针对气候变化下我国城市热岛效应加剧、极端天气频发，本项目拟用社交媒体数据研究城市室外空间人群热适应性与热环境作用机制，目的是创新室外热舒适研究方法、探索跨气候带城市人群室外热适应性理论，并为应对气候变化和热岛效应的适应性城市规划提供技术支持。项目拟在我国香港和北京的城市室外空间采集带地理标签的社交媒体数据（微博和推特），运用语句分词、情感分析、和主题建模等等 “大数据”方法筛选出和热环境相关的信息，并用跨尺度城市室外热环境模型测算个人尺度热环境并进行统计分析。团队将使用“小数据”方法校验“大数据”方法，通过社交媒体平台上发布在线问卷，在城市室外空间展开外场实验，运用行为观察、问卷调研和微气候测量，评价社交媒体数据方法在城市人群热适应性研究中的可行性和局限性。研究团队已在中国香港完成了试点研究，发现室外空间社交媒体活跃度、情感值与热环境的显著相关性。

Urban heat arising from both climate change and Urban Heat Island (UHI) effects takes a toll on urban life, affecting activity patterns, quality of life and health of living in cities. Understanding human perception and behavioral responses to the urban thermal environment is of importance to energy efficient and climate adaptive planning practices. Thermal adaptation of urban residents in outdoor urban space remains inconclusive in existing studies. Most studies rely on observations or field questionnaires (self-reported results); findings are often limited by sample size, study period and sites available. Results may not be generalizable across climate zones, societies and culture. . The aim of this study is to develop an analytical framework to measure outdoor activities and thermal adaption in open spaces. We hypothesize that activities and thermal preference uncovered in cyberspace is indicative to the real space. Hong Kong and Beijing, two major Chinese cities across climate zones with significant social media activities are selected. The project will 1) develop a new analytical framework to monitor the dynamics of human responses to heat stress in open space using social media data, 2) evaluate results from the above framework using traditional methods, i.e. online follow-up survey, field questionnaire, observation, and measurement of microclimate attributes, and 3) analyze the relationship between thermal-related topics posted on social media and the user’s in-situ thermal exposure calculated from urban microclimate models. A pilot study was conducted in Hong Kong using 302,633 Twitter data collected from May. 2016 to Jan. 2017, we take encouragement from the correlation between thermal exposure and social media activities. If successful, the study can enrich literature of thermal adaptation and contribute to climate-adaptive planning practices.