A surveyor sets up a total station at a point with a HI of 5.42 ft and sights a rod held on a benchmark (elevation 312.54 ft), reading 3.81 ft. What is the instrument elevation?
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A
318.0 ft (HI = BM + rod reading + instrument height)
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B
Instrument elevation = BM elevation + HI − rod reading
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C
Instrument elevation = 312.54 + 5.42 = 317.96 ft
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D
Instrument elevation = 312.54 + 3.81 = 316.35 ft