1. Regional Economics Applications Laboratory University of Illinois at Urbana–Champaign Champaign Illinois 61820 United States
2. Department of Landscape Architecture University of Illinois at Urbana–Champaign Champaign Illinois 61820 United States
3. Department of Physical Geography Stockholm University Stockholm 106 91 Sweden
4. College of Environmental Science and Engineering Tongji University Shanghai 266061 PR China
5. Department of Physical Geography Stockholm University Stockholm 106 901 Sweden