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Table 2 Distance metrics x that were used as edge weights to build inter-city network \(\mathcal {N}_{x}\)

From: Mobile phone data reveals the importance of pre-disaster inter-city social ties for recovery after Hurricane Maria

Distance metric xNotationDirected?CategoryDescription
Euclidean distanceeijUndirectedPhysicalEuclidean distance between center of counties i and j
Travel timeTTijDirectedPhysicalDriving time from i to j in usual state (GoogleMaps API)
Road distanceRDijDirectedPhysicalRoad distance on quickest route from i to j in usual state (GoogleMaps API)
Mobility flowFijDirectedSocialInverse of the # of travelers from i to j in usual state (from mobile phones)
# of overnight staysSijDirectedSocialInverse of the # of visitors from county i who stay overnight in county j in usual state (from mobile phones)