Illinois Digital Raster Graphics Files
1:250,000 DRGs 1:100,000 DRGs
1:24,000 DRGs Projection/Format
Illinois Natural Resouces Geospatial Data Clearinghouse

Your data bundle will contain five files:

README.txt a text copy of this readme file
<filename>.tif TIFF image
<filename>.tfw Georeferencing file for the TIFF image
<filename>.fgd The original USGS metadata file
<filename>.updated.met An Illinois Department of Natural Resources (IDNR) metadata file describing the modifications (if any) that were made to the original DRG.

Please read the metadata carefully. For in-depth information regarding DRGs, refer to the United States Geological Survey (USGS) DRG Home Page.

This clearinghouse is maintained by the Illinois State Geological Survey.

Illinois Department of Natural Resources | State of Illinois