Assessment of the Contribution of Polarimetric Persistent Scatterer Interferometry on Sentinel-1 Data

Time series of Sentinel-1 data are widely used for monitoring displacements the Earth surface using persistent scatterer interferometry. By default over land, images include two polarimetric channels: VV and VH. However, most works in this application exploit only channel, whereas VH channel is discarded its lower amplitude. Thanks to development interferometry methods, one can integrate multi-polarisation channels into a single optimal one. Previous studies proved that number spatial density measurement points increased. In work, we explore reason why increases when amplitude dispersion ( $D_{A}$ ) as selection criterion. Results obtained three geographical locations show helps ways. first place, mean increased targets which have higher usually associated with rotated elements scene. second more importantly, decreased many areas exhibits fluctuations peaks. insensitivity these scene changes, it provides additional reliable despite their low The increment not extends enables detection active deformation found results, but also accurate results than thanks points, estimation.