Two hills 90km apart has elevation of 60m and 200m. What would be the minimum height of the tower that could be constructed in any of the hills so that it would be inter-visible from each other considering the effect of curvature and refraction?

Two hills 90km apart has elevation of 60m and 200m. What would be the minimum height of the tower that could be constructed in any of the hills so that it would be inter-visible from each other considering the effect of curvature and refraction?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Photogrammetry

Photogrammetry is a technology of taking measurements of physical objects present in the environment, using photographs. It includes the process of recording and analyzing a three-dimension image in the two-dimension form. Photogrammetry was invented around 150 years ago in 1851 by Aimé Laussedat, he was also known as the father of photogrammetry, but this method was not in use until 50 years after its invention. This method was first used in Germany by Dr. Albrecht Meydenbauer in 1893 who was the director of the Royal Prussian Photogrammetric institute founded by him.

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The tip of a tower of 210m height is just visible above the horizon from an observer with an eye height of 1.35m. What is the distance between the tower and the observer considering curvature and refraction?