Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 7 6 2007 10.5194/nhess-7-637-2007 http://www.nat-hazards-earth-syst-sci.net/7/637/2007/ http://www.nat-hazards-earth-syst-sci.net/7/637/2007/nhess-7-637-2007.html http://www.nat-hazards-earth-syst-sci.net/7/637/2007/nhess-7-637-2007.pdf 637 650 2007-11-06 Identification and mapping of recent rainfall-induced landslides using elevation data collected by airborne Lidar F. Ardizzone francesca.ardizzone@irpi.cnr.it M. Cardinali M. Galli F. Guzzetti P. Reichenbach CNR IRPI, via della Madonna Alta 126, 06128 Perugia, Italy A high resolution Digital Elevation Model with a ground resolution of 2 m×2 m (DEM₂) was obtained for the Collazzone area, central Umbria, through weighted linear interpolation of elevation points acquired by Airborne Lidar Swath Mapping. Acquisition of the elevation data was performed on 3 May 2004, following a rainfall period that resulted in numerous landslides. A reconnaissance field survey conducted immediately after the rainfall period allowed mapping 70 landslides in the study area, for a total landslide area of 2.7×10⁵ m². Topographic derivative maps obtained from the DEM₂ were used to update the reconnaissance landslide inventory map in 22 selected sub-areas. The revised inventory map shows 27% more landslides and 39% less total landslide area, corresponding to a smaller average landslide size. Discrepancies between the reconnaissance and the revised inventory maps were attributed to mapping errors and imprecision chiefly in the reconnaissance field inventory. Landslides identified exploiting the Lidar elevation data matched the local topography more accurately than the same landslides mapped using the existing topographic maps. 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