ABSTRACT
The interferometric technique able to assess ground displacements is the Differential InSAR (DInSAR) that analyses the differences in phase values between two Synthetic Aperture Radar (SAR) images of the same area gathered at different times. Compared to the conventional methods for monitoring a landslide, DInSAR allows obtaining information about surface deformation over wide unstable areas in relatively short times and at lower costs. This chapter aims to develop some preliminary considerations, deriving from the use of the Permanent Scatterers (PS) technique in a small town of Campania region, Italy, where some slow-moving complex landslides affect the urban area. The SAR data have been relieved from the ERS-1 and ERS-2 sensors of the European Space Agency in the 1992-2001 time spans. The PS technique focuses on the use of long temporal series of SAR data, extracted from the European Space Agency archive gathering satellite acquisitions since 1991, and on phase stable targets, the so-called permanent scatterers.
