Hidden Bibliographic Details
| Varying Form of Title: | DOQ's at ISL
Digital orthophotoquads at the Illinois State Library
Illinois digital orthophotoquads index
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| Notes: | Cover title.
"August 2003."
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| Summary: | The Illinois State Library (ISL) owns all of the U.S. Geological Survey Digital Orthophotoquads (DOQ) for Illinois. These DOQs are in GEO TIFF format and are based on all three NAPP (National Aerial Phtography Program) flights in Illinois: 1988, 1993 and 1998. Since the DOQs are arranged on CD-ROM by file number (not alphabetically by quad name or by the 5 digit block number from the topographic map index), library staff have created this alphabetical finding guide, which translates the quad name to CD file number.
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| Target Audience: | Index refers only to the ISL map collection and is not intended to provide information on similar items at other locations.
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