In levelling, a change point is selected primarily to:
Correct answer: A. Transfer the line of collimation safely
- A. Transfer the line of collimation safely
- B. Measure the horizontal angle between lines
- C. Determine the magnetic bearing of a line
- D. Mark the midpoint of a survey line
Explanation
A change point is a firm point on which a foresight is taken before shifting the instrument and a backsight is then taken. It transfers the level reference from one instrument position to the next, rather than serving as an angle or bearing station.
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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.
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