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World Journal of Engineering Research and Technology

( An ISO 9001:2015 Certified International Journal )

An International Peer Reviewed Journal for Engineering Research and Technology

An Official Publication of Society for Advance Healthcare Research (Reg. No. : 01/01/01/31674/16)

ISSN 2454-695X

Impact Factor : 7.029

ICV : 79.45

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Abstract

PRACTICAL EVALUATION OF ATMOSPHERIC REFRACTION EFFECT ON SURVEYING OBSERVATIONS

Ismat M. Elhassan*

ABSTRACT

The irregular atmospheric refraction is an important source of systematic errors in various surveying observations. One important effect is that on observed vertical angles that are needed for many surveying applications such as trigonometric levelling. In this article the effect of atmospheric refraction on vertical angle observations is studied and results are outlined. It is observed that the highest effect of atmospheric refraction on vertical angle observation occurs during the day, when the sun is vertically above the observer. Irregular effect happens when the sun suddenly rises after being hidden by clouds.

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