[Wan, Qiao; Duan, Xiaoqi; Tian, Youliang] Guizhou Univ, Coll Comp Sci & Technol, Guiyang, Peoples R China.
[Zhang, Tong] Wuhan Univ, State Key Lab Informat Engn Surveying Mapping & Re, Wuhan, Peoples R China.
[Xu, Zhibang] Chinese Acad Sci, Inst Urban Environm, Xiamen, Peoples R China.
[Yan, Jinbiao] Hengyang Normal Univ, Coll Geog & Tourism, Hengyang, Peoples R China.
[Wang, Wangshu] TUWien, Dept Geodesy & Geoinformat, Vienna, Austria.