Assessment of Spatial Equality and Social Justice of Urban Park Distribution from Park Category Perspective: Evidence from Shanghai, China

Urban parks deliver vital ecosystem services and enhance residents’ well-being globally, yet equitable access remains challenging in high-density cities. The prevailing planning paradigms predominantly rely on proximity-based metrics, overlooking critical interactions between demographic diversity, differentiated social demands, and park typology distinctions. Moreover, the existing studies frequently examine aggregate green space distributions without categorically analyzing justice implications. This study develops a geospatial–quantitative framework integrating spatial equality and social justice metrics, applied in Xuhui District, Shanghai. Key findings reveal the following: (1) spatial inequality characterized by large parks clustered in low-density peripheries, while high-density central zones lack adequate park coverage; (2) significant social justice deficits for priority groups (elderly, youth, low-income), exacerbated by insufficient consideration of socioeconomic needs; (3) pronounced disparities in justice across park types, with pocket parks exhibiting the most severe inequities. Consequently, we recommend prioritizing the social demand in park allocation and implementing community-centered pocket park development. This study not only diagnoses spatial–environmental injustices in high-density urban cores but also provides a transferable framework for equitable park planning.