1. CyberGIS Center for Advanced Digital and Spatial Studies, University of Illinois, Urbana, IL, USA
2. CyberInfrastructure and Geospatial Information Laboratory, University of Illinois, Champaign, IL, USA
3. Department of Geography and Geographic Information Science, University of Illinois, Urbana, IL, USA
4. Department of Urban and Regional Planning, University of Illinois, Urbana, IL, USA
5. School of Information Sciences, University of Illinois, Champaign, IL, USA
6. National Center for Supercomputing Applications, University of Illinois, Urbana, IL, USA
7. Social Science Research Institute, Pennsylvania State University, University Park, PA, USA
8. Department of Geosciences, Texas Tech University, Lubbock, TX, USA