1. Key Laboratory for Satellite Mapping Technology and Applications of State Administration of Surveying, Mapping and Geoinformation of China, Nanjing University, Nanjing, China
2. Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing 210023, China
3. Jiangsu Centre for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing University, Nanjing 210023, China