Re: Corona calibration targets

From: William Blair (
Date: Fri Nov 18 2011 - 19:59:02 UTC

  • Next message: William Blair: "Re: Corona calibration targets"

    > Very interesting. Any idea where the association of
    > these targets with Corona comes from? That is, was the photographer
    > involved during the program, did he/she find documents identifying them,
    > etc.?
    I first saw mention of them here today:
    (About mysterious man-made ground patterns seen in China via Google Earth) "It turns out that they are almost definitely used to calibrate China's spy satellites.
    So says Jonathon Hill, a research technician and mission planner at the Mars Space Flight Facility at Arizona State University, which operates many of the cameras used during NASA's Mars missions. Hill works with images of the Martian surface taken by rovers and satellites, as well as data from Earth-orbiting NASA instruments.
    In fact, the U.S. also uses calibration targets. "An example I found just now is a calibration target for the Corona spy satellites, built back in the 1960s, down in Casa Grande, Ariz., [at coordinates] 32 48' 24.74" N, 111 43' 21.30" W," Hill told Life's Little Mysteries, a sister site to LiveScience.
    End excerpt.
    Plus there's a now dead link in the first comment found here on the target/marker photo page:
    It's associated with the text "Cold War veteran shares memories of CORONA grid" and this link:
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