1. Department of Geography and GIScience, University of Illinois at Urbana-Champaign, Urbana, USA
2. School of Cultural and Creative Studies, Aoyama Gakuin University, Shibuya, Japan
3. Center for Spatial Information Science, University of Tokyo, Kashiwa, Japan
4. Department of Geography and Resource Management, The Chinese University of Hong Kong, Shatin, Hong Kong
5. Department of Human Geography and Spatial Planning, Utrecht University, Utrecht, The Netherlands