Figure 1 | Scientific Reports

Figure 1

From: Understanding small Chinese cities as COVID-19 hotspots with an urban epidemic hazard index

Figure 1

Multi-layer transportation network model with detailed flow description. (a) Four layers of inter-city transportation (Air, Bus, Rail, Sail) between Chinese prefectural administrations. (b) Bi-partite categorization of network nodes (central cities vs. peripheral cities). (c) Cross-infection during inter-city travel due to path overlap. (d) Inbound/outbound flow during transit.

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