A Comparison Between Traditional and Satellite Monitoring by Means of Dinsar Technique Within the Framework of the Construction of Metro Line 1 in Naples

The Naples Metro Line 1 is an important infrastructural work that extends for approximately 18 km, connecting 19 stations in the city. The project is developed in a particularly complex geological context, characterized mainly by soils and rocks of pyroclastic origin and marine sands. This article focuses on the monitoring of subsidence movements around the stations of Università and Toledo stations, as it is of particular geotechnical interest due to the dense urban and construction context surrounding it. Traditional monitoring operations carried out through optical leveling between 2002 and 2009, encompass both the underground stations and connecting tunnels. The aim of this study is to compare the data obtained through the remote sensing technique DInSAR (Differential Synthetic Aperture Radar Interferometry) using measurements from the ENVISAT (2002–2010) sensor, with the results of traditional monitoring. The data from the COSMO-SkyMed constellation, of the Italian Space Agency, are then analyzed to evaluate any posthumous movements that have occurred along the same section since 2010, therefore in the post-construction phases, in order to identify any critical issues that may require further investigation.