Análise da viabilidade do uso das técnicas DInSAR e PSInSAR com dados TerraSAR X para monitorar movimentos da superfície na região da UHE Salto Pilão-SC

Differential Interferometry (DInSAR) and Persistent Scatterer Interferometry (PSInSAR) techniques are being used to monitor natural or anthropogenic surface displacements related to tectocnic faults, vulcanoes, glaciers, water reservoirs, mining activities and man-made structures, like tunnels. However, DinSAR has some limitations due to temporal decorrelation, mainly in forested or even rural areas, geometric decorrelation, due to large baselines, and atmospheric effects. Also, PSInSAR has restrictions in some vegetated areas due to low density of Persistent Scatterers points. In this context, the main objective of this work was to study the feasibility of using DinSAR and PSinSAR with a data stack of ten ascending TerraSAR X StripMap images to monitor surface motion in the Salto Pilão Hydroeletric Plant area, in Santa Catarina state. In order to achieve this purpose, coherence data was generated for the first 11-day interval and 33-day interval, as well as the maximum available interval, to evaluate DinSAR. To evaluate PSinSAR, Persistent Scatterers were detected with the entire TerraSAR X data set and them density was estimated. The analysis of coherence, as a base for performing a Differential Interferometric (DInSAR) approach, yielded insufficient results. Strong vegetation in the area causes temporal decorrelation and thus a strong loss of coherence. Thus, the application of DInSAR could not be feasible. The point density in the area of interest was estimated to 85 points per km². This density would be sufficient for a PSInSAR analysis to give reasonable results. As such, PSI analysis along the tunnel axis can therefore be feasible.Pages: 8199-820