Re: Corona calibration targets

From: William Blair (
Date: Sat Nov 19 2011 - 15:23:07 UTC

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    Confirmed as Corona targets in interesting, short article:
    The February online edition of “Engineer Update” published an article by Mike Tharp of Los Angeles District about a huge grid of mysterious Maltese crosses in the Arizona desert. Research discovered that the project was built to calibrate the cameras of the then-top-secret CORONA spy satellites during the Cold War.
    “They briefed us on a project involving the placement of concrete aerial camera markers at approximately one-mile intervals throughout a 16x16-mile area in and mostly south of Casa Grande, Calif,”
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