## 3 Results and Discussion  
### Analysis of Composite Suitability Map by Classification Method  
To identify suitable cultivation sites for GE, an initial weighted sum map was created using the weighted sum function with 11 environmental factors, excluding the two extreme-temperature factors (Figure 2). This map was then reclassified using four classification methods to compare the composite suitability maps. Among the classification methods, Qu reclassified the SS into the largest area. NB and EI reclassified the PUS into the largest areas within their respective methods. In the case of EI, even though the weighted score range was the same for each grade, there were significant differences in the areas of the grades. The GI reclassified the US as the largest area (Table 3). Figure 2: Initial weighted sum map. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Classification Method** & **Grade** & **Area (ha, \%)** & **Weighted Score Range** \\ \hline \multirow{6}{*}{NB z} & SS y & 4425.24 (9.4) & 7.97–9.96 (1.99) x \\  & PSS & 11,870.49 (25.2) & 7.48–7.97 (0.49) \\  & PUS & 26,565.21 (56.3) & 6.80–7.48 (0.69) \\  & US & 4308.26 (9.1) & 5.48–6.80 (1.32) \\ \cline{2-4}  & Total & 47,169.20 (100.0) & 5.48–9.96 (4.48) \\ \hline \multirow{6}{*}{Qu} & SS & 12,154.09 (25.8) & 7.78–9.96 (2.18) \\  & PSS & 11,162.89 (23.7) & 7.31–7.78 (0.47) \\  & PUS & 11,508.54 (24.4) & 6.97–7.31 (0.33) \\  & US & 12,343.68 (26.2) & 5.48–6.97 (1.49) \\ \cline{2-4}  & Total & 47,169.20 (100.0) & 5.48–9.96 (4.48) \\ \hline \multirow{6}{*}{EI} & SS & 129.41 (0.3) & 8.84–9.96 (1.12) \\  & PSS & 12,024.68 (25.5) & 7.72–8.84 (1.12) \\  & PUS & 32,800.01 (69.5) & 6.60–7.72 (1.12) \\  & US & 2215.10 (4.7) & 5.48–6.60 (1.12) \\ \cline{2-4}  & Total & 47,169.20 (100.0) & 5.48–9.96 (4.48) \\ \cline{2-4}  & SS & 2826.45 (6.0) & 8.15–9.96 (1.81) \\  & PSS & 9327.64 (19.8) & 7.72–8.15 (0.43) \\  & PUS & 17,609.01 (37.3) & 7.29–7.72 (0.43) \\  & US & 17,406.10 (36.9) & 5.48–7.29 (1.81) \\ \cline{2-4}  & Total & 47,169.20 (100.0) & 5.48–9.96 (4.48) \\ \cline{2-4}  & SS & 2826.45 (6.0) & 8.15–9.96 (1.81) \\  & PSS & 9327.64 (19.8) & 7.72–8.15 (0.43) \\ GI & PUS & 17,609.01 (37.3) & 7.29–7.72 (0.43) \\  & US & 17,406.10 (36.9) & 5.48–7.29 (1.81) \\ \cline{2-4}  & Total & 47,169.20 (100.0) & 5.48–9.96 (4.48) \\ \hline \hline \end{tabular}  
* NB = Natural breaks (Jenks), Qu = Quantile, EI = Equal interval, and GI = Geometric interval. y 58 = Suitable site, PSS = Possibly suitable site, PUS = Probably unsuitable site, and US = Unsuitable site. y Parentheses indicate the width of the weighted score range.  
\end{table} 
Table 3: Area proportions and weighted score ranges for the four-grade reclassification of composite suitability map by classification method. Examining the classification methods, the reclassification results using NB showed that out of the total 47,169.20 ha, 4425.24 ha (9.4%) were classified as an SS, with the PUS accounting for the highest proportion (56.3%) (Table 3). Despite having the widest weighted score range (1.99), the area of the SS was reclassified as the second smallest. This reflects the characteristic of NB to maximize the differences between grades [49]. The reclassification results using Qu showed that the SS accounted for 12,154.09 ha, which is 25.8% of the total area, making it the highest proportion for the SS. In Qu, the weighted score range was the widest for the SS at 2.18, and the narrowest was for the PUS. However, there were no significant differences in the area proportions for each grade (Table 3). The reclassification results using EI showed that the weighted score range was the same for all grades at 1.12. However, the SS accounted for only 129.41 ha or 0.3% of the total area. In contrast, the PUS accounted for 69.5% of the total area, and when combined with the US, they accounted for 74.2% of the total area (Table 3). This indicates that despite the EI reclassification with the same weighted score range [49], the initial weighted sum map had a relatively high distribution of low scores.