Multiple choice

In the context of manual methods of image interpretation, consider the following statements:

  1. In truly vertical photograph, the nadir coincides with the photo's principal point
  2. Straight lines connecting opposite fiducial marks intersect at the principal point. Which of the statements given above is / are correct?

  1. 1 only

  2. 2 only

  3. Both 1 and 2

  4. Neither 1 nor 2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Both statements are correct in photogrammetry. In a truly vertical photograph, the nadir point (point directly below the camera) coincides with the principal point (optical center). Fiducial marks are reference marks on the photograph, and lines connecting opposite fiducial marks intersect at the principal point.

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