1. College of Big Data and Internet, Shenzhen Technology University, Shenzhen, China
2. Key Laboratory of National Geographic Census and Monitoring, Ministry of Natural Resources, Wuhan University, Wuhan, China
3. School of Architecture and Urban Planning & Guangdong Key Laboratory of Urban Informatics, Shenzhen University, Shenzhen, China
4. Department of Land Surveying and Geo-Informatics & Smart Cities Research Institute, The Hong Kong Polytechnic University, Hong Kong, China
5. State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing, Wuhan University, Wuhan, China