Table 2.
Summary of the RGB-based vegetation index.
| VI | Abbreviation | Equation | Reference |
|---|---|---|---|
| Rn | Rn | =R/R(max) | Arroyo, Guijarro, & Pajares et al. (2016) (Arroyo et al., 2016) |
| Gn | Gn | =G/G(max) | |
| Bn | Bn | =B/B(max) | |
| r | r | =Rn/(Rn+Gn+ Bn) | Guijarro et al. (2011) (Guijarro et al., 2011) |
| g | g | =Gn/(Rn+Gn+ Bn) | |
| b | b | =Bn/(Rn+Gn+ Bn) | |
| Color Index of Vegetation Extraction | CIVE | =18.78745+(0.44r)-(0.88g)+(0.385b) | Kataoka et al. (2003) (Kataoka et al., 2003) |
| Combined 1 | COMB1 | =(0.25ExG)+(0.3EXGR)+(0.33CIVE)+(0.12VEG) | Guijarro et al. (2011) |
| Combined 2 | COMB2 | =(0.36ExG)+(0.47CIVE)+(0.17VEG) | Guijarro et al. (2011) |
| Excess Green | ExG | =(2g)-r-b | Woebbecke et al. (1995) (Woebbecke et al., 1995) |
| Excess Green Minus Excess Red | EXGR | =ExG-(1.4r)-g | Guijarro, & Pajares (2011) (Guijarro et al., 2011) |
| Ratio Green Red Index | GRI | =G/R | Li et al. (2010) (Li et al., 2010) |
| Green Red Vegetation Index | GRVI | =(G-R)/G+R | Gitelson et al. (2002) (Gitelson et al., 2002) |
| Modified Green Red Vegetation Index | MGRVI | =(G2-R2)/(G2+R2) | Bendig et al. (2015) (Bendig et al., 2015) |
| Plant Pigment Tatio | PPRb | =(G-B)/(G+B) | Metternicht et al. (2010) (Metternicht, 2010) |
| RGB Vegetation Index | RGBVI | =((G2-(R*B))/((G2+(R*B)) | Bendig et al. (2015) |
| Soil Adjusted Vegetation Index | SAVI | =1.5(G-R)/(G+R+0.5) | Li et al. (2010) |
| Visible Atmospherically Resistant Index | VARI | =(G-R)/(G+R-B) | Gitelson et al. (2002) |
| Visible Difference Vegetation Index | VDVI | =(2G-R-B)/(2G+R+B) | Wang et al. (2015) (Wang et al., 2015) |
| Vegetation Index | VEG | =g/rab(1-a)∴a=0.667 | Hague, Tillett, & Wheeler (2006) (Hague et al., 2006) |
| Woebbecke Index | WI | =(g-b)/|r-g| | Woebbecke et al. (1995) |
R, G, and B represent the DN variables from digital image red, green, and blue bands, respectively.