Table 2 Distance metrics x that were used as edge weights to build inter-city network \(\mathcal {N}_{x}\)
Distance metric x | Notation | Directed? | Category | Description |
|---|---|---|---|---|
Euclidean distance | eij | Undirected | Physical | Euclidean distance between center of counties i and j |
Travel time | TTij | Directed | Physical | Driving time from i to j in usual state (GoogleMaps API) |
Road distance | RDij | Directed | Physical | Road distance on quickest route from i to j in usual state (GoogleMaps API) |
Mobility flow | Fij | Directed | Social | Inverse of the # of travelers from i to j in usual state (from mobile phones) |
# of overnight stays | Sij | Directed | Social | Inverse of the # of visitors from county i who stay overnight in county j in usual state (from mobile phones) |