I have been studying the Cold war actually, and around this period only minor satellites like Sputnik were launched into orbit (before the Americans i hasten to add )...nothing that could map out anything of this detail.
Unbelievable how they had the technology to map the world like that and no one else had in that kind of detail...Mind baffling stuff...When it came to espionage I think the russians really were the masters...And like Ian said there really is so much we still don't know...