Discussion
Which of the following aerial photograph will have nadir point, principal point and isocenter all at the same point ?
Answer: D
All three points coincide on a vertical photograph.
The principal point is the centre of the photograph, the nadir point is the point vertically below the camera, and the isocentre lies between them, on the bisector of the angle of tilt. On a truly vertical photograph the camera axis points straight down, the tilt is zero, and the three points fall at the same place.
On low oblique, high oblique and convergent photographs the camera axis is tilted, so the three points separate.
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