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Urban planning has shifted from "land-oriented" to "human-oriented" and metropolitan cities start to focus on 15-min life circle community planning during recent years. As multiple dimensions of living service facilities are included, proactive supervision and real-time evaluation are essential in the governance and spatial planning of large cities, referring to urban physical examination. This study proposes a community life circle diagnosis system based on multisource urban big data to evaluate the community public service facilities, in which the performance of urban living service, in terms of fairness, accessibility, and diversity were assessed, and the services related to the health and emergency facilities apart from the daily living service were investigated. Four representative Chinese megacities Beijing, Shanghai, Shenzhen, and Wuhan, were selected for the implementation and empirical analyses of the diagnosis system, which were further compared regarding the existing community life circle facility service. Then, situations in Shanghai in 2011, 2016, and 2021 were longitudinally compared to verify the influencing factors toward community life circle facilities. The results indicated that Shanghai has the highest quality of service of 15-min community life circle among the four Chinese cities, followed by Shenzhen, Wuhan, and Beijing, according to the average coverage rate of citywide living service facilities. However, the municipal government in Shanghai still needs to improve the investment in public resources in the suburbs, focusing on facilities related to elderly care, life security, and community travel. Findings of this study may assist metropolitan development with policy and funding priorities, by using urban big data together with traditional empirical data (e.g. social-economic data, built environment, etc.) to diagnose sustainable community development problems. [ABSTRACT FROM AUTHOR]

Community micro-renewal is an important aspect of urban regeneration. Residents, as the primary users of the community, have become a vital component of community micro-renewals. With the advent of participatory design, designers are no longer the dominant constructors of communities. Residents' participation is essential to current community micro-renewals, but the existing resident involvement still reflects a lack of initiative and an underutilization of potential. Instead, co-creation, in which residents can be deeply involved in the community micro-renewals, is becoming the mainstream. This paper categorizes co-creation models in community micro-renewals into three types according to the degree of residents' participation: the co-creation model based on common ideation, the co-creation model for resident participation in the design process, and the co-creation model of resident-led community regeneration. Three corresponding cases in Shanghai, China are analyzed in relation to specific scenarios and typologies. Each case study provides a contextualized interpretation of the characteristics associated with different types of co-creation. Increased residents' participation in the process of co-creation has been found to positively impact residents' identification with community micro-renewals and their intrinsic commitment to sustain them. Furthermore, highly participatory co-creation empowers residents to assume a higher level of responsibility for the project and mitigates the risk of uniformity. The contribution of this paper is to provide a theoretical basis for subsequent practices. Specifically, this research aims to facilitate a comprehensive integration of participatory design methodologies with community micro-renewal initiatives. [ABSTRACT FROM AUTHOR]