ABSTRACT
Persistent Scatterer Interferometry (PSI) is a powerful remote sensing method for measuring and monitoring surface displacements on the Earth’s surface. With the launches of Sentinel-1A and 1B, C-band SAR data with a spatial resolution of 5×20 meters became freely available. This study investigates the applicability of freely available Sentinel-1 radar data for supporting assessment of infrastructure assets within the ASFINAG road network. While the absence of consistently reflecting objects remains a limiting factor in open areas, measuring points are well detected at prominent features and corresponding deformation rates can be derived. At the same time, certain challenges related to selection of reference points, phase unwrapping, topographic phase correction and atmospheric correction still need to be overcome. The application with freely available Sentinel-1 data is tested for the first time on a prestressed concrete bridge in the alpine region.
