Validation: water impact of European ash (Fraxinus excelsior). The table shows the output for several selected trees, while the entire table includes 109 trees provided by the i-Tree report. In addition, Δ(PET)i = PET(i-Tree)i – PET(GUS)i is calculated, taking into account all 109 trees, and the following results are obtained: Δ(PET)mean = −0.195, Δ(PET)median = 0.181, along with t-test statistics = −1.301 and P-value = 0.196, not rejecting the null hypothesis Δ(PET) = 0. PET (potential evapotranspiration); DBH (diameter at breast height); BAI (bark area index); LAI (leaf area index); PAI (plant area index).
| Plot | ID | Leaf area (m2) | DBH (cm) | Height (m) | Crown width (m) | Under-canopy area (m2) | BAI | LAI | PAI | PET (m3/yr) − i-Tree | PET (m3/yr) − GUS |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 131 | 36 | 2.4 | 8.5 | 10.0 | 1.0 | 0.8 | 2.7 | 3.1 | 5.8 | 0.1 | 0.1 |
| 198 | 26 | 2.0 | 7.0 | 11.5 | 1.0 | 0.8 | 2.4 | 2.5 | 4.9 | 0.1 | 0.1 |
| 37 | 1 | 9.1 | 7.5 | 6.0 | 2.0 | 3.1 | 0.2 | 2.9 | 3.0 | 0.3 | 0.4 |
| … | … | … | … | … | … | … | … | … | … | … | … |
| … | … | … | … | … | … | … | … | … | … | … | … |
| 198 | 20 | 131.8 | 19.5 | 14.0 | 6.0 | 28.3 | 0.1 | 4.7 | 4.8 | 4.1 | 4.0 |
| 131 | 74 | 12.2 | 8.8 | 10.0 | 2.0 | 3.1 | 0.4 | 3.9 | 4.2 | 0.4 | 0.4 |
| 11 | 3 | 116.4 | 16.6 | 10.0 | 6.0 | 28.3 | 0.1 | 4.1 | 4.2 | 3.7 | 3.7 |