Abstract:

GPS points which were measured height by levelling (GPS/levelling points) are used to determine geoid undulation, from which interpolate geoid undulation of another points to determine height by GPS. When using the global geoid model to determine geoid undulation, data measured at GPS/levelling points is used to assess the suitability of the geoid model with real surface geoid of measurement area, not only that, this data can also be used to accurately geoid model in the area of GPS/levelling points. This paper presents a method to build local Geoid models based on correction for the global Geoid model from relative model of measuremets in GPS/levelling points