1. Department of Human Geography and Planning, Utrecht University, 3584 CS Utrecht, The Netherlands, and Department of Planning and Geo-information Management, University of Twente, 7514 AE Enschede, The Netherlands
2. Department of Human Geography and Planning, Utrecht University, 3584 CS Utrecht, The Netherlands
3. Department of Planning and Geo-information Management, University of Twente, 7514 AE Enschede, The Netherlands