These optical targets in the Arizona desert were built for calibrating the cameras of a spy satellite network called the Corona program. Similar to the huge bar codes found across the U.S. southwest, also used for testing high-altitude cameras, these targets are glyphs meant to be seen from the sky: fixed points of focus and orientation for classified machines soaring through space far above.
via Gizmodo http://ift.tt/1qltvGW
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