Despite the widespread application of public open space (POS) in urban planning and health research, there remains an issue of how POS is defined and measured. Irrespective of the definition, POS is a land use, which can be represented spatially and interpreted through spatial analysis. This research aims to contribute to the process of defining and creating POS data and highlights how outcomes can be modified by changing the input data. Specifically, this research developed a validated spatial dataset of public open space (VPOS) for Metropolitan Adelaide to enable evidence based research for...