## 4 Results
By the Otsu \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Place**} & \multirow{2}{*}{**Sensor**} & \multirow{2}{*}{**Acquisition Date**} & \multirow{2}{*}{**NDWI**} & \multirow{2}{*}{**Threshold**} & \multirow{2}{*}{**BCV**} & \multirow{2}{*}{**CV**} & \multicolumn{2}{c}{**OA**} & \multirow{2}{*}{**Kappa**} & \multicolumn{2}{c}{**LSW Area**} \\  & & & & & & & **(\%)** & & **(\%)** \\ \hline \multirow{8}{*}{Region I} & \multirow{8}{*}{TM} & \multirow{8}{*}{2010-05-02} & NDWI\({}_{\mathrm{T2,4}}\) & \(-\)0.052 & 0.047 & 0.456 & 93.19 & 0.8440 & 22.89 \\  & & & NDWI\({}_{\mathrm{T2,5}}\) & \(-\)0.013 & 0.083 & 0.618 & 96.33 & 0.9133 & 20.85 \\  & & & NDWI\({}_{\mathrm{T2,7}}\) & 0.243 & 0.057 & 0.515 & 95.47 & 0.8939 & 20.77 \\ \cline{2-10}  & & & NDWI\({}_{\mathrm{A4,6}}\) & \(-\)0.294 & 0.026 & 0.341 & 94.23 & 0.8673 & 22.43 \\  & & & NDWI\({}_{\mathrm{A4,7}}\) & \(-\)0.265 & 0.043 & 0.438 & 95.54 & 0.8962 & 21.57 \\  & & & NDWI\({}_{\mathrm{A4,8}}\) & 0.166 & 0.090 & 0.638 & 95.89 & 0.9040 & 21.33 \\  & & & NDWI\({}_{\mathrm{A4,9}}\) & 0.134 & 0.111 & 0.713 & 96.76 & 0.9235 & 20.73 \\  & & & NDWI\({}_{\mathrm{A4,10}}\) & 0.289 & 0.078 & 0.592 & 95.86 & 0.9034 & 21.34 \\ \hline \multirow{8}{*}{Region II} & \multirow{8}{*}{TM} & \multirow{8}{*}{2005-09-09} & NDWI\({}_{\mathrm{T2,4}}\) & \(-\)0.093 & 0.031 & 0.522 & 95.18 & 0.7819 & 9.61 \\  & & & NDWI\({}_{\mathrm{T2,5}}\) & 0.054 & 0.071 & 0.768 & 95.94 & 0.8097 & 9.00 \\  & & & NDWI\({}_{\mathrm{T2,7}}\) & 0.406 & 0.036 & 0.531 & 95.43 & 0.7902 & 9.37 \\ \cline{2-10}  & & & NDWI\({}_{\mathrm{A4,6}}\) & \(-\)0.201 & 0.005 & 0.197 & 96.19 & 0.8231 & 9.16 \\  & & & NDWI\({}_{\mathrm{A4,7}}\) & \(-\)0.173 & 0.008 & 0.240 & 96.49 & 0.8349 & 8.90 \\  & & & NDWI\({}_{\mathrm{A4,8}}\) & 0.214 & 0.015 & 0.302 & 96.56 & 0.8372 & 8.84 \\  & & & NDWI\({}_{\mathrm{A4,9}}\) & 0.243 & 0.018 & 0.325 & 97.73 & 0.8818 & 7.25 \\  & & & NDWI\({}_{\mathrm{A4,10}}\) & 0.295 & 0.013 & 0.245 & 96.53 & 0.8337 & 8.61 \\ \hline \multirow{8}{*}{Region III} & \multirow{8}{*}{ETM\({}^{+}\)} & \multirow{8}{*}{2003-03-29} & NDWI\({}_{\mathrm{E2,4}}\) & 0.242 & 0.019 & 0.288 & 87.72 & 0.7050 & 22.21 \\  & & & NDWI\({}_{\mathrm{E2,5}}\) & 0.256 & 0.030 & 0.378 & 91.60 & 0.7862 & 19.36 \\ \cline{1-1}  & & & NDWI\({}_{\mathrm{E2,7}}\) & 0.410 & 0.023 & 0.315 & 90.80 & 0.7671 & 19.60 \\ \cline{1-1} \cline{2-10}  & & & NDWI\({}_{\mathrm{A4,6}}\) & \(-\)0.331 & 0.018 & 0.294 & 91.33 & 0.7752 & 19.53 \\ \cline{1-1}  & & & NDWI\({}_{\mathrm{A4,7}}\) & \(-\)0.313 & 0.023 & 0.334 & 92.36 & 0.8042 & 19.03 \\ \cline{1-1}  & & & NDWI\({}_{\mathrm{A4,8}}\) & 0.122 & 0.033 & 0.393 & 93.62 & 0.8348 & 18.54 \\ \cline{1-1}  & & & NDWI\({}_{\mathrm{A4,9}}\) & 0.035 & 0.040 & 0.416 & 93.88 & 0.8432 & 19.03 \\ \cline{1-1}  & & & NDWI\({}_{\mathrm{A4,10}}\) & 0.188 & 0.031 & 0.367 & 93.12 & 0.8241 & 19.11 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: NDWI forms, statistical results, associated sensors and bands of the three regions. criterion, we conclude that the NDWI model based on the 0.525-0.605\(\upmu\)m green band and the 1.550-1.750 \(\upmu\)m SWIR band of the ALI sensor is most suitable for image segmentation. Hence, the NDWI model using the green band and the 1.550-1.750 \(\upmu\)m SWIR band of the ALI sensor, namely, \(\mathrm{NDWI_{A4,9}}\), is the best indicator for the delineation of water body information from a comprehensive view of water-body information enhancement and image segmentation. A secondary choice is \(\mathrm{NDWI_{A4,8}}\), followed by \(\mathrm{NDWI_{A4,10}}\), \(\mathrm{NDWI_{A4,7}}\), and \(\mathrm{NDWI_{A4,6}}\). For the TM sensor in Region I, Table 3 indicates that the combination of the green channel (Band 2, 0.520-0.600 \(\upmu\)m) and the SWIR channel (Band 5, 1.550-1.750 \(\upmu\)m), namely, \(\mathrm{NDWI_{T2,5}}\), is the best indicator for water-body information delineation, followed by \(\mathrm{NDWI_{T2,7}}\) and \(\mathrm{NDWI_{T2,4}}\). This is consistent with the results based on the analysis of laboratory spectral data [38].