1. School of Geography and Information Engineering, China University of Geoscience, Wuhan, PR China
2. National Engineering Research Center of GIS, China University of Geoscience, Wuhan, PR China
3. ChangJiang Waterway Bureau Survey Center, Wuhan, PR China
4. School of Earth and Space Sciences, Institute of Remote Sensing and Geographical Information Systems, Peking University, Beijing, PR China
5. Tencent Technology (Shenzhen) Co., Ltd., Shenzheng, PR China
6. Center for Spatial Information Science, The University of Tokyo, Chiba, Japan