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. 2015 Mar 16;5:9136. doi: 10.1038/srep09136

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(a–d) Consecutive Flight length correlation of all transportation modes (Car/Taxi/Bus, Walk/Run, Subway/Train, Bike) in the GeoLife dataset. A high density of points are near diagonal line l_t = l_t_{+ 1}, identifying a small difference l_t₊₁ − l_t in the same transportation mode between two time steps.