Question

Which of the following statement is NOT true regarding relief displacement in vertical photographs in the context of aerial photogrammetry?

• A. \( \text{Relief displacement is the shift in the photographic position of an object caused by the elevation of the object (above or below the datum)} \)
• B. \( \text{Relief displacement is always in non-radial direction from the principal point} \)
• C. \( \text{Relief displacement can cause straight roads (not passing through the ground principal point) to appear crooked in undulating terrain} \)
• D. \( \text{The magnitude of relief displacement is affected by the flying height of the camera (assuming everything else to be same)} \)

Hint:

Remember that relief displacement is radial from the principal point.

Answer 1

The Correct Option is B

Relief displacement is the shift in the photographic position of an object caused by its elevation. Relief displacement is radial from the principal point, not non-radial. Relief displacement can cause straight roads to appear crooked in undulating terrain. The magnitude of relief displacement is affected by the flying height of the camera.