Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2754

Full Length Research Paper

Evaluation of recent global geopotential models based on GPS/levelling data over Afyonkarahisar (Turkey)

Ibrahim Yılmaz1*, Mustafa Yılmaz2, Mevlüt Güllü1 and Bayram Turgut1
1Department of Geodesy and Photogrammetry, Faculty of Engineering, Kocatepe University of Afyonkarahisar, Ahmet Necdet Sezer Campus Gazlıgöl Yolu 03200, Afyonkarahisar, Turkey. 2Directorship of Afyonkarahisar, Osmangazi Electricity Distribution Inc., Yuzbası Agah Cd. No: 24, 03200, Afyonkarahisar, Turkey.
Email: [email protected]

  •  Accepted: 20 January 2010
  •  Published: 31 March 2010


This study presents the evaluation of the global geo-potential models EGM96, EIGEN-5C, EGM2008(360) and EGM2008 by comparing model based on geoid heights to the GPS/levelling based on geoid heights over Afyonkarahisar study area in order to find the geopotential model that best fits the study area to be used in a further geoid determination at regional and national scales. The study area consists of 313 control points that belong to the Turkish National Triangulation Network, covering a rough area. The geoid height residuals are investigated by standard deviation value after fitting tilt at discrete points, and height-dependent evaluations have been performed. The evaluation results revealed that EGM2008 fits best to the GPS/levelling based on geoid heights than the other models with significant improvements in the study area.


Key words: Geopotential model, GPS/levelling, geoid height, EGM96, EIGEN-5C, EGM2008(360), EGM2008.