Abstract
Abstract. Event landslide inventory maps document the extent of populations of landslides caused by a single natural trigger, such as an earthquake, an intense rainfall event, or a rapid snowmelt event. Event inventory maps are important for landslide susceptibility and hazard modelling, and prove useful to manage residual risk after a landslide-triggering event. Standards for the preparation of event landslide inventory maps are lacking. Traditional methods are based on the visual interpretation of stereoscopic aerial photography, aided by field surveys. New and emerging techniques exploit remotely sensed data and semi-automatic algorithms. We describe the production and comparison of two independent event inventories prepared for the Pogliaschina catchment, Liguria, Northwest Italy. The two inventories show landslides triggered by an intense rainfall event on 25 October 2011, and were prepared through the visual interpretation of digital aerial photographs taken 3 days and 33 days after the event, and by processing a very-high-resolution image taken by the WorldView-2 satellite 4 days after the event. We compare the two inventories qualitatively and quantitatively using established and new metrics, and we discuss reasons for the differences between the two landslide maps. We expect that the results of our work can help in deciding on the most appropriate method to prepare reliable event inventory maps, and outline the advantages and the limitations of the different approaches.
Highlights
A landslide inventory map shows the location of mass movements that have left discernable features in an area (Pašek, 1975; Hansen, 1984; McCalpin, 1984; Wieczorek, 1984; Guzzetti et al, 2000, 2012)
The two inventories show landslides triggered by an intense rainfall event on 25 October 2011, and were prepared through the visual interpretation of digital aerial photographs taken 3 days and 33 days after the event, and by processing a very-high-resolution image taken by the WorldView-2 satellite 4 days after the event
For the 25.1 km2 Pogliaschina catchment, in the NW Apennines, northern Italy, we obtained two independent event landslide inventory maps showing landslides triggered by a high-intensity rainstorm that hit the area on 25 October 2011
Summary
A landslide inventory map shows the location of mass movements that have left discernable features in an area (Pašek, 1975; Hansen, 1984; McCalpin, 1984; Wieczorek, 1984; Guzzetti et al, 2000, 2012). A limited number of studies have tackled the problem of the comparison of two or more landslide maps (e.g., Carrara et al, 1992; Guzzetti et al, 2000; Brardinoni et al, 2003; Ardizzone et al, 2007; van Westen et al, 2006; Galli et al, 2008). This is unexpected, given the importance of establishing the quality of a landslide inventory for scientific investigations and practical purposes.
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