This metadata file describes a suite of USGS DRGs in Illinois that have been reprojected to a Lambert Conformal Conic Projection. This set is commonly referred to as "Lambert projection, collar intact." With the exception of projection, the images are identical to those distributed by the USGS. Horizontal datum is NAD27. Map units are feet. The new projection information included in this metadata file supersedes that specified at the lower left on the collar of the map image. Each image has an associated georeferencing file with a .tfw extension.
The naming convention conforms to that used by the USGS.
The Illinois Department of Natural Resources does not maintain a separate metadata file for individual DRGs. This metadata file applies to all the images in this set.
This set currently includes 7.5-minute (1:24,000 scale) DRGs.
Note that the bounding coordinates reported below are for the entire state of Illinois, not for any single quadrangle.
USGS DRG Color Palette
Digital Number Color Red Green Blue
0 Black 0 0 0
1 White 255 255 255
2 Blue 0 151 164
3 Red 203 0 23
4 Brown 131 66 37
5 Green 201 234 157
6 Purple 137 51 128
7 Yellow 255 234 0
8 Light Blue 167 226 226
9 Light Red 255 184 184
10 Light Purple 218 179 214
11 Light Grey 209 209 209
12 Light Brown 207 164 142
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.
Illinois Natural Resources Geospatial Data Clearinghouse
Generated by mp version 2.8.11 on Mon Jan 29 15:19:35 2007