Small scale population definition
Small scale population means that one path in the network can be found to evacuate everyone safely and quickly, and "large scale population " means that multiple paths are needed to evacuate at the same time. Differences in population scale will lead to very different path planning plans. For small scale populations, the path with minimal health consequences can be found using the shortest path algorithm. While when the population scale is large, if the fewer people evacuate at the right time, the more people waiting for evacuation at the source node and the longer the stay time, the more serious the health