where Lij is the landslide susceptibility at the cell (i,j); n is the number of predisposing factors; and T is the aggregating function for calculating the overall landslide susceptibility for the cell (i,j). There can be different choices for the aggregating function T. The arithmetic mean is one of the aggregating functions that have been used in landslide-susceptibility studies ( Liu et al., 2004 and Zhu et al., 2004). We adapt the arithmetic mean aggregating function in this landslide-susceptibility mapping scenario as a simple illustration.