Table 2.
Summary of selected vegetation indices published in the literature.
| Spectral index | Definition or equation | Reference |
|---|---|---|
| TWO BANDS | ||
| Optimal vegetation index (VIopt) | (1+0.45) × [(R800)2+1)/(R670+0.45)] | Reyniers et al., 2006 |
| Difference vegetation index (DVI) | R810−R560 | Richardson and Wiegand, 1977 |
| Re-normalized difference vegetation index (RDVI) | (R800-R670)/(R800+R670)1/2 | Roujean and Breon, 1995 |
| Pigment specific simple ratio chlorophyll b (PSSRb) | R800/R635 | Blackburn, 1998 |
| Modified simple ratio (MSR) | [R800/R670-1]/[(R800/R670)1/2 +1] | Chen, 2014 |
| Normalized difference red-edge index (NDRE) | (R790-R720)/(R790+R720) | Fitzgerald et al., 2006 |
| Soil adjusted vegetation index (SAVI) | (1-0.08) × (R825-R735)/(R825+ R735-0.08) | Huete, 1988 |
| Red-edge chlorophyll index-3 (CIred-edge3) | R790/R720−1 | Gitelson et al., 2005 |
| THREE BANDS | ||
| Difference index of the double-peak areas (DIDA) | (R755+R680-2 × R718)/(R755-R680) | Feng et al., 2014 |
| New double difference index (DDn) | 2 × R710-R660-R760 | Le Maire et al., 2008 |
| Modified chlorophyll absorption in reflectance index (MCARI-1) | 1.2 × [(2.5 × (R800-R670)−1.3 × (R800-R550)] | Haboudane et al., 2004 |
| Modified triangular vegetation index (MTVI1) | 1.2 × [1.2 × (R800-R550)−2.5 × (R670-R550)] | Haboudane et al., 2004 |
| Modified red-edge ratio (mRER) | (R759−1.8 × R419)/(R742−1.8 × R419) | Feng et al., 2015 |
| Modified red-edge ratio (mSR705) | (R750-R455)/(R705-R445) | Sims and Gamon, 2002 |
| Modified right-side peak area index (mRPA) | (R760/R600)1/2×(R760-R718) | This study |
| OVER THREE BANDS | ||
| SDr-SDb | Feng et al., 2008 | |
| Triangle vegetation index (TVI-3) | 60 × (Rnir-Rgreen)−100 × (Rred-Rgreen) | Broge and Leblanc, 2000 |
| Red-edge reflectance curve area (REFCA) | SUM(Ri/R780) i = 680–780 | Ren et al., 2011 |
R is the reflectance at a given wavelength. R800, R670, R635,…and R680 are the spectral reflectance values at 800, 670, 635…, and 680 nm, respectively. Rλ is the spectral reflectance at wavelength λ.