Tracking landslide displacements by multi-temporal DTMs: A combined aerial stereophotogrammetric and LIDAR approach in western Belgium

The study of small and/or slow reactivations of landslides requires describing their displacements over decades, which may be done with accurate multi-temporal digital terrain models (DTMs). We applied aerial stereophotogrammetry to build the historical topographies of old deep-seated landslides close to Oudenaarde in the Flemish Ardennes (West Belgium) at different dates. Three precise aerotriangulations (1996, 1973, 1952) were carried out....