The geographer expert has defined a body of knowledge which specifies favorable areas for a landscape evolution and more precisely for a forest extension:

• if the forest is near (less than20 meters) or in a frequently burnt areas (more than 4 fires), then there is no chance for an extension of the forest (rule 1, 2 and 3);
• near the forest, there is a chance for an extension if the forest dynamic is big (rule 4);
• the forest cannot grow above 1700 m. (rule 5).