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We have investigated the ongoing deformation at the Campi Flegrei caldera (Italy), from 2002 to the end of 2006, by analyzing ENVISAT ASAR IS-2 data. The study has been performed by exploiting the SBAS-DInSAR algorithm that allows us to investigate the temporal evolution of deformation at both low and full spatial resolution scales. The low resolution analysis highlighted the renewed volcanic activity that started on mid-2005; moreover, the obtained results have been confirmed by the leveling data collected by the Osservatorio Vesuviano. The full resolution analysis allowed us to identify isolated subsiding structures, whose deforming behaviors were not detected at the low resolution spatial scale.