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. 2015 Mar 25;14:12. doi: 10.1186/s12942-015-0002-z

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© Feuillet et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Map view of the first two components derived from the principal component analysis and kept as explanatory variables. A. The first component (PC1) refers to the built environment (densely built-up areas and facility density) and is characterized by high values in Paris. B. The second component (PC2) is related to the socio-economic environment (high values indicate well-to-do areas).