In differential levelling, the height of instrument is 210.850 m and the foresight on a point is 2.175 m. What is the reduced level of that point?
Correct answer: A. 208.675 m
- A. 208.675 m
- B. 209.125 m
- C. 213.025 m
- D. 213.675 m
Explanation
Reduced level is found by subtracting the foresight from the height of instrument: 210.850 minus 2.175 equals 208.675 m. Adding the foresight is the common error because a foresight is read downward from the line of sight.
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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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