Abstract
Although discussed worldwide, the application of tidal systems in the Bulgarian National Vertical Reference System is still in its initial steps. The information available in the papers and technical reports concerning the current tidal system and/or tidal reductions applied to different quantities is either vague or missing.
The current paper shows the status of terrestrial gravity and levelling data in Bulgaria with respect to the tidal system. The differences between geopotential numbers and normal heights in mean and zero tidal system are examined. For data source, four levelling lines from the National First Order Levelling Network are used. In addition, a comparison between the calculated normal heights and the official data published in the “Catalogue of the National First Order Levelling Network Benchmarks in European Vertical Reference System 2007” is made. At the end of the paper, proposals for the proper choice of tidal system in the country are given, taking into account future international as well as local precise geodetic applications.
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Notes
- 1.
The second one (Darakchiev 2001) deals with tidal reductions to astronomic latitude. The third article (Stoyanov and Ivanov 2000) is examining the importance of a Geodetic Reference System (GRS) and a global geopotential model having the same permanent tidal system. It is a proposal for an improved GRS and as such the paper is focusing on conceptual rather than a specific implementation of the tidal system in Bulgarian geodetic practice.
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Acknowledgements
The authors would like to thank local geodetic archive “Geokartfond” at Agency of Geodesy, Cartography and Cadastre for the provided data and financial support for presenting this paper at the International Symposium on Gravity, Geoid and Height Systems 2012 in Venice.
The authors are also very grateful to Dr. Martina Sacher and the other two anonymous reviewers for their valuable comments, suggestions and recommendations taken into account in the final edition of this paper.
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Valcheva, S., Yovev, I., Grebenitcharsky, R. (2014). Tidal Systems and Reductions for Improvement of the Bulgarian National Vertical Reference System. In: Marti, U. (eds) Gravity, Geoid and Height Systems. International Association of Geodesy Symposia, vol 141. Springer, Cham. https://doi.org/10.1007/978-3-319-10837-7_33
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DOI: https://doi.org/10.1007/978-3-319-10837-7_33
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