smart stuff
Use google maps to study spy satellite calibration
18 Nov 11 - http://www.approximity.com/cgi-bin/blogtariAgile/index.rb/Interesting/satelite_calibration.rdoc
Fun reading:

www.foxnews.com/scitech/2011/11/17/mysterious-symbols-in-china-desert-are-spy-satellite-targets-expert-says/