Index | Formula | References |
---|---|---|
Indirect water-sensitive spectral VIs | ||
 Normalized difference vegetation index (NDVI) | (Rnir − Rred)/(Rnir+ Rred) | [42] |
 Red edge normalized ratio (NRred edge) | (R750 − R710)/(R750 + R710) | [43] |
 Green chlorophyll index (CIgreen) | (R750/R550) − 1 | [44] |
 Red edge chlorophyll index (CIred edge) | (R750/R710) − 1 | [44] |
Direct water-sensitive spetral VIs | ||
 Water index (WI) | R900/R970 | [45] |
 Moisture stress index (MSI) | R1600/R820 | [46] |
 Simple ratio water index (SRWI) | R860/R1240 | [47] |
 Normalized difference water index (NDWI) | (R860 − R1240)/(R860 + R1240) | [48] |
 Normalized difference water index centered at 1640 nm (NDWI1640) | (R858 − R1640)/(R858 + R1640) | [49] |
 Normalized difference water index centered at 2130 nm (NDWI2130) | (R858 − R2130)/(R858 + R2130) | [49] |