1. CyberGIS Center for Advanced Digital and Spatial Studies, University of Illinois at Urbana-Champaign, Urbana, IL, USA
2. CyberInfrastructure and Geospatial Information Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, USA
3. Department of Geography and Geographic Information Science, University of Illinois at Urbana-Champaign, Urbana, IL, USA
4. National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, Urbana, IL, USA