The studied area is the ``Soulane'' of about km in size, is located at approximately North latitude, East longitude in the south of France with elevation ranging from 500 to 2100 m. This region is a well-revealing of the common agri-pastoral practices which have modified landscape this last 50th years. We have used only 3 maps :

• an altitude map(figure 10(a)),
• a map of frequency of forest fires established with forest fire reports of the agriculture state department (figure 10(b)). This frequency is coded in 5 frequencies (from 0 to 4),
• a forest map obtained from a classification of a sequence of aerial photographies (figure 10(c)).