Table 1.
Vegetation indices considered to determine tree water status, using wavelengths within the VIS-NIR range.
| Vegetation index | Acronym | Equation | Reference |
|---|---|---|---|
| Chlorophyll Vegetation Index | CVI | (ρNIR/ρG) * (ρR+ρG) | Vincini et al. (2008) |
| Green Index | GI | ρG/ρR | Zarco-Tejada et al. (2005) |
| Green Normalized Difference Vegetation Index | GNDVI | (ρNIR−ρG)/(ρNIR+ρG) | Gitelson et al. (1996) |
| Modified Soil-Adjusted Vegetation Index | MSAVI | 0.5 * {2 ρNIR +1 – SQRT[(2 ρNIR+1)2 – 8 (ρNIR – ρR)]} | Qi et al. (1994) |
| Normalized Differential Greenness Index | NDGI | (ρG−ρR)/(ρG+ρR) | Pôças et al. (2015) |
| Normalized Difference RedEdge Index | NDRE | (ρNIR−ρRedEdge)/(ρNIR+ρRedEdge) | Maccioni et al. (2001) |
| Normalized Difference Vegetation Index | NDVI | (ρNIR−ρR)/(ρNIR+ρR) | Rouse et al. (1974) |
| Water Index | WI | ρR/ρNIR | Peñuelas et al. (1993) |
G, Green; R, Red; NIRm, Near Infrared spectral bands; ρ, reflectance.