1. College of Geoscience and Surveying Engineering, China University of Mining & Technology , Beijing, China
2. Key Laboratory of Unmanned Aerial Vehicle Telemetry, Guilin University of Aerospace Technology , Guilin, China
3. State Key Lab of Remote Sensing Science, Faculty of Geographical Science, Jointly Sponsored by Beijing Normal University and Institute of Remote Sensing and Digital Earth of Chinese Academy of Sciences , Beijing, China
4. Finnish Geospatial Research Institute FGI , Masala, Finland
5. Earth System Science Interdisciplinary Center, University of Maryland , College Park, MD, USA