Parameters and scoring function for the tree condition index (TCI) model. Adapted from Webster (1979).
| TCI | 5 | 4 | 3 | 2 | 1 |
|---|---|---|---|---|---|
| Trunk | Sound and solid throughout | Minor damage | Early decay signs | Extensive decay, hollowness, cambium damage | Same as 2, but cross section is a half-circle |
| Crown | Dense, evenly balanced crown | Dense, slightly unbalanced crown | Thin or severely imbalanced crown | Thin and slightly imbalanced crown | Thin and severely imbalanced crown |
| Roots | Three or more visible and evenly balanced root flares (< 2 cm deep) | Three or more visible and slightly unbalanced root flares (< 2 cm deep) | Less than 3 visible or severely unbalanced root flares (< 2 cm deep) | No visible root flares and structural roots (2 cm to 15 cm deep) | Structural roots (> 15 cm deep) |