1. Fujian Key Laboratory of Sensing and Computing for Smart Cities, School of Informatics, Xiamen University, Xiamen, China
2. Geospatial Intelligence and Mapping Laboratory, University of Waterloo, Waterloo, ON, Canada
3. Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA
4. Department of Geography and Environmental Management, GeoSTARS Laboratory, University of Waterloo, Waterloo, ON, Canada