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Original scientific article

DETERMINATION OF AIR REFRACTION INFLUENCE ON TRIGONOMETRIC HEIGHT DIFFERENCES

By
Milan Trifković ,
Milan Trifković
Contact Milan Trifković

Faculty of Civil Engineering, Subotica, University of Novi Sad, Novi Sad, Serbia

Žarko Nestorović
Žarko Nestorović

PC EPS, Branch Djerdap 1, Kladovo, Serbia

Abstract

Efficiency of trigonometric levelling method for height differences determination is better than those determined by geometric levelling but its accuracy is significantly lower. Development of accuracy of geodetic instruments increases possibilities for improvement accuracy of trigonometric levelling.However, air refraction appears as ultimate limitation factor for accuracy of trigonometric heights determination improvement. This paper aims to research the influence of air refraction on accuracy of height differences determined by trigonometric levelling method. Basic statistical hypothesis is that influence of air refraction on height differences is negligible. The case study is based on the results of regular measurements on “Vlasina” dam by using results of geometric and trigonometric levelling.

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