In aerial photogrammetry, parallax is primarily used to determine:
Correct answer: C. Relative elevation or height difference
- A. Magnetic bearing
- B. Atmospheric pressure
- C. Relative elevation or height difference
- D. Instrument bubble sensitivity
Explanation
The change in apparent position of an image between overlapping photographs is parallax, and its magnitude is related to the relative height of points. Greater measurable parallax generally indicates a difference in elevation.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Surveying
Surveying covers measurement of distances, angles and elevations, traversing, levelling, contouring, plane table work, theodolites, total stations and basic photogrammetry. It includes error adjustment, coordinate calculations, area and volume determination, and the distinction between accuracy and precision, as well as between temporary and permanent adjustments.
Practise Surveying
77 free Surveying MCQs from Civil Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Civil Engineering questions like this
Civil Engineering is on 3 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Surveying questions
What is the principal purpose of centring a theodolite during its temporary adjustment?
In plane table surveying, the radiation method is most suitable when the details are located:
On a map, two consecutive contour lines have elevations of 120 m and 125 m. What does the difference of 5 m represent?
Which method is commonly used to reduce the effect of collimation error when levelling across an obstacle?
What is the main purpose of levelling an instrument during its temporary adjustment?
In the repetition method of measuring a horizontal angle with a theodolite, the main benefit is to: