Table 1.
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 |
[i] Note: TM(X) is corresponding Landsat TM/ETM+ spectral band
Figure 1.
Results visualization of merging the PALSAR band (HH mode) with RapidEye multispectral image using various data fusion approaches
Figure 2.
Relation of forest AGB with the merged RapidEye 4th spectral band and HH PALSAR band using HPF approach
Figure 3.
Relation of forest AGB with the merged RapidEye 4st spectral band and HH PALSAR band using IHS approach
Figure 4.
Relation of forest AGB with the merged RapidEye 4th spectral band and HH PALSAR band using WT approach
Figure 5.
Relation of forest AGB with the merged RapidEye 4th spectral band and HH PALSAR band using WIHS approach
Table 2.
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 |