At the transformation of the GNSS measured coordinates to the local coordinate system it’s necessary
to convert heights from the ellipsoid system to heights above sea level (altitude), for what we need well
defined geoid model. In this thesis I checked what is the derogation of national geoid model
(SLOG2000) from the actual values on the area of Radovljica by interpolation of the local geoid
undulation plane which represents actual values. Plane was interpolated over the points on which we
conducted static GNSS survey for ellipsoid heights and leveling measurements for the above sea heights.
Result analyze showed that average national geoid model derogation on the selected area is 10