1. School of Sensing and Geomatics Engineering, Nanjing University of Information Science and Technology, Nanjing, China
2. School of Remote Sensing and Geomatics Engineering, Nanjing University of Information Science and Technology, Nanjing, China
3. Department of Geodesy and Geospatial Engineering, Institute of Civil and Environmental Engineering, University of Luxembourg, Esch-sur-Alzette, Luxembourg