Accuracy of iPhone Locations: A Comparison of Assisted GPS, WiFi and Cellular Positioning

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Positional Accuracy of Assisted GPS Data from High-Sensitivity GPS-enabled Mobile Phones (2011, background): “Inoneof the few recent empirical studies on the subject, Zandbergen (2009) compared the performance of A-GPS on Apple’s 3G iPhone to regular GPS receivers.”
On the validity of geosocial mobility traces (2013, methodology): “We process the GPS trace to detect “visits” to points of interest (POI), and define a visit as the user staying at one location for longer than some period of time, e.g. 6 minutes.”
Understanding Human Mobility from Twitter (2014, methodology): “dencies To explore whether the observed irregularity in the distribution of dis merely due to GPS resolution, knowledge of the error associated with each reported location is important. Zandbergen in [12] reports median errors of 8, 74 and 600 m associated with the locations obtained from an iPhone ”
Spatial, temporal, and socioeconomic patterns in the use of Twitter and Flickr (2013, background): “For location determined by triangulation in a cellular network, accuracy ranges from 30 to 3000 m, depending on the spatial distribution of cells (Zandbergen 2009).”