Mapping inequality in accessibility: a global assessment of travel time to cities in 2015 * Weiss, D.J. 1 , Nelson, A. 2 , Gibson, H.S. 1 , Temperley, W. 3 , Peedell, S. 3 , Lieber, A. 4 , Hancher, M. 4 , Poyart, E. 4 , Belchior, S. 5 , Fullman, N. 6 , Mappin, B. 7 , Dalrymple, U. 1 , Rozier, J. 1 , Lucas, T.C.D. 1 , Howes, R.E. 1 , Tusting, L.S. 1 , Kang, S.Y. 1 , Cameron, E. 1 , Bisanzio, D. 1 , Battle, K.E. 1 , Bhatt, S. 8 , Gething, P.W. 1 * corresponding author 1 Malaria Atlas Project, Big Data Institute, Nuffield Department of Medicine, University of Oxford, Roosevelt Drive, Oxford, OX3 7FY, UK 2 Department of Natural Resources. ITC - Faculty of Geo-Information Science and Earth Observation of the University of Twente, PO Box 217, AE Enschede 7500, The Netherlands 3 European Commission, Joint Research Centre, Unit D.6 Knowledge for Sustainable Development and Food Security, Via Fermi 2749, Ispra 21027, VA, Italy 4 Google Inc., 1600 Amphitheatre Parkway, Mountain View, CA, 94043, USA 5 Vizzuality, Office D Dales Brewery, Gwydir Street, Cambridge CB1 2LJ, UK