man standing on the ground can see just the tip of a tower 25km away. If the eye of the man is 1.8m above sea level, determine the height of the tower above sea level considering curvature and refraction correction.

man standing on the ground can see just the tip of a tower 25km away. If the eye of the man is 1.8m above sea level, determine the height of the tower above sea level considering curvature and refraction correction.

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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Concept explainers

Methods of Surveying

Surveying is the practice to determine the relative three-dimensional positions of various points on the earth’s surface. This is done by computing the vertical and horizontal distances, angles between the points, collecting the observations, and plotting them on a map of any appropriate scale. Accuracy can be achieved by using the latest instruments like a theodolite, tachometer, etc. Leveling is a subdivision of surveying where the objective is to locate the elevation of objects considering a datum level.

Question

A man standing on the ground can see just the tip of a tower 25km away. If the eye of the man is 1.8m above sea level, determine the height of the tower above sea level considering curvature and refraction correction.

The top of the tower signal at B 2000 m away from A was sighted through a transit with a recorded vertical angle of 3’30”. The height of the mast is 12 m and H.I.ofthe transit above the point where it is set is 1.10m. The elevation of the point under the transit A is 133.33 m. Compute the elevation of the base of the signal B.

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