Abstract
AbstractThe main goal of this study was to test several methods to determine a local geoid model in the greatest metropolitan area in Tunisia, the region of “Grand Tunis.” To this end, 56 leveled GPS points were used as well as the global geoid models EGM96 and EGM2008. The geoid was compiled by calculating a correction applied to the two global geoid models by least squares and kriging methods. The computation of the local model of geoid has been carried out on a regular 0.05′ by 0.05′ grid in a 40 km by 40 km quadratic study area. It finally turned out that the use of the EGM2008 global geoid model combined with a correction using the kriging method is the best combination. The RMS fit obtained is around 12 cm. Similar studies were performed in other countries (Gwaleba in J Geomat 12(2), 2018; Oluyori et al. in Int J Sci Res Publ 8(10), 2018).KeywordsGeoidLevelingGPSEGM2008EGM96Least squaresKriging
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