1. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, People’s Republic of China
2. SiChuan Communication Surveying & Design Institute CO., Ltd, Chengdu, People’s Republic of China
3. Guangzhou Urban Planning and Design Survey Research Institute, Guangzhou, People’s Republic of China
4. Guangdong Enterprise Key Laboratory for Urban Sensing, Monitoring and Early Warning, Guangzhou, People’s Republic of China