## 3 Results and Discussion
### Analysis of Final Suitability Map Excluding Extreme-Temperature Regions  
The final suitability map, created by removing the extreme-temperature regions from the composite suitability map, was analyzed. Among the environmental factors for analyzing suitable cultivation sites for GE, the extreme-temperature regions, where summer temperatures exceed 30 \({}^{\circ}\)C and winter temperatures are below \(-\)15 \({}^{\circ}\)C, covered an area of 32,055.06 ha. Regions with summer temperatures above 30 \({}^{\circ}\)C were primarily located in the northwestern part of Muju County in areas with relatively low elevations. In contrast, regions with winter temperatures below \(-\)15 \({}^{\circ}\)C were widely distributed in the southeastern part of Muju County. This area includes Deogyusan Mountain (altitude 1614 m), which has a relatively high elevation (Figure 3). Extreme-temperature regions were removed from the four composite suitability maps generated by the different classification methods, and the final suitability maps were created and the areas analyzed by grade (Figure 4). Compared to the composite suitability map, the most notable changes were the common increases in the area proportions of the SS and PSS by 0.1-4.2% and 2.2-4.1%p, respectively, while the area proportion of the US decreased by 3.3-7.7%p. Additionally, the area proportion of the PUS decreased by 0.8%p and 0.9%p in Qu and EI, respectively (Table 4). This is due to the inclusion of a large area classified as a US in the extreme-temperature regions, resulting in a relative increase in the area proportion of the SS or PSS. When examining the classification methods, in the final suitability map reclassified by NB, the SS was 1667.18 ha, which was 11.0% of 15,114.14 ha. This represents a 1.6%p increase compared with the composite suitability map. The proportion of the PSS area increased by 2.2%p, showing the highest increase in NB. In contrast, the proportion of the US population decreased by 4.2%p (Table 4). \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Classification Method** & **Grade** & **Area (ha, \%)** & **Change** \\ \hline \multirow{4}{*}{NB 2  & SS 3  & 1667.18 (11.0) & 1.6 4  & PSS & 4134.60 (27.4) & 2.2 \\  & PUS & PUS & 8561.26 (56.6) & 0.3 \\  & US & PUS & 751.10 (5.0) & \(-\)4.2 \\ \cline{2-4}  & Total & 15,114.14 (100.0) & \(-\) \\ \hline \multirow{4}{*}{Qu} & SS & 4530.94 (30.0) & 4.2 \\  & PUS & 4139.02 (27.4) & 3.7 \\  & PUS & 3562.12 (23.6) & \(-\)0.8 \\  & US & 2882.06 (19.1) & \(-\)7.1 \\ \cline{2-4}  & Total & 15,114.14 (100.0) & \(-\) \\ \cline{2-4}  & SS & 58.72 (0.4) & 0.1 \\  & PSS & 4472.22 (29.6) & 4.1 \\  & PUS & 10,368.05 (68.6) & \(-\)0.9 \\  & US & 215.15 (1.4) & \(-\)3.3 \\ \cline{2-4}  & Total & 15,114.14 (100.0) & \(-\) \\ \hline \multirow{4}{*}{GI} & SS & 1071.69 (7.1) & 1.1 \\  & PSS & 3459.25 (22.9) & 3.1 \\ \cline{1-1}  & PUS & 6169.69 (40.8) & 3.5 \\ \cline{1-1}  & US & 4413.51 (29.2) & \(-\)7.7 \\ \cline{1-1} \cline{2-4}  & Total & 15,114.14 (100.0) & \(-\) \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Final area proportions and changes after excluding extreme-temperature regions for the four-grade reclassification of the composite suitability map. Figure 3: Map of extreme-temperature regions. Red areas indicate regions with summer temperatures \(\geq 30\)\(\lx@sectionsign\)C and blue areas indicate regions with winter temperatures \(\leq-15\)\(\lx@sectionsign\)C.  
In the final suitability map reclassified by Qu, the area of the SS was 4530.94 ha, which is 30.0% of the total area, making it the largest SS area among the four classification methods. Additionally, the SS area increased by 4.2%p compared to the composite suitability map, which was also the largest increase among the four classification methods. Furthermore, the area proportion of USs decreased by 7.1%p, and the area proportion of the PUS decreased by 0.8%p (Table 4). In the composite suitability map reclassified by Qu, the differences in area proportions between grades were small, ranging from 0.7 to 2.1%p (see Table 3).