Table 3.
List of 20 different vegetation indices (VIs) computed in this study from the raw RGB and Multispectral bands.
| Vegetation Indices | Formulation | References |
|---|---|---|
| ExG (Excessive Greenness Index) | (2×G)−R−B | Woebbecke et al. (1995) |
| NDVI (Normalized Difference Vegetation Index) | (NIR−R)/(NIR+R) | Rouse (1974) |
| GNDVI (Green Normalized Difference Vegetation Index) | (NIR−G)/(NIR+G) | Gitelson et al. (2003a) |
| NDRE (Normalized Difference Red Edge Index) | (NIR−RE)/(NIR+RE) | Gitelson and Merzlyak (1997) |
| RVI (Ratio Vegetation Index) | NIR/R | Tucker (1979) |
| SCCCI (Simplified Canopy Chlorophyll Content Index) | NDRE/NDVI | Raper and Varco (2014) |
| SAVI (Soil Adjusted Vegetation Index) | (1 + 0.5)((NIR−R)/(NIR+R+0.5)) | Huete (1988) |
| EVI (Enhanced Vegetation Index) | (2.5×NIR−R)/(NIR+6×R−7.5×B+1) | Huete et al. (2002) |
| EVI2 (Enhamced Vegetation Index2) | (2.5×NIR−R)/(NIR+2.5×R+1) | Jiang et al. (2008) |
| MSAVI (Modified Soil Adjusted Vegetation Index) | [(2NIR+1)−√((2NIR+1)2−8(NIR−R))]/2 | Qi et al. (1994) |
| VARI (Visible Atmospherically Resistant Index) | (G−R)/(G+R−B) | Gitelson et al. (2002) |
| WDRVI (Wide Dynamic Range Vegetation Index) | (0.2×NIR−R)/(0.2×NIR+R) | Gitelson (2004) |
| RECI (Rededge Chlorophyll Index) | (NIR/RE)-1 | Gitelson et al. (2003b) |
| RE/R (Redegde to Red ratio) | RE/R | Ballester et al. (2013) |
| NIR/G (Near infrared to Green ratio) | NIR/G | Sripada et al. (2005) |
| RGBVI (Red Green Blue Vegetation Index) | (G−B×R)/(G2 +(B×R)) | Bendig et al. (2015) |
| GRVI (Green Red Vegetation Index) | (G−R)/(G+R) | Falkowski et al. (2005) |
| TCARI (Transformed Chlorophyll Absorption Reflectance Index) | 3[(RE−R)−0.2(RE−G)×(RE/R)] | Haboudane et al. (2002) |
| OSAVI (Optimized Soil Adjusted Vegetation Index) | (1 + 0.16)[(NIR−R)/(NIR+R+0.16)] | Rondeaux et al. (1996) |
| TCARI/OSAVI | TCARI/OSAVI | Haboudane et al. (2002) |
R, G, B, RE, and NIR represents Red, Green, Blue, Red-edge, and Near-infrared bands, respectively, and were obtained from multispectral imagery collected at different sampling dates during the 2021 and 2022 season.