Examples of Applications of Common Baltic Sea Datums in Analyzes of Extreme Sea Level Change

This work demonstrates the examples of application of common reference datum NAP, within the EVRS for the Baltic Sea. They are mainly visualizations of parameters of extreme sea levels: distribution of maximal and minimal sea levels, amount of storm surges, distribution of theoretical water, short term deformation of sea surface, differences between sea level observation data and model data. Material research included hourly sea level observation data from 49 gauges stations located along the Baltic Sea coasts from the period 1960-2010. Hourly sea level data were corrected to the single vertical datum which is NAP in the practical realization of the EVRS system called EVRF 2000 (The European Vertical Reference Frame 2000). Basic calculations were done using the Coordinate Reference Systems in Europe (CRS EU) portal with simultaneous consultations of the relevant institutes of Baltic countries.