Fig 1.
Location and administrative divisions of the study area.
The map of China (left) was provided by Ministry of Natural Resources of China (Approval number: GS(2019)1673).
Fig 2.
Coastal defense hierarchical diagram.
Table 1.
Local chronicles statistics.
Table 2.
Wei cities, Suo cities, beacon towers, post stations and urgent delivery stations statistics.
Table 3.
Post routes and urgent delivery routes statistics.
Fig 3.
Spatial distributions of Wei cities, Suo cities, beacon towers, post stations and urgent delivery stations.
Fig 4.
Hierarchy evaluation model of the information transmission efficiency.
Table 4.
The fundamental scale of absolute numbers [26].
Table 5.
P⬅{a1, a2, a3}.
Table 6.
P1⬅{a11, a12}.
Table 7.
P2⬅{a21, a22, a23}.
Table 8.
P3⬅{a31, a32, a33, a34}.
Table 9.
RI values [27].
Fig 5.
ViewShed of the beacon towers in different regions.
Fig 6.
Cost routes of the urgent delivery stations.
Fig 7.
Jurisdictions of the urgent delivery stations.
Table 10.
Evaluation index scores statistics.
Table 11.
Final scores statistics.