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Trigonometric levelling is also called:(a) Indirect levelling(b) Differential levelling(c) Fly levelling(d) Profile levellingI have been asked this question in an interview.This intriguing question originated from Methods of Levelling in portion Basic Surveying of Basic Civil Engineering

Answer»

Correct choice is (a) Indirect levelling

Easiest explanation: In trigonometric levelling, the horizontal DISTANCE and VERTICAL angle are measured from the station to the object. It uses trigonometric relations to compute the vertical HEIGHT of a POINT.



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