## 3 Results
### Visual Quality Evaluation
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**SRR** & **Indices (\%)** &
\begin{tabular}{c} **Image** \\ **Fusion** \\ \end{tabular} & **ARVI** & **EVI** & **GNDIVI** & **NDVI** & **OSAVI** & **SAVI** \\ \hline \multirow{8}{*}{1:10 (GF2+ Landsat-8 (40 m))} & & GS & **92.11** & **88.77** & **92.73** & **88.93** & **88.92** & **88.93** \\  & & Ehlers & 91.65 & 87.46 & 92.12 & 87.65 & 87.66 & 87.65 \\  & CC & PC & 90.74 & 85.58 & 89.81 & 85.76 & 85.76 & 85.77 \\  & & MIHS & 90.72 & 85.70 & 91.47 & 86.44 & 86.42 & 86.42 \\  & & HPF & 89.33 & 86.93 & 88.12 & 82.33 & 75.83 & 75.85 \\  & & GS & **23.05** & **30.58** & **21.84** & **30.34** & **30.33** & **30.32** \\  & & Ehlers & 23.42 & 32.24 & 22.72 & 31.65 & 31.63 & 31.65 \\  & & PC & 24.79 & 34.43 & 25.65 & 34.26 & 34.21 & 34.26 \\  & & MIHS & 26.18 & 36.12 & 25.01 & 34.94 & 34.93 & 34.93 \\  & & HPF & 51.32 & 34.13 & 31.39 & 53.89 & 53.36 & 53.47 \\ \hline \multirow{8}{*}{1:12 (GF2+ Landsat-8 (48 m))} & & GS & **91.88** & **88.43** & **92.54** & **88.60** & **88.59** & **88.60** \\  & & Ehlers & 91.34 & 86.52 & 91.52 & 87.15 & 87.15 & 87.16 \\  & CC & PC & 90.54 & 85.21 & 89.65 & 85.44 & 85.43 & 85.47 \\  & & MIHS & 89.54 & 84.92 & 90.52 & 85.00 & 85.00 & 85.11 \\  & & HPF & 88.63 & 86.13 & 87.52 & 81.83 & 75.13 & 75.15 \\  & & GS & **23.43** & **31.02** & **22.10** & **30.75** & **30.79** & **30.75** \\  & & Ehlers & 24.03 & 33.40 & 23.55 & 32.45 & 32.45 & 32.43 \\  & & PC & 25.00 & 34.82 & 25.84 & 34.55 & 34.55 & 34.44 \\  & & MIHS & 25.20 & 34.93 & 24.17 & 33.84 & 33.04 & 33.05 \\  & & HPF & 52.52 & 35.63 & 32.19 & 54.09 & 54.26 & 54.42 \\ \hline \multirow{8}{*}{1:15 (GF2+ Landsat-8 (60 m))} & & GS & **91.17** & **88.19** & **92.40** & **88.36** & **88.35** & **88.36** \\  & & Ehlers & 90.55 & 85.79 & 91.52 & 87.15 & 87.15 & 87.16 \\ \cline{1-1}  & CC & PC & 90.42 & 84.98 & 89.55 & 85.25 & 85.24 & 85.24 \\ \cline{1-1}  & & MIHS & 89.54 & 84.92 & 90.52 & 85.00 & 85.00 & 85.11 \\ \cline{1-1}  & & HPF & 88.14 & 85.43 & 86.02 & 81.24 & 74.53 & 74.65 \\ \cline{1-1}  & & GS & **23.45** & **31.32** & **22.30** & **31.04** & **31.08** & **31.05** \\ \cline{1-1}  & & Ehlers & 24.87 & 34.21 & 23.96 & 33.24 & 33.24 & 33.25 \\ \cline{1-1}  & RMSE & PC & 25.00 & 34.82 & 25.84 & 34.55 & 34.55 & 34.56 \\ \cline{1-1}  & & MIHS & 26.18 & 36.12 & 25.01 & 34.94 & 34.93 & 34.92 \\ \cline{1-1}  & & HPF & 53.21 & 36.13 & 33.21 & 56.21 & 56.36 & 56.43 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Quality of FVI result in multi-sensor fusion (values in bold font indicate good quality). \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**RVI and Fusion** & **Same-Sen.** & **Multi-Sen.** & **Same-Sen.** & **Multi-Sen.** & **Same-Sen.** & **Multi-Sen.** \\
**Algorithms** & **ARVI(1 m)** & **EV(18 m)** & **NDVI(1 m)** & **GNDV(18 m)** & **OSAVI(1 m)** & **SAVI(8 m)** \\ \hline RVI (1 m, 8 m) & & & & & & \\ GS (1:6) & & & & & & \\ Ehlers (1:6) & & & & & & \\ PC (1:6) & & & & & & \\ MHHS (1:6) & & & & & & \\ HPF (1:6) & & & & & & \\ \hline RVI and Fusion & Same-Sen. & Multi-Sen. & Same-Sen. & Multi-Sen. & Same-Sen. & Multi-Sen. \\ Algorithms & ARVI(1 m) & EVI(4 m) & NDVI(1 m) & GNDVI(4 m) & OSAVI(1 m) & **SAVI(4 m)** \\ \hline RVI and Fusion & Same-Sen. & Multi-Sen. & Multi-Sen(R) & Same-Sen. & Multi-Sen. & Multi-Sen(R) \\ Algorithms & ARVI(1 m) & EVI(50 m) & NDVI(4 m) & GNDVI(1 m) & OSAVI(50 m) & **SAVI(4 m)** \\ \hline RVI (1, 50, 4 m) & & & & & \\ GS (1:10) & & & & & \\ Ehlers (1:10) & & & & & \\ PC (1:10) & & & & & \\ MHHS (1:10) & & & & & \\ HPF (1:10) & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Visual quality of FVI result in single/multi-sensor fusion. The visual quality analysis was based on a selective way to include different FVI maps for all types of image fusion. For example, the same-sensor FVI result is shown for ARVI, NDVI and OSAVI for SRR 1:6 and 1:8 and multi-sensor FVI results are shown for EVI, GNDVI and SAVI in GF1 PAN (8 m) with GF4 MS (50 m) in SRR 1:6, GF2 PAN (4 m) with Landsat-8 OLI (30 m) in SRR 1:8.