Your county FSA office should be able to get you color, aerial phots going back to the early 1980's. They started flying each county on a yearly basis back then. Prior to that they only did 640 scale B&W every 5 years. They had a machine called a "digitizer" where you could find 4 points on the B&W photo, that matched the same 4 points on the color slides flown that year. You projected the color slide on a glass screen on the digitizer. Then you entered the 4 points off of the B&W, then went to the color slide and entered the same 4 points. This gave you a percentage, if the machine accepted the points, then you could measure acres direct off of the color slide projection. This was very helpful in flood years when odd shaped parts of the fields were planted on a contour.
I was trained on this and used this system for 4 or 5 years. Even though we were FCIC employees, the ASCS folks let us use their system cause they didn't want to mess with us.
Depending on the county, they should have these photos/slides stuck in the back room. (maybe)
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