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1937-1947 Illinois Historical Aerial Photography

The following was extracted from the Illinois Geospatial Data Clearinghouse


JPEG File Format

This format is a compressed file with the following file extension .jpg. The original TIFF format files were compressed using Adobe Photoshop CS4 and their Quality setting was set to 10. The average file size is approximately 7.25 megabytes for 7x9 inch photos and 9.25 megabytes for 9x9 inch photos. These files should open in most browsers as they are an open source file format. These files have not been georeferneced.

TIFF File Format

This format is a full resolution file format with the following file extension .tif. These are the original uncompresed files. They were scanned at 750dpi on a Crosfield Drum scanner. The average file size is approximately 36.5 megabytes for 7x9 inch photos and 47.5 megabytes for 9x9 inch photos. These files require a browser plugin to be viewed online. Many software programs will be able to view the images once they are downloaded. These files have not been georeferneced.


https://picasaweb.google.com/114088596394247023766/6314782933776571489?authkey=Gv1sRgCL-6-omjh8zvSA#6600438342124731730 https://picasaweb.google.com/114088596394247023766/6314782933776571489?authkey=Gv1sRgCL-6-omjh8zvSA#6600438377443489122 https://picasaweb.google.com/114088596394247023766/6314782933776571489?authkey=Gv1sRgCL-6-omjh8zvSA#6600438414709366146 https://picasaweb.google.com/114088596394247023766/6314782933776571489?authkey=Gv1sRgCL-6-omjh8zvSA#6600438440010452354


1937-1947 Illinois Historical Aerial Photography


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