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 | 0.72 | 1.49 | 696.91 | 0.65 | 1.70 | 37.19 | |
ELM | 0.68 | 1.56 | 758.14 | 0.68 | 1.64 | 35.77 | |
RF | 0.70 | 1.49 | 438.29 | 0.64 | 1.73 | 36.93 | |
Canopy height metrics | SMLR | 0.68 | 1.53 | 747.72 | 0.72 | 1.54 | 33.61 |
SVR | 0.70 | 1.52 | 697.85 | 0.73 | 1.49 | 32.66 | |
ELM | 0.69 | 1.50 | 747.92 | 0.72 | 1.54 | 33.72 | |
RF | 0.72 | 1.46 | 431.34 | 0.76 | 1.40 | 30.76 | |
VIs and canopy height metrics | SMLR | 0.72 | 1.43 | 717.41 | 0.75 | 1.46 | 31.77 |
SVR | 0.74 | 1.38 | 679.36 | 0.73 | 1.51 | 33.07 | |
ELM | 0.72 | 1.44 | 714.49 | 0.73 | 1.50 | 32.77 | |
RF | 0.76 | 1.33 | 375.06 | 0.78 | 1.34 | 29.31 |