期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2016
卷号：XL-3/W4
出版社：Copernicus Publications
摘要：This paper is focused on Persistent Scatterer Interferometry (PSI), the most advanced class of differential interferometric Synthetic Aperture Radar techniques (DInSAR). The paper only refers to the PSI techniques that exploit data acquired by spaceborne SAR sensors. PSI is a powerful remote sensing technique used to measure and monitor the temporal evolution of surface deformation phenomena. In this work we consider the C-band applications based on the ERS and Envisat SAR data. It starts with a concise description of the main characteristics of PSI deformation monitoring, and an outline of the main PSI products. An important part of the paper includes the discussion of the major advantages and the key open technical issues of the technique. The open technical issues include the limitations of PSI to spatially and temporally sample the deformation phenomena, the critical limitation related to the deformation rates that can be observed, etc. The last part of the paper discusses some relevant PSI validation results, which represent a key aspect that drives the applicability and acceptability of this relatively new technique. In the last fifteen years the DInSAR techniques have demonstrated their potential as land deformation measurement tools, while in the last few years their capability has been considerably improved by using the PSI techniques. The paper describes the main outcomes of a major PSI validation project funded by the European Space Agency, which was run within the GMES Terrafirma project. The key findings of this validation exercise are summarized in this paper. The project generated rich PSI data sets and interesting global statistics, which concern large sets of measurements and provide information on the global behaviour of the key PSI products: mean deformation velocities, deformation time series, density of the PSI measurement, topographic corrections and geocoding of each measured point, etc
