Structural quality mapping 2015 [7-stage evaluation]
| Representation in 1 stripe | Classes | Level of alteration |
 | Not assessed | Not assessed |
 | Classe 1 | Not altered |
 | Classe 2 | A little altered |
 | Classe 3 | Moderately altered |
 | Classe 4 | Clearly altered |
 | Classe 5 | Strongly altered |
 | Classe 6 | Very strongly altered |
 | Classe 7 | Completety altered |