Applications and Advancements of Spaceborne InSAR in Landslide Monitoring and Susceptibility Mapping: A Systematic Review

Landslides pose significant threats to human safety and socio-economic development. In recent decades, interferometric synthetic aperture radar (InSAR) technology has emerged as a powerful tool for investigating landslides. This study systematically reviews the applications of spaceborne InSAR in landslide monitoring and susceptibility mapping over the past decade. We highlight advancements in key areas, including atmospheric delay correction, 3D landslide monitoring, failure time prediction, enhancements in spatial and temporal resolution, and integration with other technologies like the Global Navigation Satellite System (GNSS) and physical models. Additionally, we summarize various InSAR application strategies in landslide susceptibility mapping, identifying a gap between the static nature of most current studies and InSAR’s dynamic potential for capturing deformation velocity. Future research should integrate InSAR-derived factors with other dynamic variables like rainfall and soil moisture for dynamic susceptibility mapping and prediction. We also emphasize that further development of dynamic InSAR will require more efficient SAR data management and processing strategies.