Polarimetric Approaches for Persistent Scatterers Interferometry
IEEE Transactions on Geoscience and Remote Sensing
In previous works, a general framework to exploit polarimetric diversity to optimize the results of Persistent Scatterers Interferometry (PSI) was presented, but tested only with dual-pol data. In this paper, the performance of these algorithms is assessed using fully polarimetric data, acquired by Radarsat-2 satellite over the urban area of Barcelona (Spain). In addition, two new highly efficient polarimetric optimization methods, named MIPO and JDPO, are introduced and evaluated. Given the
... uated. Given the variety of dual-pol configurations provided by current polarimetric satellites, such as TerraSAR-X and Radarsat-2, and the upcoming launch of Sentinel-1, ALOS-2 and Radarsat Constellation Mission, a study has been also carried out in order to determine the best performing dual-pol configurations for polarimetric PSI. Subsidence maps of the area of study are computed for single-pol, dual-pol and full-pol data, which show the increase of density of pixels with valid deformation results as more polarimetric information is made available. In particular, for full-pol data we get an increase of up to 2.5 times more pixels for coherence-based PSI techniques (degraded-resolution), and over 4 times more for amplitude-based approaches (fullresolution), in comparison with single-pol data. Both higher density and quality of pixels yield better results in terms of coverage and accuracy.