| Criteria | Geology | Slope | Altitude | Land use |
| Geology | 1 | 1/3 | 1/7 | 1/3 |
| Altitude | 7 | 5 | 1 | 3 |
| Slope | 3 | 1 | 1/7 | 3 |
| Land use | 3 | 1/3 | 1/3 | 1 |