| Category | Parcel evaluation | Zone evaluation | Comprehensive grade |
|---|---|---|---|
| 1 | Upper | Upper | Upper |
| 2 | Upper | Middle | Middle |
| 3 | Upper | Lower | Middle |
| 4 | Middle | Upper | Middle |
| 5 | Middle | Middle | Middle |
| 6 | Middle | Lower | Lower |
| 7 | Lower | Upper | Middle |
| 8 | Lower | Middle | Lower |
| 9 | Lower | Lower | Lower |