In a plane table survey, the orientation of the table by backsighting is carried out mainly to:
Correct answer: A. Make the table parallel to its former position
- A. Make the table parallel to its former position
- B. Measure the length of a ray
- C. Determine the reduced level of a point
- D. Locate the magnetic meridian directly
Explanation
Backsighting rotates the table until a previously plotted line aligns with the corresponding ground line. This restores the table to an orientation parallel to its position at the earlier station.
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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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