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In June 2005, a series of major rockfall events completely wiped out the\udBonatti Pillar located in the legendary Drus west face (Mont Blanc massif,\udFrance). Terrestrial lidar scans of the west face were acquired after this\udevent, but no pre-event point cloud is available. Thus, in order to\udreconstruct the volume and the shape of the collapsed blocks, a 3-D model has\udbeen built using photogrammetry (structure-from-motion (SfM) algorithms)\udbased on 30 pictures collected on the Web. All these pictures were taken\udbetween September 2003 and May 2005. We then reconstructed the shape and\udvolume of the fallen compartment by comparing the SfM model with terrestrial\udlidar data acquired in October 2005 and November 2011. The volume is\udcalculated to 292 680 m<sup>3</sup> (±5.6 %). This result is close to the\udvalue previously assessed by Ravanel and Deline (2008) for this same rock\udavalanche (265 000 ± 10 000 m<sup>3</sup>). The difference between these\udtwo estimations can be explained by the rounded shape of the volume\uddetermined by photogrammetry, which may lead to a volume overestimation.\udHowever it is not excluded that the volume calculated by Ravanel and\udDeline (2008) is slightly underestimated, the thickness of the blocks having\udbeen assessed manually from historical photographs

natural hazards and earth system sciences

Brief communication: 3-D reconstruction of a collapsed rock pillar from Web-retrieved images and terrestrial lidar data – the 2005 event of the west face of the Drus (Mont Blanc massif)