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Someone suggested that the random pattern ones might be street layouts, possibly of streets like those found in Japanese cities (if you have ever been to Japan you will quickly realize hardly any street layout is a grid).
The circle one with aircraft in the middle is odd, but might be a calibration zone for spy satellites.
The second one I am not sure, but looks like burnt out vehicles. Probably some sort of target range.
The really confusing one is the giant back and forth grid patterns near Lop Nur. Not sure what those are about...
http://maps.google.de/maps?q=44+42'40.81%22N+93+31'46.18%22E&hl=de&ll=44.681104,93.506699&spn=0.095937,0.222988&sll=51.151786,10.415039&sspn=22.253302,53.745117&vpsrc=6&t=h&z=13
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