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. Author manuscript; available in PMC: 2017 Sep 21.
Published in final edited form as: Trans GIS. 2016 Sep 19;21(4):764–781. doi: 10.1111/tgis.12231

Figure 1.

Figure 1

An example of mixed staying activities reflected by smartphone collected GPS points. In this figure, the subject first stayed inside building A before going to building B. However, the inaccuracy of GPS points made it difficult to distinguish the two sub-locations and to derive contextual information (e.g., inside or outside a building) about the subject’s activities.