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Evangelia Lambrou

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Evangelia Lambrou
Laboratory of General Geodesy, School of Rural and Surveying Engineering, National Technical University of Athens, 15780, Greece

Lambrou, Evangelia. "PRECISE LOCAL GEOID DEFINITION CASE STUDY: NISYROS ISLAND IN GREECE." IJETSI, vol. 3, no. 2, Mar.-Apr. 2018, pp. 107-121, Accessed 2018.
Lambrou, E. (2018, March/April). PRECISE LOCAL GEOID DEFINITION CASE STUDY: NISYROS ISLAND IN GREECE. IJETSI, 3(2), 107-121. Retrieved from
Lambrou, Evangelia. "PRECISE LOCAL GEOID DEFINITION CASE STUDY: NISYROS ISLAND IN GREECE." IJETSI 3, no. 2 (March/April 2018), 107-121. Accessed , 2018.

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The global geoid model EGM08 consists nowadays one of the best tools for quick transformation of geometric heights which provided by GNSS measurements to orthometric ones. Nevertheless there are some areas worldwide, where the adaptation of EGM08 is not satisfactory due to large terrain fluctuations (high mountains, spread islands etc.) or due to strong gravity anomalies. Moreover, the unification of vertical datums between the islands and mainland in Greece as well as between adjacent countries remains a main goal which is mainly supported by satellite gravity missions, e.g., the CHAMP, GRACE and GOCE satellites in order to produce accurate and reliable GGMs. Thus, the determination of accurate (under cm) orthometric heights via the geometric ones is required by the demanding infrastructure and monitoring projects. It is well known that geometric heights are easily obtained by GNSS measurements, while the orthometric ones are extremely demanding in time and staff in order to be determined by some mm accuracy. This study applies a simultaneous measurement project of orthometric and geometric height differences in order to assess in terms of time and cost, the calculation of a precise (under cm) local geoid on Nisyros island- Greece. Nisyros Island is located at the southeast edge of the Aegean Sea. A 13 benchmarks (BMs) network was properly spread on the island. GNSS measurements were carried out by the relative static positioning method. The orthometric height differences between BMs were measured by the method of Accurate Trigonometric Heighting. The orthometric and geometric height of each benchmark (BM) was determined with +_6mm and +_10mm respectively by applying least square adjustments. The best adaptation equation is determined for the local geoid undulation. Additionally the corresponding values of the geoid undulation N were calculated by the EGM08 as well as a reduction equation. Moreover the zero-level geopotential value (Wo) of the island, has been determined and be compared to the corresponding ones of the neighboring to Nisyros Hellenic islands and the Greek Vertical Datum (GVD).