Optical Remote Sensing for Precursor Landslide Events: Two Case Studies

This paper focuses on identifying landslide precursors using remote sensing, crucial for mitigating catastrophic events near settlements and water bodies. The use of two different optical satellites (Sentinel-2 and Planet Dove) allowed for highlighting key information in the dynamics of landslide events. Two case studies Sarre Clou Neuf and Challand Saint Anselme showed changes in vegetation, humidity, and land surface before landslides. Sentinel-2 identified shifts in vegetation and moisture, while a fuzzy RGB approach delineated landslide areas. Challand Saint Anselme revealed a smaller-scale event, confirmed by Planet Dove imagery and on-site investigation. These findings emphasize the need for semi-automated monitoring in landslide-prone areas, crucial for disaster management and risk reduction.