1. Geovis Spatial Technology Co.Ltd, Xi’an, China
2. Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, China
3. Xi’an Surveying and Mapping Institute, Xi’an, China
4. College of Geomatics, Xi’an University of Science and Technology, Xi’an, China