The paper presents analysis of determination of vertical movement of the surveying boat called "heave" with the use of Robotized Total Station (RTS) technique. The experimental, hydrographic surveys on Vistula river were conducted where the water level was changing significantly over time depending on the operational schedule of the power plant. Verified hydrographic data had to be brought to the common water level. To determine the final water level, data on the height of the Robotized Total Station prism positioned on the boat during sounding was considered. The RTS technique with 0.02-0.05 m vertical accuracy proved to be very useful and essential in engineering inland bathymetric measurements.

DOI: https://doi.org/10.3846/enviro.2017.229