LEVELLING VS. InSAR IN URBAN UNDERGROUND CONSTRUCTION MONITORING. CASE OF LA SAGRERA RAILWAY STATION (BARCELONA, SPAIN).

Enric Vázquez-Suñé1, Alejandro Serrano-Juan1,2, Estanislao Pujades3 and Michelle Crosetto4, (1)IDAEA-CSIC, Barcelona, Spain, (2)Associated Unit: Hydrogeology Group (UPC-CSIC), Barcelona, Spain, (3)Université de Liège, Liege, Belgium, (4)(5) Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Division of Geomatics, Av. Gauss 11, E-08860 Castelldefels, Barcelona, Spain, Barcelona, Spain