Institute for Geospatial Research and Education, Eastern Michigan University, Ypsilanti, Michigan 48197, USA;
Guangzhou Institute of Geography, Guangzhou 510070, China;
Department of Computer Science, Indiana University, Bloomington, Indiana 47405, USA;
Department of Computer Science, New York University, NY 10012, USA;
Institute for Geospatial Research and Education, Eastern Michigan University, Ypsilanti, Michigan 48197, USA;
Center for Advanced Spatial Analysis, University College London, London WC1E 6BT, UK;
Institute for Geospatial Research and Education, Eastern Michigan University, Ypsilanti, Michigan 48197, USA;