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    Re: Digital Image CN Exercise
    From: Marcel Tschudin
    Date: 2010 Apr 7, 16:41 +0300

    Greg,
    
    The height of eyes and the distance to the oil rig are so small that a
    more detailed calculation doesn't result in a noticeable different
    height of the oil rig than what you obtained by using the Bowditch
    formula.
    
    After correcting the program, the result has slightly improved. Loc 1
    has shifted by about 500m to 600m towards north from its previous
    position. The azimuth line from this point passes Gilda now between
    0.9 km to 1 km south of it. However, for some unknown reasons I obtain
    now a minutely larger azimuth which shifts the expected photo-location
    further south by about an additional 100m. I didn't expect such a
    difference in azimuth from those modifications. So, I still have
    something to search for.
    
    BTW, what program did you use for these calculations? May be the one
    where you showed an input form?
    
    Thank you for the details on the Pacific Brown Pelican. Its really a
    nice bird. I leave it however to you to calculate its distance by
    estimating the projection angle and the ratio actual vs. average wing
    span.
    
    Thank you, Greg, for this exercise which helped me to verify parts of
    my program. It also may have shown to the other members of NavList how
    the location can be found from a timed photo.
    
    Marcel
    
    
    
    

       
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