Um modelo gravimétrico do geóide das regiões Ibérica e Macaronésica - ICAGM07

Abstract

The Iberia-Canary-Azores gravity and geoid model (ICAGM) is a project within the Iberian countries aimed at the determination of a high precision geoid model. This geoid intends to be a geographic extension of EGG97 to the west limit of European plate tectonics (Azores archipelago) and to the south of Canary islands. The main purpose of this geoid surface is to establish the connection between the existing vertical reference systems in lberia and Azores and Canary islands and also to be the reference surfacefor real time kinematics positioning within this geographic area. The geoid model was compared with GPS-leveling data on Iberia (Portugal and Spain). and on 7 different vertical data used on Azores, Madeira and Canary archipelagos. The comparisons indicates an overall precision of 10 cmfor Portugal and 12 cmfor Spain and offsets rangingfrom 100 cm in Canary to 36cm in S. Miguel island on Azores, with an offset of 16 cm between Portugal and Spain mainland. The later offset is close to the 18 cm obtained from the EUVN, revealing a very good precision of this geoid model for the vertical data unification.