1. School of Remote Sensing & Geomatics Engineering, Nanjing University of Information Science & Technology, Nanjing 211800, China
2. School of Geographical Sciences, Nanjing University of Information Science & Technology, Nanjing 211800, China
3. Institute of Earth Surface Dynamics (IDYST), University of Lausanne, 1015 Lausanne, Switzerland
4. Changwang School of Honors, Nanjing University of Information Science & Technology, Nanjing 211800, China