Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Some spectral vegetation indices used for vegetation cover estimation
| Index | Equation | Reference |
|---|---|---|
| Simple ratio | ||
| TM4/3 | TM4/TM3 | Jordan, 1969 |
| TM5/3 | TM5/TM3 | Lu et al., 2004 |
| TM5/4 | TM5/TM4 | Lu et al., 2004 |
| TM5/7 | TM5/TM7 | Lu et al., 2004 |
| Normalized different vegetation indices | ||
| NDVI | (TM4 – TM3)/(TM4 + TM3) | Rouse et al., 1974 |
| NDVI53 | (TM5 – TM3)/(TM5 + TM3) | Lu et al., 2004 |
| NDVI54 | (TM5 – TM4)/(TM5 + TM4) | Lu et al., 2004 |
| NDVI57 | (TM5 – TM7)/(TM5 + TM7) | Lu et al., 2004 |
| NDVI32 | (TM3 – TM2)/(TM3 + TM2) | Lu et al., 2004 |
| GNDVI | (TM4 – TM2)/(TM4 + TM2) | Gitelson et al., 1996 |
| NDII | (TM4 – TM5)/(TM4 + TM5) | Hardisky et al, 1983 |
| NDII7 | (TM4 – TM7)/(TM4 + TM7) | Hardisky et al, 1983 |
| NDWI | (TM2 – TM5)/(TM2 + TM5) | Lacaux et al., 2007 |
| NDWI7 | (TM2 – TM7)/(TM2 + TM7) | Lacaux et al., 2007 |
| Complex vegetation indices | ||
| SAVI | (TM4 – TM3)/(TM4 + TM3 + L)(1 + L) | Huete, 1988 |
| EVI | G(TM4 – TM3)/(TM4 + C1TM3 – C2TM1)+L | Huete, 1997 |
| ARVI | (TM4 – 2TM3 + TM1)/(TM4 + 2TM3 – TM1) | Lu et al., 2004 |
| GEMI | ξ(1 – 0.25ξ) – ((TM3 – 0.125)/(1 – TM3)) | Lu et al., 2004 |
| ASVI | ((2TM4 + 1) – √((2TM4 + 1)2 – 8(TM4 – 2TM3 + TM1)))/2 | Lu et al., 2004 |
| MSAVI | ((2TM4 + 1) – √((2TM4 + 1)2 – 8(TM4 – 2TM3)))/2 | Lu et al., 2004 |
Parameters of the models for the accuracy estimation
| Fusion techniques | R2 | Correlation | MMA |
|---|---|---|---|
| MLR (RapidEye, 4th band ++ PALSAR, HH band) | 0.698 | 0.837 | 0.575 |
| IHS (RapidEye, 4st band + PALSAR, HH band) | 0.530 | 0.731 | 0.591 |
| HPF (RapidEye, 4th band + + PALSAR, HH band) | 0.643 | 0.804 | 0.652 |
| WT (RapidEye, 4th band + PALSAR, HH band) | 0.370 | 0.614 | 0.623 |
| WIHS (RapidEye, 4th band + +PALSAR, HH band) | 0.476 | 0.694 | 0.604 |