Akademik Veri Yönetim Sistemi
International Astronomical Union (IAU) Symposium 401, Advancing Reference Systems, Ephemeris and Standards, La Plata, Arjantin, 4 - 09 Ağustos 2025, ss.1-13, (Tam Metin Bildiri)
The geoid is a closed surface representing the Earth's true shape, coinciding with mean sea level. It is used in geodesy to determine the orthometric heights of points. In this study, the effect of different density models on the gravimetric geoid was investigated using the UNB Global Topographical Density Models at 1 arc-degree grid spacing and 30 arc-seconds grid spacing, as well as a constant density value of 2670 kg/m³. The computation of the geoid was based on the ITU_GGC16 global geopotential model. The SRTM model with 1 arc-second resolution was used as the digital elevation model. Other terrestrial data were obtained from the Colorado region in the western United States. The geoid model was determined using the Least Squares Modification of Stokes' Formula based on the KTH (Royal Institute of Technology) method. Various gravimetric geoid models were produced using different density models and other data, and these models were compared both among themselves and with the GNSS/Levelling geoid. A five-parameter corrective surface was applied to eliminate systematic errors during model comparison.