1998 - 2001 Illinois Digital Orthophoto Quadrangle (DOQ) Data

Data

Summary

Illinois National Aerial Photography Program (NAPP) Digital Orthophotography quarter Quadrangle (DOQ) data have been created for 102 counties in the Universal Transverse Mercator (UTM) coordinate system with a NAD83 datum. Data were created using USGS NAPP specifications using black and white film during the leaf-off periods of spring, 1998, 1998, 2000, and 2001 at a 1 meter by 1 meter resolution.

Metadata

Data

Compressed Data

Map of 1998 - 2001 DOQ Data by Year of Image Capture Map Legend: Year of Image Capture (1994, 1996, 1998, 1999, 2000 and 2001) Data files are offered as LizardTech's MrSID (first generation) .sid files; file processing included image enhancement using PCI. Target compression ration was 15:1 one compressed file is roughly 3 megabytes in size.

A statewide collection of 1998 - 2001 NAPP data requires about 11.5 Gigabytes of storage space. We do not plan to distribute compressed data files by any other means (cd-rom, zip drives, portable drives, ftp download, etc)

Uncompressed Data

Contact the Illinois State Library to obtain indiviual, uncompressed Illinois 1998 - 2001 DOQ data files.

Metadata:

doqmeta.zip contains:
doqgenrl.html, a generic .html metadata file
doqindex.dbf, a DOQ-specific .dbf table of attribute descriptions, with
readmedoq.htm, a corresponding .htm file outlining the dbf file headers.

Resources:
Files are named by USGS index number.

Data meet USGS National Map Accuracy Standards (NMAS) for aerial photography at 1:12,000; Map applications up to 1:4,800 can be supported, but NMAS are not maintained at that scale.

Zip Data:

doqmeta.zip

Services

http://data.isgs.illinois.edu/arcgis/rest/services/Imagery/IL_NAPP_1998/ImageServer

Viewer

Project Sponsors

Project Sponsors:

Illinois State Geological Survey

University of Illinois Urbana-Champaign

Illinois Council on Food and Agricultural Research

Illinois Department of Natural Resources

Illinois Sustainable Technology Center

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Data

Compressed Data

Uncompressed Data

Zip Data:

Project Sponsors: