If the camera is pointed to the zenith or nadir, 'up' and 'down'withThat's why you need the full kaboodle ...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.
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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