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    Re: Digital Image CN Exercise
    From: Greg Rudzinski
    Date: 2010 Apr 6, 12:44 -0700

    Marcel,

    See the link to chart 18725 for my actual plot which shows the position of the photographer, the assumed position, and a fix using a bearing from platform Gilda and the Sun LOP. Also see the screen picture result of Henning Unlands V1.50 online sight reduction calculator.

    To get the height of the platform above sea level given a 13ft. height of eye and a 9.2 nautical mile range to platform Gilda:

    TAN(115 pixels x .097' minutes per pixel/60) x (9.2 nautical miles x 6076.1 feet) = 182 ft.
    (add 20 ft. height below the visible horizon which is a #8 table look up in the 1975 Bowditch.)
    The total height above sea level is then 202 ft.

    For the ornithology challenge see the attached photo hint ;-)

    GRudzinski
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