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INFLUENCE OF THE REFRACTION ON TRIGONOMETRIC LEVELLING BETWEEN CLOSE POINTS

Prof. Dr. Djuro Barkovic, Sergej Baricevic, Mag. Eng. Geod. et Geoinf., Assoc. Prof. Dr. Mladen Zrinjski

First published: 2017-06-20https://doi.org/10.5593/sgem2017/22/s09.045View metrics

Abstract

When determining height differences by using trigonometric levelling method, some affecting values are present. Besides measuring imperfection due to instrumental imperfection and surveyorпїЅs errors, quality of the trigonometric levelling results also depends on following external affecting values: height difference between observed points, distance between observed points and temperature gradient (change of temperature with height) between observed points. Therefore, if the height difference is bigger, the influence of vertical refraction on the sightline is bigger. Also, temperature gradient in layers of air directly affects the sightline, that is, on the measuring of vertical angles. When distance between observed points is longer, the effect of EarthпїЅs curvature is bigger, so, to eliminate this effect, trigonometric levelling was conducted between relatively close points, approximately 200-meter distant. Besides that, levelling was conducted by means of two different methods to obtain partially independent height differences between close points. In that way, it was possible to calculate the refraction influence from difference of the results obtained by two methods.

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Publication details

Title
INFLUENCE OF THE REFRACTION ON TRIGONOMETRIC LEVELLING BETWEEN CLOSE POINTS
Authors
Prof. Dr. Djuro Barkovic, Sergej Baricevic, Mag. Eng. Geod. et Geoinf., Assoc. Prof. Dr. Mladen Zrinjski
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 17th International Multidisciplinary Scientific GeoConference SGEM2017, Informatics, Geoinformatics and Remote Sensing
Publisher
STEF92 Technology
Year
2017
Pages
361-368
SWS Citekey
Barkovic20179361368
ISSN
1314-2704
ISBN
978-619-7408-02-7
Language
en
Publication type
Conference Paper
Keywords
trigonometric levellingrefractiontemperature gradientclose points
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