Smartphone GPS accuracy study in an urban environment

An iPhone 6 using the Avenza software for capturing horizontal positions was employed to understand relative positional accuracy in an urban environment, during two seasons of the year, two times of day, and two perceived WiFi usage periods. On average, time of year did not seem to influence the average error observed in horizontal positions when GPS-only (no WiFi) capability was enabled, nor when WiFi was enabled. Observations of average horizontal position error only seemed to improve with time of day (afternoon) during the leaf-off season. During each season and during each time of day, horizontal position error seemed to improve in general during perceived high WiFi usage periods (when more people were present). Overall average horizontal position accuracy of the iPhone 6 (7–13 m) is consistent with the general accuracy levels observed of recreation-grade GPS receivers in potential high multi-path environments.

[1]  Paul A. Zandbergen,et al.  Accuracy of iPhone Locations: A Comparison of Assisted GPS, WiFi and Cellular Positioning , 2009 .

[2]  Michael Wallbaum.  A priori error estimates for wireless local area network positioning systems , 2007, Pervasive Mob. Comput..

[3]  Paul A. Zandbergen,et al.  Comparison of WiFi positioning on two mobile devices , 2012, J. Locat. Based Serv..

[4]  Changdon Kee,et al.  Position Accuracy Improvement by Implementing the DGNSS-CP Algorithm in Smartphones , 2016, Sensors.

[5]  Emiliano Miluzzo,et al.  Evaluating the iPhone as a Mobile Platform for Pe ople-Centric Sensing Applications , 2008 .

[6]  Chen Wen,et al.  Initial test on the use of GPS and sensor data of modern smartphones for vehicle tracking in dense high rise environments , 2012, 2012 Ubiquitous Positioning, Indoor Navigation, and Location Based Service (UPINLBS).

[7]  M. Wing,et al.  Consumer-Grade Global Positioning System (GPS) Accuracy and Reliability , 2005 .

[8]  Pete Bettinger,et al.  How a GNSS Receiver Is Held May Affect Static Horizontal Position Accuracy , 2015, PloS one.

[9]  J. C. McGrew,et al.  An Introduction to Statistical Problem Solving in Geography , 1993 .

[10]  Krista L. Merry,et al.  Dynamic accuracy of recreation-grade GPS receivers in oak-hickory forests , 2014 .

[11]  Xiaolu Zhou,et al.  Quantifying multi-dimensional attributes of human activities at various geographic scales based on smartphone tracking , 2018, International Journal of Health Geographics.

[12]  José Ramón Rodríguez-Pérez,et al.  Assessment of Low-Cost GPS Receiver Accuracy and Precision in Forest Environments , 2007 .

[13]  Christine Bauer,et al.  On the (In-)Accuracy of GPS Measures of Smartphones: A Study of Running Tracking Applications , 2013, MoMM '13.

[14]  Michel Bierlaire,et al.  A Probabilistic Map Matching Method for Smartphone GPS data , 2013 .

[15]  Ruzena Bajcsy,et al.  Real-Time Tele-Monitoring of Patients with Chronic Heart-Failure Using a Smartphone: Lessons Learned , 2016, IEEE Transactions on Affective Computing.

[16]  Michael G. Wing,et al.  Performance Comparison of a Low-Cost Mapping Grade Global Positioning Systems (GPS) Receiver and Consumer Grade GPS Receiver under Dense Forest Canopy , 2007, Journal of Forestry.

[17]  Pete Bettinger,et al.  One Year's Experience with a Recreation-Grade GPS Receiver , 2010, Math. Comput. For. Nat. Resour. Sci..

[18]  Stephan Winter,et al.  A fuzzy logic based transport mode detection framework in urban environment , 2018, J. Intell. Transp. Syst..

[19]  Gregory David Lue.  Estimating a Toronto pedestrian route choice model using smartphone GPS data , 2017, Travel Behaviour and Society.

[20]  Pete Bettinger,et al.  Influence of the juxtaposition of trees on consumer-grade GPS position quality , 2012, Math. Comput. For. Nat. Resour. Sci..

[21]  Ehsan Abdi,et al.  Accuracy assessment of GPS and surveying technique in forest road mapping , 2012 .

[22]  Eleni I. Vlahogianni,et al.  Driving analytics using smartphones: Algorithms, comparisons and challenges , 2017 .

[23]  Hisashi Kawai,et al.  Test-retest reliability of daily life gait speed as measured by smartphone global positioning system. , 2018, Gait & posture.

[24]  Narseo Vallina-Rodriguez,et al.  When assistance becomes dependence: characterizing the costs and inefficiencies of A-GPS , 2013, MOCO.

[25]  Gérard Lachapelle,et al.  Evaluation of a Low Cost Hand Held Unit with GNSS Raw Data Capability and Comparison with an Android Smartphone , 2018, Sensors.

[26]  Tiffany C. Veinot,et al.  User acceptance of location-tracking technologies in health research: Implications for study design and data quality , 2018, J. Biomed. Informatics.

[27]  Günther Retscher,et al.  Seamless navigation using GNSS and Wi-Fi/IN with intelligent checkpoints , 2017, J. Locat. Based Serv..

[28]  Clinton W. Epps,et al.  Retained satellite information influences performance of GPS devices in a forested ecosystem , 2015 .

[29]  A. Rudra,et al.  Using smartphones to collect time–activity data for long-term personal-level air pollution exposure assessment , 2016, Journal of Exposure Science and Environmental Epidemiology.

[30]  Julián Tomaštík,et al.  Horizontal accuracy and applicability of smartphone GNSS positioning in forests , 2016 .

[31]  Jeffrey M Casello,et al.  Classification of automobile and transit trips from Smartphone data: Enhancing accuracy using spatial statistics and GIS , 2016 .

[32]  Ryan Garnett,et al.  Comparison of GPS units and mobile Apple GPS capabilities in an urban landscape , 2015 .

[33]  Michael Nowak,et al.  Comparing the GPS capabilities of the Samsung Galaxy S, Motorola Droid X, and the Apple iPhone for vehicle tracking using FreeSim_Mobile , 2011, 2011 14th International IEEE Conference on Intelligent Transportation Systems (ITSC).

[34]  Sean J. Barbeau,et al.  Positional Accuracy of Assisted GPS Data from High-Sensitivity GPS-enabled Mobile Phones , 2011, Journal of Navigation.

[35]  Peter V. August,et al.  Accuracy Assessment of Wetland Boundary Delineation Using Aerial Photography and Digital Orthophotography , 2000 .

[36]  Marko Modsching,et al.  Field trial on GPS Accuracy in a medium size city: The influence of built- up 1 , 2006 .

[37]  Sagi Dalyot,et al.  Towards the Crowdsourcing of Massive Smartphone Assisted-GPS Sensor Ground Observations for the Production of Digital Terrain Models , 2018, Sensors.

[38]  Florian Michahelles,et al.  Accuracy of positioning data on smartphones , 2010, LocWeb '10.