GIS-based landslide hazard evaluation: The importance of input factors

GIS-based landslide hazard analysis focuses on the relationships between landslide phenomena and predisposing factors such as the morphometric features of a given slope (i.e. slope, aspect, curvature). In this abstract we present and discuss the results of an analysis performed in a volcanic area SE of Rome (inner slopes of the Albano lake) based on two different morphometric data sets. The first one is derived by a DEM (10×10 m grid) extracted from the official cartography (CTR, scale 1:10.000); the other one is instead derived by a detailed DEM (1×1 m grid) resulting from a LIDAR survey performed on the study area. The first finding is that the availability of a more detailed DEM allow to better define the outlines of landslide areas, thus modifying the main input layer of the hazard analysis. In addition, the analysis showed significant differences in the landslide predisposition of morphometric parameters derived by the two DEMs.