Table 1.

Combination method of spectral data preprocessing and spectral transformation.

Preprocessing and Spectral Transformation
SG + R	SG + R + FD	SG + R + SD	SG + R + LOG
SG + NOR	SG + NOR + FD	SG + NOR + SD	SG + NOR + LOG
SG + MSC	SG + MSC + FD	SG + MSC + SD	SG + MSC + LOG
SG + SNV	SG + SNV + FD	SG + SNV + SD	SG + SNV + LOG

SG: Savitzky–Golay, R: reflectance, NOR: normalization, MSC: multiplicative scatter correction, SNV: standard normal variate, FD: first derivative, SD: second derivative, LOG: reciprocal logarithm.