The data were projected to Lambert Conformal Conic. Arcs forming quadrangle boundaries for any 15 minute quadrangles intersecting Illinois were extracted to this data set. Polygon labels and annotation for each quad were added. Internal logical consistency checks were made as described in the logical consistency report. This is an alphanumeric combination of degrees north and west with a row column index applied to each 1 degree by 1 degree area.
Values are in decimal degrees.
Q100 - Indicates if arc is also a boundary for a 30' x 60' quad. 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.