Geodaysit 2023

MTInSAR and ground-based geomatic observations for the analysis of displacements affecting an urbanized area
06-12, 15:15–15:30 (Europe/London), Sala Videoconferenza @ PoliBa

Hydro geological instabilities involving urban areas represents a potential threat for structures and people. An in-depth knowledge of the spatial and temporal evolution of the ground surface and the related displacement field becomes then essential for mitigating and managing the risk associated with these phenomena. In this context, Multi-Temporal Interferometric Synthetic Aperture Radar (MTInSAR) techniques are gaining momentum in the monitoring of built regions affected by landslides. The presented research wants to provide an example of the benefit in using Copernicus C-band Sentinel-1 SAR products to support the management/mitigation strategies in case of building settlements in urban areas. To this aim, Sentinel-1 SAR acquisitions and ground meas-urements (i.e. high-precision geometric levelling) have been jointly used to investigate an ongoing instability occurrence, affecting the town of Chieuti, located in the Apulia region (Southern Italy). Furthermore, a geostatistical analysis has been developed in a Geographic Information System (GIS) to compare the Sentinel 1 SAR dataset with the results obtained from the ground-based geomatics observations. The study evidences the effectiveness of using Sentinel-1A SAR data as a long-term routine monitoring tool for millimetre-scale motions in areas involved by ground in-stabilities triggered by landslides. The outcomes of this analysis helped the design of the mitigation measures implemented for securing the study area, demonstrating once again the importance of satellite remote sensed SAR data in driving land management strategies and civil protection actions where potentially dangerous instability phenomena are underway