Consider an infinitely sized square grid pattern (as shown in the figure below) overlaid on a flat ground at an elevation of 120 m above mean sea level. An image is taken by a camera from flying height of 450 m above mean sea level. Assume that the flying height remains constant throughout the operation of the flight. The flying direction is along the line FL, as shown in the figure below. The camera is looking in the off-nadir in the flight direction resulting in a low oblique photograph. Which of the following statements for the resulting low oblique photograph is/are correct?
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In low oblique photography, scale varies across the image and parallelism is not preserved. Horizon is only visible in high oblique images.
Scale of the photograph is not uniform along the flight direction
Parallel lines on the ground do not always appear parallel in the resulting photograph
Horizon is visible in the photograph
Cells A, B and C appear as squares in the resulting aerial photograph
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The Correct Option isA, B
Solution and Explanation
In a low oblique photograph, the camera axis is tilted from the vertical but does not capture the horizon.
The scale is not uniform because of tilt — objects closer to the camera (bottom of the photo) appear larger than those farther away (top of the photo). Hence, (A) is correct. Parallel lines on the ground may not appear parallel in the photograph due to perspective distortion. So, (B) is also correct.
Since it is a low oblique photo (not high oblique), the horizon is not visible, so (C) is incorrect. Squares on the ground appear distorted due to the tilt, hence (D) is incorrect.
