In plane table surveying, a trough compass is primarily used to:
Correct answer: D. Determine the approximate magnetic meridian
- A. Measure the vertical angle of a line
- B. Locate a point by double intersection
- C. Measure the length of an offset
- D. Determine the approximate magnetic meridian
Explanation
A trough compass indicates the magnetic north direction and helps orient the plane table approximately. It is not designed for measuring vertical angles or distances.
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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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