Table 2. Full name and abbreviation (Abbr.) of the spectral reflectance indices (SRI) used in this study and formulated using NIR/SWIR and SWIR/SWIR of the spectrum.

Full name of SRIs and Abbr.	Formula
NIR/SWIR and SWIR/SWIR spectrum
Reciprocal of moisture stress index (RMSI)	(R860/R1650)
Shortwave infrared water index (SWWI)	(R850 –R1650)/(R850 + R1650)
Normalized difference infrared index (NDII)	(R860 –R1650)/(R860 + R1650)
Normalized difference water index-2130 (NDWI-2130)	(R858 –R2130)/(R858 + R2130)
Normalized difference moisture index-1 (NDMI-1; 860;1640;2130)	860 –(R1640 –R2130) / 860 + (R1640 –R2130)
Moisture stress index (MSI)	(R1600/R820)
Ratio spectral index (RWC; RSI; 2264;1321)	(R2264/R1321)
Normalized difference moisture index-2 (NDMI-2; 2200; 1100)	(R2200 –R1100)/(R2200 + R1100)
Normalized difference spectral index (RWC; NDSI)	(R1222 –R2264)/(R1222 + R2264)
Normalized difference tillage index (NDTI)	(R1650 –R2215)/(R1650 + R2215)
Cellulose absorption index (CAI)	0.5 × (R2031 –R2211)–R2101