Elevation from Backsight and Foresight
Easylevelingelevations
A benchmark has elevation 100.0 m. A leveling setup reads a backsight of 1.5 m on the benchmark and a foresight of 2.2 m on a new point. What is the new points elevation?
- A98.5 m
- B99.3 m
- C100.7 m
- D103.7 m
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Answer: B. 99.3 m
Instrument height = 100.0 + 1.5 = 101.5 m. New elevation = instrument height − foresight = 101.5 − 2.2 = 99.3 m.
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