1. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing (LIESMARS) and the Hubei Luojia Laboratory, Wuhan University, Wuhan, China
2. School of Electrical and Electronic Engineering, Nanyang Technological University, Jurong West, Singapore
3. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing (LIESMARS), Wuhan University, Wuhan, China
4. Shenyang Geotechnical Investigation and Surveying Research Institute Company Ltd., Shenyang, China