The lecture I am going to give attempts to cover, inforty-five minutes a subject that really merits aseries of lectures. This, of course, displays afitting disregard for minor difficulties, of which,I am sure, the dauntless spirit of Sir George Cayleywould have approved.

The broad title permits consideration of all methods ofintelligence gathering from the air, including themore widely known optical photographic systems, andhas been deliberately selected for this purpose. Toavoid clumsy and longwinded definitions I willfrequently have recourse to the the use of “in”terms such as Sensor, Multi-Sensor, Exploitation,Environment and many others.