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. Author manuscript; available in PMC: 2017 Jun 8.
Published in final edited form as: Trans GIS. 2016 Apr 12;20(6):869–886. doi: 10.1111/tgis.12181

Figure 2.

Figure 2

Definition and characteristics of point angle. (a). Definition of point angle; (b) Point angle of walking points; (c). Point angle of staying points. Due to the location error, GPS points of indoor and outdoor staying activities exhibit a ‘clustering’ pattern, which leads to narrower point angles than those of walking or other transportation.