At 8:46 AM +0000 1/2/05, Bob Talbot wrote:

If the camera is pointed to the zenith or nadir, 'up' and 'down'
with
 respect to points on the picture plane is meaningless. Also, of
 course, gravity sensors relating to that picture plane won't work,
 and that is quite logical.
That's why you need the full kaboodle ...

Why?

There is no up or down to a picture if pointed at the zenith or nadir, so any such tag, however created, would be nonsense.

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   *            Henning J. Wulff
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