Form and function revisited: urban activity clusters driven by urban form types

The relationship between urban form and urban activity has long been debated but remains difficult to operationalize empirically. This study presents a computational pipeline integrating urban morphometrics and place-based activity data to examine how distinct urban form types associate with functional composition and visit intensity. Five north-western German cities serve as an analytical laboratory. Their post-war reconstruction produced a spatial coexistence of pre-war compact fabrics and modernist reconstructed areas within the same urban tissue, enabling direct morphological comparison across planning paradigms. Results reveal recurring spatial-functional configurations across urban form types and consistently show that high ground-floor density and functional diversity concentrate in morphological types corresponding to pre-war fabrics, while post-war reconstructed areas show systematically lower activity levels, reflecting the enduring impact of historical planning decisions on present-day urban environments. Functional diversity proves a stronger predictor of visit intensity than physical density alone. These findings contribute empirical grounding to theoretical claims about density and urban vitality and demonstrate a transferable methodology applicable to other urban contexts combining morphologically distinct fabrics.