Flights flown between July 6, 1938 and July 25, 1938 by Iowa Aerial Surveys, Inc., for the U. S. Dept. of Agriculture, Agricultural Adjustment Administration. Photos numbered BGM-1-3 through BGM-2-59. Scale not given. Stereoscopic coverage. Only indexes are georeferenced.
Coverage.Spatial
Franklin County (Ill.) (W 89°10′--W 88°42′/N 38°07′--N 37°52′)
Contributing Institution
Illinois State Geological Survey
Format.Use
226 remote-sensing images, 1.59 gigabytes, average file 7.19 megabytes
Format.Creation
Scanned from 9 x 9 contact prints (nominal scale ca. 1:20,000) on Crosfield Celsis 6200 drum scanning system at 750 dpi. Quality assurance target not published but available by contacting the Illinois State Library Map Dept. MrSID files compressed at a target ratio of 6:1. Uncompressed TIFF images on cd available from the Illinois State Library Map Dept.
Relation.Requires
Mode of access: World Wide Web. System requirements: Plug-in or image viewer, ExpressView Browser plug-in available for download. System requirements for interactive map: Internet Explorer best, frames and JavaScript enabled.
