- Flown July and August 1939, USDA funded project
- Usage Scale 1” = 400’
- Black and white
- Ortho corrected
- Illinois State Plane, Eastern Zone, NAD 83 horizontal datum, HARN
- MrSID image file format
- More detailed information
This is Lake County's oldest countywide aerial photography. It was flown in July and August of 1939, part of a national project funded by the U.S. Department of Agriculture. A cooperative project between the Lake County GIS group and the Illinois State Geological Survey transformed the paper prints into a seamless countywide image. This aerial photography has an intended usage scale of 1" = 400' (one inch on the photograph equal to 400 feet on the ground). The photography has been ortho corrected; however, full, modern orthorectification was not possible due to lack of information about the camera used and other factors.
This digital aerial photo product consists of a single, countywide image in an image compression format called MrSID.
For more information about the MrSID file format visit the Lizardtech website.
A standalone MrSID viewer is included on each compact disc, which can be installed on a personal computer to look at the image. Documentation for the viewer is included on the compact disc.
Lizardtech offers free extensions for CAD, GIS and image software at their website.
1939 aerial photo sample, showing the Six Flags Great America site.