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Best results of species with second derivative data and their preprocessing at a spectral sampling range of 729–975 nm using PLSR.
| Species | Pre-Processing | LV | Calibration | Prediction (Validation) | RPD | |||
|---|---|---|---|---|---|---|---|---|
| R2 | RMSEC | R2 | RMSEP | Bias | ||||
| A | Autoscale | 11 | 0.775 | 1.8256 | 0.775 | 1.8775 | 0.090077 | 2.1411 |
| C | MSC + SNV | 10 | 0.662 | 1.2857 | 0.678 | 1.1832 | −0.11288 | 1.7917 |
| D | Autoscale | 7 | 0.659 | 2.1201 | 0.694 | 1.9648 | −0.085569 | 1.7813 |
| Gb | Second derivative | 8 | 0.769 | 0.88278 | 0.613 | 1.2167 | 0.16661 | 1.4958 |
