8 reference points were stabilized on the sea of Slovenian coast, with the intention of launching a geoid model. These points had to have their altitudes assigned in the SVS2000_Trst and SVS_2010_Koper hight system. In this thesis, a reference point, stabilized in Strunjan, will be connected to the geometric leveling network. With the help of static GNSS levelling we assigned this reference point an ellipsoid altitude. Based on the measured ellipsoid altitude and the altitude of the reference point, we will determine the altitude of geoid, which will then be used to analyze the quality of the geoid altitude from the geoid model SLOAMG_2000 and SLOAMG_2016.