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This paper is focused on the verification of two quasi-geoid models for the territory of Bulgaria (the model integrated into the Geodesy, Cartography and Cadastre Agency (GCCA) official product for the transformation of geodetic data and a model derived using the GNSS/levelling method) through direct geodetic measurements. The study was developed in the framework of the current 5th cycle of the 1st Order National Levelling Network (NLN), conducted in accordance with the requirements of the new 2021 Instruction [1]...

In geodetic practice, the definition of spatial objects in relation to a uniform and reliable coordinate system is of paramount importance. In the Republic of Bulgaria by the Decree of the Council of Ministers No 153 of 29 July 2010 and Regulation No 2 of 30 July 2010 on the Definition and Maintenance of the Bulgarian Geodetic System 2005 (BGS2005). The points of the State GPS network (SGPSN), defined in the ETRS89 coordinate system, realization ETRF2000, epoch 2005.0 represent a realization of BGS2005 and their i...

The Republic of Bulgaria is located on the periphery of the Eurasian tectonic plate, and part of it falls within the seismically active Aegean extensional region [1]. The study of modern crustal movements is important in terms of elucidating the geodynamic behaviour of the country on a regional and global scale. It should be taken into account when establishing and maintaining geodetic networks for high precision applications. It should be noted that for the main carrier of the Bulgarian geodetic system - the Stat...

With this publication is intended to demonstrate the possibility of practical realization of European Terrestrial Reference System 89 (ETRS89) for the territory of the Republic of Bulgaria, by developing an intraplate velocity field model using velocities of a network of continuously operating GNSS stations. The introduction of the ETRS89 is aiming to unify national reference systems for geodetic measurements, cartography, GIS, research and navigation in Europe. The EUREF Permanent GNSS Network (EPN), which consis...