Impact of the UNB topographical density model on precise geoid determination in the high mountainous region
Survey Review, cilt.57, sa.400, ss.65-72, 2025 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 57 Sayı: 400
- Basım Tarihi: 2025
- Doi Numarası: 10.1080/00396265.2024.2379653
- Dergi Adı: Survey Review
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Environment Index, Geobase, INSPEC
- Sayfa Sayıları: ss.65-72
- Anahtar Kelimeler: Global crust model, Gravimetric geoid determination, LSMS method, Terrestrial gravity data, UNB
- Karadeniz Teknik Üniversitesi Adresli: Evet
Özet
A precise gravimetric geoid model is computed utilising Stokes’s formula, supposing an absence of topography above the geoid. Subsequently, the geoid model undergoes a simple correction for topographic masses, the constant density is taken as 2670 kg/m3. Notably, the true density of topographical mass deviates by approximately ±20% from this constant value. Recently, the University of New Brunswick in Canada released a global topographical density model at a 30 arc-second resolution. This paper investigates the impact of incorporating this model on the precision of the gravimetric geoid within a mountainous region in the Colorado test region. Numerical findings reveal that variations in geoid undulation attributable to this model can extend to a few decimetres, a discrepancy that cannot be neglected in geoid modelling with one-centimetre precision. It is therefore recommended that the considerable impact of topographic density fluctuations on geoid determination be taken into account, particularly in mountainous regions.