift-Click to download documentation) <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/quad75.html> This Arc/Info data set shows boundaries of 7.5' (1:24,000 nominal scale) quadrangles in Illinois. Polygon, arc and annotation feature classes are included. Each side of a quadrangle is composed of a single arc, subdivided into 5 arc segments of 1.5' each. There is a tic for each quadrangle corner. Boundaries and tics were generated with version 7.1.1 of the Arc/Info software from a file of decimal degree locations for each quadrangle corner, using the GENERATE command. These data are in a Lambert Conformal Conic projection and coordinate units are feet. Tabular data for quadrangle polygon include quadrangle name and USGS map designation code. Each quad is annotated with its name. Tabular data for the arcs include latitude or longitude in decimal degrees. This data set was created to serve as base map information. Data are appropriate for use at a regional scale and are intended as a reference. Data are not appropriate as a geodetic or engineering base. Updates to this edition: Tics and arcs have been regenerated. Tics have been added at every quadrangle corner. Vertices have been added to every arc at 1.5' intervals to reduce shape changes due to projection of the data. Arcs and polygon topology have been added for the Danby quad in southwestern Illinois, increasing the number of quadrangles to 1072. Two attribute values have been corrected. Arcs are coded with latitude or longitude in decimal degrees. See process step entries dated March 1998 for more details. This data set is a subset of a master data set called QUADTILE that contains boundaries for all 7.5' quadrangles from 36 to 43 degrees north latitude and 87 to 92 west longitude. Arcs from QUADTILE can also be used to produce statewide base maps for 15' (1:62,500 scale), 30' x 60' (1:100,000), and 1 degree x 2 degree (1:500,000) quadrangles. publication date n/a - These data are a mathematical construct unrelated to ground condition. Complete every two years -91.5336 -87.2490 42.6108 36.8568 none boundary quadrangle 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 >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 199803 map ISGS GIS Database quadtile Champaign, Illinois Illinois State Geological Survey Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/quadtile.html> Illinois State Geological Survey 199803 map ISGS GIS Database quad15 Champaign, Illinois Illinois State Geological Survey Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/quad15.html> Illinois Geographic Information System 199403, 199803 map IGIS GIS Database quad100 Champaign, Illinois Illinois Geographic Information System Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/quad100.html> Illinois Geographic Information System 199403, 199803 map IGIS GIS Database quad250 Champaign, Illinois Illinois Geographic Information System Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/quad250.html> No formal review has been completed. Regular use of these data, however, indicate attributes are accurate. 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. Some minor attribute errors were found and corrected. Two polygons had MAPNAME = CLINTON. The one on the state boundary was renamed CLINTON IA-IL. There are no attribute values outside the appropriate domains. All quadrangles that intersect the state of Illinois are included. These data are a mathematical construct and as such should have a high degree of positional accuracy. No review has been completed, however. There have been several instances where these boundaries have been used with other data digitized from USGS quadrangles with good results. Boundaries were generated by version 5.0 of the ARC/INFO software from a file of degree minute second locations for each quadrangle corner, using the GENERATE command. 199210 Boundaries were regenerated by version 7.1.1 of the Arc/Info software from a file of decimal degree minute second locations for each quadrangle corner, using the GENERATE command. New tics were generated as well, one at each quad corner. Latitude and longitude values were assigned to the arcs in the generation process. The result was a parent coverage called QUADTILE. The data were projected to Lambert Conformal Conic. Arcs forming quadrangle boundaries for any 7.5 minute quadrangles intersecting Illinois were extracted to this data set. Polygon labels and annotation from edition 1.0 were retained. Internal logical consistency checks were made as described in the logical consistency report. Differences between this edition (1.1) and the previous edition (1.0) are: Tics and arcs have been regenerated. Tics have been added at every quadrangle corner. Vertices have been added to every arc at 1.5' intervals to reduce shape changes due to projection of the data. Arcs and polygon topology have been added for the Danby quad in southwestern Illinois, increasing the number of quadrangles to 1072. Two attribute values have been corrected. (1) There were two quadrangle with MAPNAME = "CLINTON". The one on the Illinois-Iowa border was changed to "CLINTON IL-IA". (2) There was a value in the item USGS that contained a dash rather than a dot. This was corrected to conform with the correct format for this field. For detailed review see *path_name_suppressed*/quads_v1_0_rev.txt. 199803 Vector Point 1072 String 2233 GT-polygon composed of chains 1073 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. > Those requiring additional explanation are: > > POLYGON ATTRIBUTES: > MAPNAME - Name of the associated USGS 7.5 x 7.5-minute quadrangle > > USGS - USGS map sheet index designation. This is an alphanumeric > combination of degrees north and west with a row column > index applied to each 1 degree by 1 degree area. > > ARC ATTRIBUTES: > COORD - The latitude value for east-west arcs or the longitude > value for north-south arcs. Values are in decimal degrees. > COORD is redefined into two smaller fields: > > INTEGER - The value of COORD to the left of the decimal. > (The value of COORD rounded down to a whole number.) > > DECIMAL - The value of COORD to the right of the decimal. > (The incremental fraction of COORD.) > > Q15 - Indicates if arc is also a boundary for a 15 minute quad. > 0 - arc is not a 15 min. quad boundary > 2 - arc is a 15 min. quad boundary > > Q100 - Indicates if arc is also a boundary for a 30 x 60 minute quad. > 0 - arc is not a 30 x 60 min. quad boundary > 2 - arc is a 30 x 60 min. quad boundary > > Q250 - Indicates if arc is also a boundary for a 1 x 2 degree quad. > 0 - arc is not a 1 x 2 degree quad boundary > 2 - arc is a 1 x 2 degree quad boundary > > ANNOTATION ATTRIBUTES: > Each quad is annotated with the quad name diagonally from > southwest to northeast. 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