I once had the opportunity to work with a “skunk works” group doing competitive analysis. Using commercially available aerial photographs, and with their assistance, I was able to determine the number of people employed, plant capacity, what was being produced,etc. That was 30 years ago.
And today, the CIA can’t tell the difference between a 5’8” man and a 6’8” man? How about the length of his shadow and simple trigonometry?
shoot, thirty years ago, I read where a U2 could tell who was on the mound at Dodger stadium.....from 70000 feet...