Fig. 1.

Example of GPS data and the resulting activity space on a typical school day of one participant. On this day, the participant accrued 54.4 min of total MVPA: 22.5 min of school MVPA, 15.6 min of trip MVPA, and 16.2 min of other MVPA. Total travel duration was 50.7 min. For privacy, the student's residence has been masked with a black circle which portrays the approximate location of their home; the circle intersects with three Census Dissemination Areas (DA) representing 2664 residents in 2006 (DAs not shown). Trips are depicted as coloured lines. The activity space creates a 200 m buffer around these lines (bodies of water are excluded as they are likely not part of an activity space when someone travels between locations on land, even if travel is within 200 m of water). This figure illustrates the participant's use of different transportation modes within the same trip; Trips 1 and 2 comprise of a transit segment flanked by two walking segments. A good example of a School Day Activity Space, this figure contains complete GPS tracks denoting the participant's trips, and an activity space which successfully buffers the trips. The participant was a public high school student from Downtown Vancouver, sampled in October 2012.