1. School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geo-simulation, Sun Yat-sen University, Guangzhou, China
2. School of Geographic Sciences, Key Lab. of Geographic Information Science (Ministry of Education), East China Normal University, Shanghai, P.R. China
3. School of Information Engineering, China University of Geosciences, Wuhan, China
4. Department of Data Technology and Products, Alibaba Group, Hangzhou, China
5. Department of Civil, Environmental and Geomatic Engineering, ETH Zurich, Zürich, Switzerland