TABLE 3.
Vegetation indices used in this study.
| Category | Features | Expression** | References |
| DVI | Difference vegetation index | NIR-R | Jordan, 1969 |
| MTCI | MERIS terrestrial chlorophyll index | (NIR-RE)/(RE-R) | Dash and Curran, 2004 |
| NDVI | Normalized differential vegetation index | (NIR-R)/(NIR + R) | Tucker et al., 1979 |
| GNDVI | Green normalized difference vegetation index | (NIR-G)/(NIR + G) | Gitelson and Merzlyak, 1998 |
| NDRE | Normalized difference red-edge index | (NIR-RE)/(NIR + RE) | Sims and Gamon, 2002 |
| RENDVI | Red-edge normalized difference vegetation index | (RE-R)/(RE + R) | Sims and Gamon, 2002 |
| RVI | Ratio vegetation index | NIR/R | Birth and Mcvey, 1968 |
| RERVI | Red-edge ratio vegetation index | NIR/RE | Vincini and Frazzi, 2009 |
| PSRI | Plant senescence reflectance index | (R-G)/NIR | Merzlyak et al., 1999 |
| WSRI | Weed Spectral Resistance Index | (RE-R)/(RE-B) | This paper |
**B, G, R, RE, and NIR represent blue, green, red, red-edge, and near-infrared bands, respectively.