Table 1 Spectral index and calculation formula.
From: Estimating soil profile salinity under vegetation cover based on UAV multi-source remote sensing
Feature variable | Formulation | Reference |
|---|---|---|
NDSI | NDSI = \(\frac{R-NIR}{R+NIR}\) | |
NDSI-reg | NDSI-reg = \(\frac{RedEdge-NIR}{RedEdge+NIR}\) | |
BI | BI = \(\sqrt{{R}^{2}+{NIR}^{2}}\) | |
SI1 | SI1 = \(\sqrt{G\times R}\) | |
SI1-reg | SI1-reg = \(\sqrt{G\times RedEdge}\) | |
SI2 | SI2 = \(\sqrt{{G}^{2}+{R}^{2}+{NIR}^{2}}\) | |
SI2-reg | SI2-reg = \(\sqrt{{G}^{2}+{RedEdge}^{2}+{NIR}^{2}}\) | |
SI3 | SI3 = \(\sqrt{{G}^{2}+{R}^{2}}\) | |
SI3-reg | SI3-reg = \(\sqrt{{G}^{2}+{RedEdge}^{2}}\) | |
SI-T | SI-T = \(100\times R/NIR\) | |
S1 | S1 = \(B/R\) | |
S2 | S2 = \(\frac{B-R}{B+R}\) | |
S3 | S3 = \(G\times R/B\) | |
S5 | S5 = \(B\times R/G\) | |
SI | SI = \(\sqrt{B\times R}\) | |
NDVI | NDVI = \(\frac{NIR-R}{NIR+R}\) | |
NDVI-reg | NDVI-reg = \(\frac{NIR-RedEdge}{NIR+RedEdge}\) | |
DVI | DVI = \(NIR-R\) | |
DVI-reg | DVI-reg = \(NIR-RedEdge\) | |
EVI | EVI = \(2.5\times \frac{NIR-R}{NIR+6R-7.5B+1}\) | |
EVI-reg | EVI-reg = \(2.5\times \frac{NIR-RedEdge}{NIR+6RedEdge-7.5B+1}\) | |
TVI | TVI = \(0.5\times \frac{120\times \left(NIR-G\right)}{200\times \left(R-G\right)}\) | |
NDGI | NDGI = \(\frac{G-R}{G+R}\) | |
SR | SR = \(NIR/R\) | |
MSAVI | MSAVI = \(\frac{\left(2NIR-1\right)-\sqrt{{\left(2NIR+1\right)}^{2}-8\left(NIR-R\right)}}{2}\) | |
OSAVI | OSAVI = \(1.16\times \frac{NIR-R}{NIR+R+0.16}\) | |
SAVI | SAVI = \(1.5\times \frac{NIR-R}{NIR+R+0.5}\) | |
VDVI | VDVI = \(\frac{2G-\left(R+B\right)}{2G+\left(R+B\right)}\) | |
VARI | VARI = \(\frac{G-R}{G+R+B}\) | |
GNDVI | GNDVI = \(\frac{NIR-G}{NIR+G}\) | |
NRCT | NRCT = \(\frac{Ti-Tmin}{Tmax-Tmin}\) |
