Question

Scale of a vertical aerial photograph of an undulating terrain is

• A. \( \text{Directly proportional to the height of terrain} \)
• B. \( \text{Inversely proportional to the focal length of camera lens} \)
• C. \( \text{Directly proportional to the flying height of aircraft} \)
• D. \( \text{Uniform throughout the photograph} \)

Hint:

Remember that in aerial photos, higher objects are closer to the camera, resulting in a larger scale.

Answer 1

The Correct Option is A

The scale of a vertical aerial photograph of undulating terrain varies with the height of the terrain. For a given flying height above a datum, points at higher elevations will have a larger scale (appear larger on the photograph) compared to points at lower elevations. Thus, the scale is directly proportional to the height of the terrain relative to the datum.