Using different interpolation methods in determining orthometric heights from ellipsoidal heights and selecting the appropriate height model

Heights determined by GNSS are ellipsoidal heights. However, orthometric heights are used in surveying and engineering applications. Therefore, ellipsoidal heights need to transformed to orthometric heights. Many interpolations methods are used in the application of GNSS-Leveling technique. In this thesis, we used polinomal regression and kriging interpolation methods and their subvariations. The differences between the geoid heights obtained by GNSS-Leveling and the computed TG-03 geoid heights were calculated. With these differences, surface models were created and the appropriate surface model was tried to be determined.