1. School of Architecture and Information Engineering, Shandong Vocational College of Industry, Zibo 256414, China
2. School of Civil Engineering and Geomatics, Shandong University of Technology, Zibo 255000, China
3. Key Laboratory of National Geographic Census and Monitoring, Ministry of Natural Resources, Wuhan 430072, China
4. Key Laboratory of Agricultural Remote Sensing, Ministry of Agriculture and Rural Affairs/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
5. Research Institute of Aerospace Information, Chinese Academy of Sciences, Beijing 100101, China
6. Langfang Research and Development Center for Spatial Information Technology, Langfang 065000, China