What is the main purpose of levelling an instrument during its temporary adjustment?
Correct answer: A. To make the vertical axis truly vertical
- A. To make the vertical axis truly vertical
- B. To measure the length of the survey line
- C. To determine the magnetic bearing
- D. To remove local attraction from the compass
Explanation
Levelling makes the vertical axis of the instrument truly vertical and allows the horizontal circle to represent horizontal directions. Magnetic bearing and local attraction are compass-related matters, not purposes of instrument levelling.
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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.
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