Understanding polyrationalities of space, actors, and policies on suburban densification

越来越多的人搬到城市，城市地区变得更加密集，空间变得更加稀缺。其结果是，房价上涨，导致市中心的士绅化和流离失所。与此同时，郊区还有未开发的致密化潜力。这种郊区密集化有可能缓解住房短缺的负面后果。此外，密实化被认为是城市规划通过减少净土地占用来应对气候变化缓解和适应的关键。但郊区的密集是棘手的，因为它满足了空间、参与者和政策的多元理性。空间的多元理性要求郊区是由其土地所有者不是根据一种逻辑，而是多种空间概念--空间作为领土、经济资产、社会地位等--在社会上构建--构思的。此外，郊区往往存在强烈的变革阻力，阻碍了密集化的实施。这种阻力源于行为者--即土地所有者和当地利益攸关方--对致密化的不同解释。此外，国家或城市规划的郊区密集化政策符合特定地点的空间政治。对土地政策的公共政策干预--土地政策--如果不考虑这些政策的多元合理性，则被认为是失败的。该项目旨在更好地理解空间、行为者和郊区密集化政策的多元性。它将探索不同的土地政策战略如何与土地所有者和当地利益攸关方的利益和机构相互作用，以塑造郊区密集化及其在不同规划系统中对郊区的影响。该项目的这一目标在方法和理论上都存在挑战。在案例研究中，对致密化过程进行了深入分析。为了探索多元性，该项目将数据科学和空间分析与社会人类学方法(文化理论)和不同机构背景下的空间规划结合起来。这种努力意味着将来自不同学科的知识、方法和理论结合起来，能够单独揭示每个要素--空间、行为者和政策--的多元理性，并将其结合起来。最终，SUBDENSE将地理空间数据和社会人口数据结合在一起，以分析和通报多元合理性。这就需要评估和加强数据的适合性，以便比较分析实地的致密化现象，并在致密化仪表盘中进行沟通和决策。

More and more people move to cities, urban areas become denser, space more scarce. As a consequence, house prices increase, leading to gentrification and displacement in city centres. At the same time, there is untapped potential for densification in suburban areas. Such suburban densification bears the potential of alleviating the negative consequences of housing shortage. In addition, densification is considered critical by urban planning to tackle climate change mitigation and adaptation by reducing net land uptake. But suburban densification is tricky as it meets plural rationalities of space, actors, and policies. Plural rationalities of space entail that suburban areas are socially constructed - conceived - by its landowners not by one logic, but multiple conceptions of space - space as territory, as economic asset, as social status, etc - coexist. In addition, there is often strong resistance to change in suburban areas, impeding the implementation of densification. Such resistance stems from different interpretations of densification by actors - i.e. landowners and local stakeholders. Furthermore, suburban densification policy by national or urban planning meets locationally specific politics of space. Public policy interventions in land – land policy – that does not take into account these plural rationalities of policy are deemed to fail. This project seeks to better understand the polyrationalities of space, actors and policies on suburban densification. It will explore how diverse strategies of land policy interact with landowners’ and local stakeholders’ interest and agency to shape suburban densification and their impact on suburbia across different planning systems. There are methodological and theoretical challenges with this aim of the project. Densification processes are analyzed in-depth in case studies. To explore polyrationalities, data science and spatial analysis is combined in this project with socio-anthropological approaches (Cultural Theory) and spatial planning across different institutional contexts. Such an endeavour implies to combine knowledge, methodologies and theories from different disciplines, able to reveal polyrationalities of each element alone - space, actors, and policies - and in combination. Ultimately, SUBDENSE combines geospatial and socio-demographic data to analyse and inform on polyrationalities. This entails to assess and enhance the fitness of data for comparative analysis of understanding densification phenomena on the ground as well as for communication and decision-making in a densification dashboard.