## 3 Results
### Comparison of the Estimation Ability of Vegetation Index for fPAR at the Entire Crop Season
\begin{table}
\begin{tabular}{c c c c c} \hline
**VI Name** & **Correlation** & **Equation** & **R2** & **RMSE** \\ \hline \multirow{4}{*}{NDVI} & Linear & \(fPAR=2.0245V1-1.0714\) & 0.5926 & 0.1460 \\  & Exponential & \(fPAR=0.0135e^{4145V1}\) & 0.6639 & 0.1350 \\  & Logarithmic & \(fPAR=0.897+1.4085\ln{(\rm VI)}\) & 0.5350 & 0.1479 \\  & Linear & \(fPAR=0.88471-0.0778\) & 0.3183 & 0.1896 \\  & Exponential & \(fPAR=0.1132e^{-5901V1}\) & 0.2793 & 0.2039 \\  & Logarithmic & \(fPAR=0.7987+0.6834\ln{(\rm VI)}\) & 0.3312 & 0.1812 \\  & Linear & \(fPAR=1.0278V-0.1327\) & 0.3710 & 0.1878 \\  & Exponential & \(fPAR=0.1047e^{22415V1}\) & 0.3271 & 0.1976 \\  & Logarithmic & \(fPAR=0.8652+0.7263\ln{(\rm VI)}\) & 0.3795 & 0.1810 \\  & Linear & \(fPAR=1.95131-0.7944\) & 0.6174 & 0.1314 \\  & Exponential & \(fPAR=0.0262e^{4178V1}\) & 0.5993 & 0.1379 \\  & Logarithmic & \(fPAR=1.0248+1.1763\ln{(\rm VI)}\) & 0.5595 & 0.1418 \\  & Linear & \(fPAR=0.0537 VI+0.2337\) & 0.5601 & 0.1513 \\  & Exponential & \(fPAR=0.2605e^{4101V1}\) & 0.4554 & 0.1846 \\  & Logarithmic & \(fPAR=-0.1525+0.4101\ln{(\rm VI)}\) & 0.6191 & 0.1408 \\  & Linear & \(fPAR=0.0189 VI+0.3206\) & 0.5625 & 0.1510 \\  & Exponential & \(fPAR=0.3101e^{0.0364V1}\) & 0.4403 & 0.1900 \\  & Logarithmic & \(fPAR=-0.2361+0.3266\ln{(\rm VI)}\) & 0.6569 & 0.1342 \\  & Linear & \(fPAR=0.9682 VI+0.1724\) & 0.2292 & 0.2510 \\  & Exponential & \(fPAR=-0.2016e^{225V1}\) & 0.2056 & 0.2608 \\  & Logarithmic & \(fPAR=1.014+0.4972\ln{(\rm VI)}\) & 0.2492 & 0.2342 \\  & Linear & \(fPAR=1.5195 VI-0.4365\) & 0.4828 & 0.1643 \\  & Exponential & \(fPAR=0.0561e^{32612V1}\) & 0.5029 & 0.1641 \\  & Logarithmic & \(fPAR=0.9571+0.8496\ln{(\rm VI)}\) & 0.4309 & 0.1722 \\  & Linear & \(fPAR=1.6303 VI-0.5253\) & 0.5099 & 0.1598 \\  & Exponential & \(fPAR=0.0453e^{3301V1}\) & 0.5252 & 0.1704 \\  & Logarithmic & \(fPAR=0.9679+0.8994\ln{(\rm VI)}\) & 0.4498 & 0.1698 \\  & Linear & \(fPAR=1.7019 VI-0.1852\) & 0.5899 & 0.1465 \\  & Exponential & \(fPAR=0.1022e^{3364 VI}\) & 0.5437 & 0.1615 \\  & Logarithmic & \(fPAR=1.1191+0.6148\log{(\rm VI)}\) & 0.5147 & 0.1593 \\  & Linear & \(fPAR=1.6419 VI-0.5382\) & 0.5065 & 0.1603 \\  & Exponential & \(fPAR=0.044e^{3563 VI}\) & 0.5718 & 0.1610 \\  & Logarithmic & \(fPAR=0.9693+0.9155\log{(\rm VI)}\) & 0.4486 & 0.1693 \\  & Linear & \(fPAR=1.2789 VI-2.853\) & 0.6184 & 0.1413 \\ MNDVI & Exponential & \(fPAR=0.0772e^{2735 VI}\) & 0.6649 & 0.1340 \\  & Logarithmic & \(fPAR=0.8524+0.5247\ln{(\rm VI)}\) & 0.4507 & 0.1697 \\  & Linear & \(fPAR=1.14475 VI-0.3471\) & 0.3939 & 0.1789 \\ SAVI & Exponential & \(fPAR=0.0643e^{31839 VI}\) & 0.3550 & 0.1921 \\  & Logarithmic & \(fPAR=1.0034+0.9054\log{(\rm VI)}\) & 0.3926 & 0.1791 \\  & Linear & \(fPAR=2.0953 VI-0.7524\) & 0.5131 & 0.1602 \\ OSAAVI & Exponential & \(fPAR=0.026e^{4993 VI}\) & 0.5088 & 0.1642 \\  & Logarithmic & \(fPAR=1.1456+1.1901\ln{(\rm VI)}\) & 0.4815 & 0.1642 \\  & Linear & \(fPAR=0.0555 VI+0.2298\) & 0.5663 & 0.1503 \\  & Exponential & \(fPAR=0.2583e^{1018 VI}\) & 0.4619 & 0.1874 \\  & Logarithmic & \(fPAR=-0.1415+0.4099\ln{(\rm VI)}\) & 0.6229 & 0.1401 \\  & Linear & \(fPAR=0.0194 VI-0.3379\) & 0.5652 & 0.1504 \\ CIR & Exponential & \(fPAR=-0.3205e^{0.0374 VI}\) & 0.4432 & 0.1925 \\  & Logarithmic & \(fPAR=-0.1098+0.2925\ln{(\rm VI)}\) & 0.6545 & 0.1346 \\ MNDVI & Linear & \(fPAR=-2.0363 VI-0.2734\) & 0.3038 & 0.1908 \\  & Exponential & \(fPAR=0.0939e^{-0.4207 VI}\) & 0.2924 & 0.1981 \\ NDBI & Linear & \(fPAR=-1.694 VI-0.1741\) & 0.5951 & 0.1445 \\  & Exponential & \(fPAR=0.1047e^{-3.5195 VI}\) & 0.5490 & 0.1983 \\ NDWI & Linear & \(fPAR=-2.2472 VI-1.0779\) & 0.6097 & 0.1423 \\  & Exponential & \(fPAR=0.0155e^{-4.719 VI}\) & 0.6166 & 0.149 3 \\  & Linear & \(fPAR=-1.04927\pm 0.1605\) & 0.2966 & 0.1924 \\ NIRV & Exponential & \(fPAR=0.1998e^{2725 VI}\) & 0.2582 & 0.2182 \\  & Logarithmic & \(fPAR=1.0382+0.4852\ln{(\rm VI)}\) & 0.3228 & 0.1890 \\  & Linear & \(fPAR=0.1447 VI-0.1454\) & 0.5749 & 0.1490 \\ MTCI & Exponential & \(fPAR=0.1176e^{0.2069 VI}\) & 0.4807 & 0.1845 \\  & Logarithmic & \(fPAR=-0.6513+0.7761\ln{(\rm VI)}\) & 0.6001 & 0.1464 \\ \hline \end{tabular}
\end{table}