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The typical VIs selected for the assessment of tree spectral reflectance.
| Scale | Index | F. | Reference |
|---|---|---|---|
| Leaf | SIPI (Structure Insensitive Pigment Index) | (1) | Penuelas et al., 1995 [28] |
| mSR (Modified Simple Ratio) | (2) | Sims and Gamon, 2002 [29] | |
| SR3 (Simple Ratio 3) | (3) | Gitelson and Merzlyak, 1997 [30] | |
|
| |||
| Canopy | NDVI (Normalized Difference VI) | (4) | Tucker, 1979 [31] |
| RDVI (Renormalized Difference VI) | (5) | Roujean and Breon, 1995 [32] | |
| EVI (Enhanced VI) | (6) | Huete et al., 1997 [33] | |
