Evaluation of recent global geopotential models by GNSS/ Levelling data for geoid determination

Global geopotential models comprised of spherical harmonic coefficients ( C nm, S nm ) are used to determine the outer gravitational field of the earth. Aforementioned coefficients are obtained from satellite orbit perturbations, terrestrial gravity anomalies and altimetry data.The expected value of the standard deviation for these factors, model external gravitational field of the earth is not represented in the best possible way. A new impetus with the purpose of determining gravity field satellite mission winning global geopotential model studies to determine the accuracy of the test is passed.Model accuracy of the geoid height is calculated directly from the model, gravity anomalies, gravity and vertical deflection components of the disorder determined by comparison using spatial dimensions.Comparison between models from the West Central Anatolia Region 100 TUTGA GPS / Leveling data is made with.Comparison between models is carried out by using error degree variances and GPS/Leveling data in Turkey.