What is the main purpose of taking reciprocal levels across a river or valley?
Correct answer: D. To eliminate errors from unequal sight lengths
- A. To determine magnetic declination
- B. To calculate the traverse bearing
- C. To increase the contour interval
- D. To eliminate errors from unequal sight lengths
Explanation
Reciprocal levelling uses observations from both sides of an obstacle, so errors caused by collimation, curvature and refraction are largely cancelled. It does not determine magnetic declination or traverse bearings.
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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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