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The New National Realization of the EVRS Height System in Slovakia
Jančovičová, Miroslava ; Droščák, Branislav ; Bublavý, Ján
Since 1957, in Slovakia the Baltic height system after adjustment with the reference tide gauge Kronstadt has been valid. The measurements in the National leveling network (Štátna nivelačná siteť – ŠNS) are still incorporated into this height system. In 2009 the EVRS height system, realization EVRF2000 was implemented to the decree of the Office of Geodesy, Cartography and Cadaster of the Slovak Republic (ÚGKK SR). However, the adjustment of the ŠNS in the EVRF2000 has not been performed. In 2019, the ÚGKK SR expressed interest in transitioning from the Bpv to the EVRS and its latest realization EVRF2019 as a primary height system by using the latest available measurements and the modern approach to calculating the normal heights through geopotential numbers. In the same year, a new, more accurate quasi-geoid model named GMSQ2019 was procured. The Geodetic and Cartographic Institute Bratislava (GKÚ) therefore realized the adjustment of the geopotential numbers of the 1st order points of the ŠNS in the realization EVRF2019. Currently, the GKÚ works on the connection of the leveling lines of the 2nd order of the ŠNS. The new national realization was named SKVRF2023. The testing at the points of the National spatial network (Štátna priestorová sieť – ŠPS) showed that the normal heights in the EVRS realization EVRF2019 in combination with the new quasi-geoid model GMSQ2019 will enable to determine the heights using GNSS methods on the territory of Slovakia with a high accuracy of 1 to 2 cm. An advantage of the transition to the EVRS and its realization EVRF2019 will be the direct connection of the ŠNS to the EVRS (and also to the International Height Reference System) and a simple transformation between its next realizations.
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News From Surveying Points Information Provision and Reference Transformation Service in Slovakia
Droščák, Branislav ; Bublavý, Ján
Information about Geodetic control surveying points information in Slovakia has been provided free of charge for a long time via the ZBGIS map client and precise Geodetic control - reference geodetic points layer. In recent years, the layer has been updated and improved several times in order to provide customers with better and clearer information. For example, the new distinction of points according to orders or classes was introduced. Another important service of the Geodetic control in Slovakia is the Transformation service, which is a reference service for the correct execution of the transformation between all binding geodetic reference systems valid in Slovakia. In addition, the Transformation service also enables reference transformations into selected geodetic systems valid in our territory in the past, so it provides a unique transformation tool that has no parallel.
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