A theodolite is setup at station A and a 4 m long staff is held vertically at station B. The depression angle reading at 3 m mark on staff is 6°. The horizontal distance between the stations is 2000 m. Height of instrument at A is 1 m and R.L of station A is 800 m.
1
RL of station B neglecting corrections is 587.8 m
2
R.L of station B applying curvature and refraction corrections is 588.06 m
3
R.L of station B neglecting corrections is 587.8 km
4
R.L of station B applying curvature and refraction corrections is 588.06 cm