Fig. 17: Spatial coupling relationships between defense corridors, post roads, and the Great Wall System in Yuxian.
From: Machine-learning-based reconstruction of Ming-dynasty defensive corridors in Yuxian
a Defense corridor impact zones and the distribution of military settlements; b Spatial overlap between defense corridors and post road buffer zones (500 m, 1000 m); c Post road corridors traversing highly suitable defensive zones; d Spatial correspondence between defense corridors, the Ming Dynasty Great Wall (3 km buffer zone), and highly suitable defensive zones.
