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Surveying - Engineering

Q1:

If L is in kilometres, the curvature correction is

A 58.2 L2 mm

B 64.8 L2 mm

C 74.8 L2 mm

D 78.4 L2 mm.

ANS:D - 78.4 L2 mm.

Correction for curvature, CC = 0.07849 L^2.
Where L is in meters. and CC in meter.
CC = 0.07849*L^2*10^3 mm.
= 78.49*L^2 mm. For curvature =L^2/2R = 0.07858L^2.
For Refraction =1/7 * L^2/2R.