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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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Abstract
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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