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European vertical reference system in Baltic countries
2014
Celms, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Bimane, I., Latvia Univ. of Agriculture, Jelgava (Latvia) | Reke, I., Latvia Univ. of Agriculture, Jelgava (Latvia)
At the moment all three Baltic countries – Estonia, Latvia and Lithuania – use Baltic Normal Height System 1977 as a national height system. But the European Union regulations declared the European Vertical Reference System as a national height system. For height transformation there is a transformation formula for each European country. After calculations it is seen that height difference between Baltic Normal Height System 1977 and the European Vertical Reference System depends on point location in the territory (coordinates). This unequal height difference between both height systems will cause unequal height values on border connection points between the Baltic countries.
Afficher plus [+] Moins [-]Research of national geodetic network elevations at Eastern part of Latvia
2014
Celms, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Ratkevics, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Rusins, J., Latvia Univ. of Agriculture, Jelgava (Latvia)
Along with the development of the technological possibilities, the Global Positioning Satellite System (GNSS) is increasingly used in geodetic measurements. Using GNSS, measurements are performed in horizontal plane as well as for point elevation determination. The aim of the article is to demonstrate that the GNSS measurements’ static mode has a high accuracy. To achieve the aim the following objectives were set: 1) to perform global positioning measurements in Class I national leveling network, 2) to calculate the elevation above the sea level, 3) to evaluate the accuracy of performed GNSS measurements. The following research methods were used: static measurement method and analytical method for comparison of the obtained data.
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