Comparing landslide hazard maps

The objective of the method explained in this paper is to obtain a better insight in the decision rules applied by geomorphologists in the direct mapping of landslide hazard. This can be obtained by forcing geomorphologists to specify for each unit (polygon) in their hazard map the criteria that they used to classify the unit as high, medium or low hazard. When this is done systemically for an entire area, it is possible to analyze those criteria statistically, and to evaluate whether they can be grouped into general decision rules, or whether these criteria are completely site specific. The same area in the Alpago region in Italy was mapped at 1 : 5000 scale by three teams of experts individually. The different methods are presented and the results are compared.