GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 1.3 GNGTS 2024 felds calculated by INGV and OGS, with diferent analysis sofwares, Bernese and Gamit Globk Fig. 1 – Map of the study area of the PRIN 2020 NASA4SHA Project. Fig. 2 – Map of the horizontal GNSS velocites in the Eurasian-fxed reference frame, from the combined soluton. Error ellipses at 95%. The inverted green triangles are the locatons of the resurveyed vertces of the IGM95 network. respectvely. The velocity feld is expressed in the ITRF2014 reference frame, with respect to the Eurasian plate (Altamimi et al., 2017). The combinaton procedure described in Devot et al., 2017, is based on a linear least-squares approach, where we consider each velocity feld as a sample of the true velocity feld and the combined velocity as the best estmate of the true velocity feld. The combined soluton allows a validaton of the velocity feld by assessing the velocity repeatability of velocites at the common sites and minimize the probability of including biased velocites.