jbot...sorry for the late reply on this thread. I purchased my aerial infrared microfiche from a government agency, located in South Dakota. The IR taken from 20,000 foot worked the best, for my application. You could plainly see stagecoach and buggy ruts, as well as foundation impressions. I was looking for early bridge crossings, and had great success, thanks to the aerial infrared.
HH, Jim
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A) Excellent post SWr, I am in total agreement.
I have used it to locate old mission sites due to the different compactness of the ground.
I would like to add somethng,
IR is effectively heat so you have to protect the flm fro any source of heat.
It cannot be handled or developed just like any ordinary film. Cool is the word.
Till Eulenspeigle - Jose de La Mancha