Employing precise GNSS measurements (accuracy of 1–3 cm), in conjunction with height information from Greece’s National Triangulation Network (5–10 cm accuracy) and an appropriate, recent geoid model (5–6 cm accuracy), we estimate through the so-called GNSS-levelling, the height of Olympus to 2917.727 m with respect to Greece’s officially accepted mean sea level and 2918.390 m with respect to the global vertical datum. In September and October of 2022, we conducted a GNSS campaign, focusing on the area of highest Olympus peaks. There is a variety of released heights, which range from 2917 to 2919 meters. Since then, only unofficial measurement campaigns have taken place. The last official Olympus height determination goes back 102 years by the Swiss surveyor M. ![]() The present study deals with the determination of Mount Olympus summit (Mytikas), exploiting modern observations such as Global Navigation Satellite Systems (GNSS) and existing geodetic information.
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