Many shades of green: intrinsic and network properties of urban green areas

Urban green spaces are a vital component of public infrastructure, yet their evaluation often relies exclusively on either qualitative descriptions, aggregate metrics or basic quantitative thresholds. Thus, research frequently overlooks intrinsic attributes, spatial integration, functional accessibility, and the broader impact on urban liveability. This paper critically re-examines the legacy of Italy’s urban planning standards – specifically the Ministerial Decree 1444/1968, which introduced minimum green space requirements – to assess whether the prevailing metric-based paradigm has marginalized qualitative and locational dimensions. Through a comparative case study of three mid-sized Tuscan cities – Pisa, Lucca, and Grosseto – this research develops and applies an original methodology that integrates both intrinsic characteristics (typological, geometric, and structural) and extrinsic features (accessibility and configurational properties) of urban green spaces. Drawing on field surveys, spatial analysis, and Space Syntax techniques, the study constructs a composite evaluative framework to assess the actual usability and functional performance of green areas within the urban context. Findings reveal that a substantial proportion of green spaces are either residual or inaccessible, and are often poorly connected to the urban fabric despite formal compliance with legal standards. While national planning requirements have increased the quantity of public green space, these areas are frequently located on the urban periphery or insufficiently integrated into movement networks, thereby limiting their effectiveness. The proposed approach offers a lightweight yet robust tool for quali-quantitative assessment, enabling more nuanced evaluations and supporting context-sensitive planning practices. The study advocates for a renewed emphasis on design quality and locational integration in green infrastructure policies to enhance the equity, usability, and liveability of urban environments.