1. Department of Geographic Information Science, School of Geography and Ocean ScienceNanjing University Nanjing China
2. Jiangsu Provincial Key Laboratory of Geographic Information Science and TechnologyNanjing University Nanjing China
3. Key Laboratory for Satellite Mapping Technology and Applications of State Administration of Surveying, Mapping and Geoinformation of ChinaNanjing University Nanjing China
4. Chongqing Institute of Surveying and Monitoring for planning and natural resources Chongqing China
5. Collaborative Innovation Center of Novel Software Technology and Industrialization Nanjing China
6. University Corporation for Polar Research Beijing China