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UAV-based remote sensing of the slow-moving landslide Super-Sauze

In this paper we present the results of a remote sensing approach based on unmanned aerial vehicles (UAV), which enables high-resolution acquisition of slow moving landslides. We introduce the concept of a low cost UAV system and the image-processing based evaluation of the acquired photographs. In October 2008 a series UAV-borne photographs was acquired. These photographs have been combined to an ortho-mosaic of the Super-Sauze mudslide. The achievable ground cell resolution was in the range between 3 cm to 8 cm. A comparison between the achieved ortho-mosaic and an airborne ortho-mosaic from 2007 has been carried out. In the period between May 2007 and October 2008 displacements, varying between 2.7 m and 55.4 m have been detected and different structures, indicating variable deformation and sedimentation processes at the surface of the slope have been identified.