1. School of Civil and Architectural Engineering; Shandong University of Technology; Zibo 255000 P. R. China
2. Key Laboratory of Geographic Information Science (Ministry of Education); East China Normal University; Shanghai 200241 P. R. China
3. Key Laboratory for National Geographic Census and Monitoring; National Administration of Surveying, Mapping and Geoinformation; Wuhan 433079 P. R. China
4. Key Laboratory for Digital Land and Resources of Jiangxi Province; East China University of Technology; Nanchang 330013 P. R. China
5. Hubei Key Laboratory of Regional Development and Environmental Response (Hubei University); Wuhan 430062 P. R. China
6. Institute of Remote Sensing and Digital Earth; Chinese Academy of Sciences; Beijing 100101 P. R. China
7. Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden; Chinese Academy of Sciences; Menglun 666303 P. R. China