en fr Is spatial information in ICT data reliable Peut-on se fier à linformation spatiale extraite des données TIC Report as inadecuate




en fr Is spatial information in ICT data reliable Peut-on se fier à linformation spatiale extraite des données TIC - Download this document for free, or read online. Document in PDF available to download.

1 UMR TETIS - Territoires, Environnement, Télédétection et Information Spatiale 2 IFISC - UIB - CSIC - Institute for Cross-Disciplinary Physics and Complex Systems - University of the Balearic Islands - Spanish National Research Council 3 SPhT - Service de Physique Théorique

Abstract : While an increasing number of human activities are studied using data produced by individuals- ICT devices, there have been relatively few contributions investigating the robustness of results against fluctuations of data characteristics. In particular, when ICT data contain spatial information, they represent an invaluable new source for analyzing urban phenomena. Here, we present a stability analysis of higher-level information extracted from mobile phone metadata passively produced during an entire year by 9 million individuals in Senegal. We focus on two specific information-retrieval tasks: a the identification of land use in the region of Dakar by analyzing the temporal rhythms of the communication activity; b the identification of home and work locations of anonymized individuals, allowing for the construction of the Origin-Destination OD matrices for commuting flows. Our analysis reveals that the spatial distributions of land use computed for different samples are remarkably robust, with on average 80% of shared surface area between the different spatial partitions. The OD matrix is less stable with a share of about 70% of commuters in common when considering all types of flows. Better results can be obtained at larger levels of aggregation. These different results confirm that ICT data are mostly a very useful source for the spatial analysis of urban systems, but that their reliability should be tested more thoroughly.

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Keywords : spatial analysis spatial data soil use identification metadata

Mots-clés : ANALYSE SPATIALE DONNEE SPATIALE UTILISATION DU SOL NOUVELLES TECHNOLOGIES DE L-INFORMATION ET DE LA COMMUNICATION METADONNEE STABILISATION





Author: M. Lenormand - T. Louail - M. Barthelemy - J.J. Ramasco -

Source: https://hal.archives-ouvertes.fr/



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