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Find the elevation of ground beneath the reflector, if the known elevation of instrument is 12.76m, slope distance = 3.76m, angle is about 3˚43ꞌ, instrument height = 2.93m, ground is at 0.987 m.

Find the elevation of ground beneath the reflector, if the known elevation of instrument is 12.76m, slope distance = 3.76m, angle is about 3˚43ꞌ, instrument height = 2.93m, ground is at 0.987 m. Correct Answer 18.45m

The elevation of ground beneath the reflector can be given as Rz = Iz + Sd * cosZa + Ih – Rh. On substitution, we get Rz = 12.76 + (3.76*cos (3˚43ꞌ)) + 2.93 – 0.987 Rz = 18.45 m.

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