Insar-Based Stability Evaluation of a Motorway: The Oran-Tlemcen Segment of Algeria's East-West Highway as a Case Study

Monitoring road infrastructure and its spatiotemporal dynamics is crucial for environmental, economic, and social well-being. Advanced methods, such as Persistent Scatterer Interferometry (PSI), allow vertical displacements to be detected at the sub-centimeter level. In this study, PSI is used to monitor the vertical displacements of the western section of the East-West Algerian highway, from Maghnia in Tlemcen to Oran. 60 Sentinel-1 radar images are used for this purpose. The radar interferometry is compared with the results of time series spectral analysis of the points identified on the highway. In addition, PSI interferometry makes it possible to detect potential degradation zones which can serve as a support for identifying the parts of the highway to be maintained.