Beyond land use mix, walkable trips. An approach based on parcel-level land use data and network analysis

Land use mix is one of the cornerstones for urban sustainability, in opposition to functional segregation and zoning policies. Land use mix is a prerequisite for urban proximity dynamics, healthier lifestyles and public space vitality. However, methodological shortcomings to its measurement remain and are responsible for the unexpected weak association with pedestrian activity. This study puts forward a novel method to reframe, measure and map land use mix as ‘walkable trips’, a closer approach to its benefits based on functional and spatial complementarity. The method draws on newly available cadastral microdata at the parcel-level that, combined with trip generation rates and network analysis tools, enable a detailed assessment and mapping of potential for walkable trips, as well as a proxy to the spatial patterns of urban vitality, in line with the principle of the 15-minute city. The method is applied to the case of the Madrid metropolitan area.

土地利用混合度（Land use mix）是城市可持续发展的核心基石之一，与功能隔离与分区规划政策形成鲜明对立。土地利用混合度是实现城市邻近性动态演化、塑造健康生活方式以及激活公共空间活力的必要前提。然而，当前其量化方法仍存在方法论缺陷，这正是导致其与步行活动关联度意外偏弱的核心原因。本研究提出一种全新方法，将土地利用混合度重新定义、量化并可视化为“可步行出行量”，该框架基于功能与空间互补性，更贴合其效益的本质内涵。该方法依托地块层面最新可得的地籍微观数据，结合出行生成率与网络分析工具，可实现可步行出行潜力的精细化评估与可视化制图，同时可作为城市活力空间格局的代理变量，契合15分钟城市（15-minute city）的发展原则。该方法已应用于马德里大都市区案例。