Which of the following statements is/are false for Parallax? i. The apparent movement of the point under observation with respect to the reference system caused by the movement of the camera position is known as Parallax ii. It is caused by the motion of the point of observation and the difference in elevation between the points observed.
- AOnly (i)
- BOnly (ii)
- CBoth (i) and (ii)
- DNeither (i) nor (ii)Correct
Solution
Concept
Concept of parallax in aerial photogrammetry
Formula
NONE
Step-by-step solution
1. Photogrammetric parallax refers to the apparent shift in position of an object caused by the movement of the camera between image locations. 2. Statement ii incorrectly attributes parallax to the independent motion of the observed point rather than camera baseline shift. 3. Therefore, statement ii is false. Answer: D
Explanation
In photogrammetry, parallax refers to the relative apparent displacement of an object's image caused by a shift in the camera's exposure position along a flight line. This geometric phenomenon is fundamentally driven by the movement of the perspective center and differences in ground elevation across observed points. Because both given statements are true definitions, neither statement is false, making option D correct.
Why the other options are wrong
A) Statement (i) correctly defines parallax as the apparent shift due to camera/observer movement. C) Statement (i) is true, so both statements are not false.
Shortcut
Parallax is caused by camera movement and elevation differences, not target movement.
Common mistake
Selecting option C or B by misidentifying correct statements regarding parallax as false.
Correct answer: D) Neither (i) nor (ii)