Contribution of the global geopotential models on gravimetric geoid determination: a case study of Colorado, USA

YILMAZ N., ÇAKIR L.

Survey Review, 2025 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1080/00396265.2025.2452795
  • Dergi Adı: Survey Review
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Environment Index, Geobase, INSPEC
  • Anahtar Kelimeler: GGM, GNSS-levelling data, Gravimetric geoid determination, KTH method, Mountainous region
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

A gravimetric geoid model was computed by using the Least Squares Modification of Stokes' formula, called the KTH (Royal Institute of Technology) method. This paper examines the impact of global geopotential models (GGMs) on the gravimetric geoid that we determined over a mountainous region in the Colorado test area. The accuracy of the global geopotential models affects the accuracy of the gravimetric geoids that are created using these models. In this study, the most recent and high-resolution GGMs were chosen, and the gravimetric geoid models produced with the GGMs were compared with the GNSS-levelling geoid. To eliminate systematic errors between geoid models derived from local and global data, a 7-parameter corrector surface was employed during this comparison. Additionally, the (simple) Bouguer gravity anomalies from GGMs and terrestrial data were compared. Thus, the GGM that best fits the local data was determined in the gravity anomaly calculation.