Both Tulous (土楼) and Weilong Houses (围龙屋) are important types of traditional Hakka (客家) dwellings whose architectural morphology is closely related to the historical origin, social organisation, and cultural values of Hakkas. Previous studies focused on the influence of Chinese traditional etiquette systems and ritual values on the physical morphology of Hakka traditional dwellings, where ancestral halls are often the core of the entire building. This article selects six typical case studies of Tulous and Weilong Houses and launches a comparative study on their spatial configurations through quantitative analysis of space syntax. This study found that compared to Tulous, Weilong Houses exhibit decentralisation and gridification in their spatial structure, in addition to a decrease in defence capability and an increase in residential privatisation. The ancestral hall of the Tulou is still the spiritual and living centre of Tulou residents, located in the geometric centre and possessing high spatial configurational values. However, although the ancestral hall of the Weilong House is still located in the geometric centre of the entire building, it does not exhibit the highest spatial configurational values, indicating that the increase in secularisation and the decrease in ritualisation of Hakka communities inhabiting Weilong Houses resulted in the separation of secular space and ritual space. It coincides with the “Centre–Periphery” distribution characteristics of Hakka communities related to Tulous and Weilong Houses, reflecting the different community existence paradigms of the Hakkas “landed” and “rooted” in the Guangdong–Fujian–Jiangxi border area.

The outdoor thermal environment (OTE) is closely related to sustainable urban development and human living, and related research has attracted widespread attention. The research hotspots and research frontiers were obtained using CiteSpace to analyze 4473 relevant studies published in English from the Web of Science (WOS) core database from 1998 to 2023. The results show that (1) Hong Kong Polytechnic University, National University of Singapore, Chinese Academy of Sciences, Tsinghua University, and Harbin Institute of Technology are important in OTE research. China has the largest number of publications in the field of OTE, but the United States has the greatest centrality and significant influence. (2) The focus of OTE keyword clustering research is divided into four main categories: thermal environment perception, the thermal environment index, thermal environment quality, and thermal environment optimization. (3) The frontiers of OTE research have changed from focusing on environmental quality, thermal perception, numerical simulation, urban space, and thermal adaptation to thermal mitigation, energy conservation, energy consumption, and optimization strategies. Visualization research in the field of OTE helps to provide references for the direction of future research on improving climate change, human thermal comfort, urban planning, and pre-planning.