1. Ph.D. Student, School of Civil Engineering, Urban Modelling Group, Univ. College Dublin, Belfield, Dublin 4, Ireland.
2. Professor, Center for Urban Science + Progress, New York Univ., 370 Jay St., 12th Floor, Brooklyn, NY 11201 (corresponding author).
3. Associate Professor, School of Computer Science, Univ. College Dublin, Belfield, Dublin 4, Ireland.
4. Formerly, Ph.D. Student, School of Civil Engineering, Urban Modelling Group, Univ. College Dublin, Belfield, Dublin 4, Ireland.
5. Formerly, Research Associate, School of Civil Engineering, Urban Modelling Group, Univ. College Dublin, Belfield, Dublin 4, Ireland.