1. a) Correct the observed altitude for the height of signal, refract…

Question

1. a) Correct the observed altitude for the height of signal, refraction and curvature from the following data.

Observed altitude = +4°48'39"

Height of signal = 5.00 m

Height of instrument = 1.20 m

Coefficient of refraction = 0.07

R sin 1" = 30.88

Horizontal distance = 5200m

b) What is axis signal correction? Obtain expression for axis signal correction.