Fig. 3: Cultural heritage kernel density analysis and multicultural origins.

a The density of agrarian cultural heritage (ACH). b The density of maritime fishing cultural heritage (MFCH). c The density of maritime trade cultural heritage (MTCH). In all three density maps, shading from light yellow to dark blue represents increasing kernel density values, with lighter yellow indicating lower concentrations and darker blue marking the highest clustering. d Agrarian cultural origins are highlighted in light green. e Maritime fishing cultural origins are shaded in light blue. f Maritime trade cultural origins are marked in cyan blue. g Multicultural origins are differentiated by type and current flow centrality. Single-type origins are represented with areas shaded by a single diagonal line, while compound-type origins are represented with areas shaded by crossed double diagonal lines. Centrality is further classified into first-level origins (dark brown), second-level origins (orange), and third-level origins (light orange). The county boundary is outlined in gray lines (drawn by authors).