Table 1.

Definition of geographical accessibility calculation models.

Method	Description	Equation
NN2SFCA	Geographical accessibility score	$A_{i }=\frac{S_j^{opt}\ast f\left(d_{i{j}_{NN}}\right)}{{{\displaystyle \sum }}_k{P}_k\ast f\left(d_{j_{NN}k}\right)}$ $f\left(d_{ij}\right)=\left\{\begin{array}{c}1,d_{ij}=d_{i{j}_{NN}}\le 3 \mathrm{km}\\ \frac{3}{d_{ij}}{d}_{ij}=d_{i{j}_{NN}}>3 \mathrm{km}\\ 0,d_{ij} \ne d_{i{j}_{NN}} \end{array}\right\}$ $A_e=\frac{S}{P}$
M0	Before optimization	$S_j^{opt}$ = 1
M1	Optimal supply capacity allocation taking the maximum operator	${\mathrm{S}}_j^{max}=A_e\ast {\displaystyle {\displaystyle \sum }_k}{P}_k\ast f\left(d_{j_{NN}k}\right)\ast ma{x}_i\left(\frac{1}{f\left(d_{i{j}_{NN}}\right)}\right)$ ${\mathrm{S}}_j^{opt}=\frac{S}{{{\displaystyle \sum }}_j{S}_j^{max}}\ast S_j^{max}$
M2	Optimal supply capacity allocation taking the average operator	${\mathrm{S}}_j^{avg}=A_e\ast {\displaystyle {\displaystyle \sum }_k}{P}_k\ast f\left(d_{j_{NN}k}\right)\ast av{g}_i\left(\frac{1}{f\left(d_{i{j}_{NN}}\right)}\right)$ ${\mathrm{S}}_j^{opt}=\frac{S}{{{\displaystyle \sum }}_j{S}_j^{avg}}\ast S_j^{avg}$
M3	Optimal supply capacity allocation taking the minimum operator	${\mathrm{S}}_j^{min}=A_e\ast {\displaystyle {\displaystyle \sum }_k}{P}_k\ast f\left(d_{j_{NN}k}\right)\ast mi{n}_i\left(\frac{1}{f\left(d_{i{j}_{NN}}\right)}\right)$ ${\mathrm{S}}_j^{opt}=\frac{S}{{{\displaystyle \sum }}_j{S}_j^{min}}\ast S_j^{min}$