Input variables | Technique | Calibration (N = 201) | Validation (N = 85) | ||||
---|---|---|---|---|---|---|---|
R 2 | RMSE (t/ha) | AIC | R 2 | RMSE (t/ha) | rRMSE (%) | ||
VIs | SMLR | 0.69 | 1.52 | 742.63 | 0.70 | 1.58 | 34.49 |
SVR | 0.69 | 1.53 | 696.27 | 0.64 | 1.75 | 38.13 | |
ELM | 0.69 | 1.52 | 759.25 | 0.64 | 1.73 | 37.27 | |
RF | 0.70 | 1.51 | 423.87 | 0.69 | 1.61 | 34.06 | |
Canopy height metrics | SMLR | 0.68 | 1.53 | 747.72 | 0.72 | 1.54 | 33.61 |
SVR | 0.68 | 1.56 | 708.20 | 0.70 | 1.55 | 33.71 | |
ELM | 0.65 | 1.65 | 751.30 | 0.71 | 1.55 | 33.63 | |
RF | 0.73 | 1.44 | 398.32 | 0.74 | 1.39 | 30.95 | |
VIs and canopy height metrics | SMLR | 0.72 | 1.43 | 717.41 | 0.75 | 1.46 | 31.77 |
SVR | 0.71 | 1.50 | 592.05 | 0.73 | 1.51 | 33.10 | |
ELM | 0.72 | 1.45 | 733.02 | 0.73 | 1.51 | 32.77 | |
RF | 0.76 | 1.34 | 369.23 | 0.78 | 1.34 | 28.98 |