The Renewal of Lost Space under Overpasses in Chengdu City Based on Residents’ Requirements for Cultural Services: The Case of the Longtan Overpass

In modern urban development, utilizing the space under overpasses (SUO) contributes to connecting the cityscape and facilitating the transformation of SUO into a public urban space. However, existing studies sometimes fail to properly take into account user requirements, resulting in the neglect of the SUO by the population. The solutions proposed are based on the assumption that the SUO can be renewed, but there is no thorough evaluation methodology to determine if the current state of the SUO can be renewed and in which areas it needs renewal. In this research, all the overpasses within the Third Ring Road in Chengdu are taken as samples. Based on cultural ecosystem services (CES) and external spatial quality (ESQ), an evaluation system for the renewal potential of SUO was established and the overpass with the most potential for regeneration was selected: the Longtan Overpass. Further, the KANO model was used to explore the categories of residents’ requirements for indicators of CES in the space under Longtan Overpass, so as to propose targeted renewal strategies. This study found a positive correlation between the satisfaction of residents living near Longtan Overpass and the natural aesthetics and facade landscape of the SUO. It also suggests that enhancing cultural service indicators such as sports, human aesthetics, customs and humanities, and geographical history can improve the attractiveness of the SUO. This study also found that quantitatively assessing the value of SUO through ecosystem cultural services is feasible, which provides new ideas and methods for updating SUO. These findings help urban designers understand how people feel.