Figure 1.

Each panel (A-F) has an aerial photo with GPS points (left) and a time series graphic (right). Basic numerical summaries are presented in the bottom of the photo. If bouts have no GPS data at all, a blank photo is shown. Above the graphic is diary-based place and trip information. Accelerometer counts (cyan) and GPS speeds (magenta) are plotted in the graphic. A black box shows bout duration, derived from the accelerometer, in the middle of the graphic. [A: Walk1-GPS example] The PA bout was non-dwell with GPS median speed of 3.2 kmh⁻¹ and therefore was classified as a walking bout, even though no walking trip was reported in the diary when the bout occurred. [B: Walk2-Diary example] The PA bout had no GPS data, but had time overlap with a diary-based walking trip, so was classified as a walking bout. [C: Walk3-Diary example] The PA bout had no GPS data, no walking trip was recorded in the diary near the bout, but since it had time overlap with a diary-based bus trip it was classified as a walking bout assumed to be associated with the bus trip. [D: Walk4-Diary example] The PA bout had no GPS data and no overlap with a diary-based trip, but had a diary-based walking trip 4.5 min after it and was thus classified as a walking bout assumed to be associated with the walking trip but with diary time errors. [E: NonWalk2-GPS example] The PA bout was a dwell bout (the GPS point cluster circle radius = 12.8ft) and thus was not a walking bout. [F: NonWalk3-Diary example] The PA bout had no GPS data, but occurred within a diary-based place and had no other diary-based trips close in time.