ABSTRACT Past studies have stressed the importance of designing urban neighborhoods to be walkable and accessible to local amenities; however, the psychological benefits of urban design have been vastly understudied. The current study integrates theoretical insights from urban planning and environmental psychology literature in analyzing spatial relationships between third places, walkability, and positive mood across Los Angeles city blocks. To measure positive mood, this study utilized geotagged social media (Twitter) data to conduct sentiment analysis on tweets, using mood as a proxy for psychological well-being. Regression analyses revealed the independent and joint positive influences of third places and walkability on the expected number of positive tweets. The results indicated that more positive tweets were expected on blocks that (a) were more walkable and (b) had more third places. Notably, the number of third places on focal and surrounding blocks mattered more for psychological well-being on less walkable blocks. This research shows how big data can be leveraged by urban planners to make sense of human – environment relationships and the neighborhood context of well-being.
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