Compute the ratio of refraction correction

Reference no: EM131179560

(a) Determine from first principles the approximate distance at which correction for curvature and refraction in levelling amounts to 3 mm, assuming that the effect of refraction is one seventh that of the Earth's curvature and that the Earth is a sphere of 12740 km diameter.

(b) Two survey stations A and B on opposite sides of a river are 780 m apart, and reciprocal levels have been taken between them with the following results:

Compute the ratio of refraction correction to curvature correction, and the difference in level between A and B.

Reference no: EM131179560

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