A challenge in access measurement is that green space is notoriously heterogeneous. Parks differ in terms of size, quality, range of facilities, availability of organized recreation, or perceptions of safety among actual or potential users. They are designed to serve diverse communities and wide-ranging recreational needs. Parks also have reputations reflecting their use, repute, upkeep, and design quality. Such heterogeneity means compliance with uniform national standards for urban park space provision in the United States is difficult. These standards may even negatively impact some urban residents, prescribing blanket 231 solutions where locally specific interventions are needed.