| Criteria | Géologie | Altitude | Pente | Os |
| Geology | 1 | 1/3 | 1 | 1/7 |
| Altitude | 7 | 1 | 9 | 7 |
| Slope | 1 | 1/9 | 1 | 1/7 |
| Land use | 7 | 1/7 | 7 | 1 |