Analysis of Spatial Accessibility of Agritourism Units in Albania through Network Modeling in GIS and Graph Theory

Agritourism in Albania depends on how easily visitors can reach farms and rural guesthouses from the main cities. This paper measures that accessibility by combining network analysis in QGIS with graph theory. Road data from OpenStreetMap and the OpenRouteService plugin were used to calculate shortest routes, in distance and travel time, from Tirana, Shkodër, Vlorë and Korçë to every known agritourism unit. Modeling the road network as a weighted graph G = (V, E, ω), we computed mean distance, coefficient of variation, centrality measures and global efficiency. Tirana is the closest to the units (mean distance 78.10 km), Korçë the most remote (206.60 km), and Shkodër shows the widest spread between units (CV = 0.685). Global efficiency is low, E(G) = 0.00864. Scenario tests indicate that cutting distances by 15% on selected segments raises efficiency by 17.7%, and that investing in high-centrality nodes outperforms dispersed spending.