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The Impact of Biases in the Crowdsourced Trajectories on the Output of Data Mining Processes

Basiri, A; Haklay, M; Gardner, Z; (2018) The Impact of Biases in the Crowdsourced Trajectories on the Output of Data Mining Processes. In: Proceedings of VGI-ALIVE - AnaLysis, Integration, Vision, Engagement. Association of Geographic Information Laboratories in Europe (AGILE): Lund, Sweden. Green open access

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Abstract

The emergence of the Geoweb has provided an unprecedented capacity for generating and sharing digital content by professional and non- professional participants in the form of crowdsourcing projects, such as OpenStreetMap (OSM) or Wikimapia. Despite the success of such projects, the impacts of the inherent biases within the ‘crowd’ and/or the ‘crowdsourced’ data it produces are not well explored. In this paper we examine the impact of biased trajectory data on the output of spatio-temporal data mining process. To do so, an experiment was conducted. The biases are intentionally added to the input data; i.e. the input trajectories were divided into two sets of training and control datasets but not randomly (as opposed to the data mining procedures). They are divided by time of day and week, weather conditions, contributors’ gender and spatial and temporal density of trajectory in 1km grids. The accuracy of the predictive models are then measured (both for training and control data) and biases gradually moderated to see how the accuracy of the very same model is changing with respect to the biased input data. We show that the same data mining technique yields different results in terms of the nature of the clusters and identified attributes.

Type: Proceedings paper
Title: The Impact of Biases in the Crowdsourced Trajectories on the Output of Data Mining Processes
Event: 21th AGILE International Conference on Geographic Information Science
Location: Lund, Sweden
Dates: 12 June 2018 - 15 June 2018
Open access status: An open access version is available from UCL Discovery
Publisher version: http://www.cs.nuim.ie/~pmooney/
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Centre for Advanced Spatial Analysis
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography
URI: https://discovery.ucl.ac.uk/id/eprint/10052658
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