The reliability of surface fitting methods in orthometric height determination from GPS observations
Uzun, Sibel and Leyla Cakir
Nowadays, satellite based Global Positioning Systems (GPS) which attain gradually widespread usage field, provides important contributions in a surveying or engineering applications. Three-dimensional coordinates of points are obtained accurately and quickly with GPS observations, in the geosentric World Geodetic System 1984 (WGS84). However, height measured with GPS is ellipsoidal height. Ellipsoidal heights which are defined in geometrical sense, donnt have any physical meaning, must be transformed to orthometric heights because of having been used in practical surveying. For this, it is necessary that geoid undulation is known. In this study, It is used interpolation with polynomial methods in deriving orthometric height from GPS/levelling in a study area. The reliability of the data is also investigated in terms of conventional outlier test and robust statistics and It is aimed that the most appropriate surface models are determined for chosen study area.
Event: XXIII International FIG Congress : Shaping the change
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