Fig. 1

a Example of Euclidean and network buffers. This figure shows 1000 meter Euclidean and network buffers around a home location. The Euclidean buffer measures 1000 meters in all directions from the home location as the crow flies. The network buffer measures 1000 meters from the home location using all available road networks. b Examples of measuring availability for the built environment feature of parks. This figure shows availability, measured through the number of parks within the home neighborhood built environment (i.e. participant buffer). In this example, park density is one, for both the Euclidean and network buffers, since only Park 1 falls within both buffers, while Park 2 falls outside both buffers. As such, this measure captures the density of parks or how many parks are available within the participants home neighborhood environment. c Examples of measuring accessibility for the built environment feature of parks. This figure shows accessibility measured through distance to the par from participant's home. In this example, distance from the particpant's home to the nearest park (Park 1) is 853 meters. As a note, the nearest built environment feature being measured, may not always be within the participant centered buffer