Supporting method of compact city planning in local metropolitan areas across prefectural borders

This study examines and visualizes a future urban structure of local metropolitan areas that extend over prefectural borders as in the case of Sinjiko‐nakaumi metropolitan areas located across Tottori prefecture and Shimane prefecture. First, we constructed an expert system based on prefectural and city administrative plans in the metropolitan urban area, showing a compact city model (Scenario 1). Second, we developed a compact city model to reflect potential development、 taking into account agricultural land conversions (Scenario 2). By comparing the results of these scenarios, we found that it is possible to visualize an intensive urban structure that takes into account the possibility of urban sprawl given that the conversion of agricultural land in suburban areas is only allowed at a certain level of development. Additionally, we identified inadequacies in existing compact‐city construction plans. To plan an effective urban structure for metropolitan areas situated on prefectural borders, it is important to emphasize the necessity of collaboration between municipalities in developing master plans for urban planning in areas located at or near borders. It is also necessary to review and redesign municipal master plans to ensure mutually convenient locations for facilities near borders and to regulate development in suburban areas.