**3. Classification of exclusion criteria (constraints).**

The exclusion criteria are constraints having for objective to limit research of suitable sites which do not tolerate any competition [10].

The classification consists in selecting various areas that represents a new plan of information for a required condition. Maps were classified into two categories: 1 was ranked to zones verifying the condition and 0 was ranked to the other zones. The resulting image is a Boolean image.

The last step consisted in combining, by superposition, the information contained in Boolean layers relative to the exclusion criteria mentioned above. The logical operator "AND" has been used in this part; it translates the intersection between conditions that must be absolutely satisfied.
