Posted by GeneMO on December 14, 2008 at 17:34:09 from (216.74.221.122):
In Reply to: O/T: Vintage Aerial Photos posted by Blue3992 (Northern IL) on December 14, 2008 at 16:44:23:
Check with you local county Farm Service agency office. I worked for them in the mid 70's. They kept black and whites of the whole county. In the early 80's they went to color slides, but every 5 or 6 years would get a new set of the black and whites. For their digitizer to accurately measure acres off of the color slides,you still needed the black and white photos. You had to find 4 corresponding point on the color, then the same 4 on the B&W. Enter that into the machine, then you could measure the acreage direct off of the color slide as it was projected on the backside of a piece of glass on the machine. I know when I was there they had black and whites going all the way back to the 30's
You could also order you own from a govt. agency in Salt Lake City.
I dont think they keep any large B&W anymore as satelite photos on the internet have made them obsolete. If you know someone in those offices you could probably talk them out of them. If they still have the color slides they used in the 80's you can get copies made.
The NRCS office might be another source and in the same building.
I have the large B&W's of our places that were taken in 1958. Fun to compare things.
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