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eISSN 2029-7092 online
eISBN 978-609-457-640-9
ISBN 978-609-457-690-4 CD
Technologies of Geodesy and Cadastre

Romuald Obuchovski, Petras Petroškevičius, Darius Popovas

Analysis of vertical deflection periodic variations

Conference Information: 9th International Conference “Environmental Engineering”, 22–23 May 2014, Vilnius, LITHUANIA
Source: ICEE-2014 - International Conference on Environmental Engineering
Book Series: International Conference on Environmental Engineering (ICEE) Selected papers
ISSN: eISSN 2029-7092 online
ISBN: eISBN 978-609-457-640-9
ISBN: ISBN 978-609-457-690-4 CD
Year: 2014
Publisher: Vilnius Gediminas Technical University Press Technika

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Most of the geodetic measurements are related with the direction of gravity or vertical. Angular, height difference measurements are performed in horizontal coordinate system. Geodetic measurement data are reduced to a uniform coordinate system prior to processing, taking into account gravity field nonhomogenity. However, increasing accuracy of geodetic measurements requires to assess deviations of the vertical caused by the celestial body effect. The aim of this study is to analyze periodic changes to the direction of the vertical, due to effect of the celestial body, and to assess the impact of the closest celestial bodies which have greater impact. Celestial body effect in the vertical deflection components in meridian and prime vertical was examined. Zonal and nonzonal wave’s effect and their amplitude was investigated and evaluated. Results of this work can be used in precise angular measurements and height difference determination, and in the determination of the deflection of the vertical using geodetic astronomy techniques to clarify the shape of the geoid. Results also can be used to assess effect of zonal waves of deflection of the vertical.

Keywords: Deflection of the vertical; tide generating potential; tidal waves.

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