A backsight is taken on a benchmark of rod reading of 1.30 meters, vertical angle of 22° 30’, and slope distance distance from instrument of 57.6 m. A foresight is taken on a point A with rod reading of 0.80 m., vertical angle of 8° 15’, and a horizontal distance of 40.50 m from the instrument. If the height of instrument is 1.20 m. having a ground elevation of 537.98 m., determine the elevation BM and point A disregarding the effect of curvature and refraction.

A backsight is taken on a benchmark of rod reading of 1.30 meters, vertical angle of 22° 30’, and slope distance distance from instrument of 57.6 m. A foresight is taken on a point A with rod reading of 0.80 m., vertical angle of 8° 15’, and a horizontal distance of 40.50 m from the instrument. If the height of instrument is 1.20 m. having a ground elevation of 537.98 m., determine the elevation BM and point A disregarding the effect of curvature and refraction.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter14: Highway Surveys And Location

Section: Chapter Questions

Problem 12P

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