[Zhu, Xinyan; Hu, Tao] Wuhan Univ, State Key Lab Informat Engn Surveying Mapping & R, Wuhan 430079, Hubei, Peoples R China.
[Zhang, Hao] CCNU, Natl Engn Res Ctr E Learning, Wuhan 430072, Hubei, Peoples R China.
[Zhu, Xinyan; Hu, Tao] Wuhan Univ, Collaborat Innovat Ctr Geospatial Technol, Wuhan 430079, Hubei, Peoples R China.
[Hu, Tao; Clunis, Julaine] Kent State Univ, Sch Informat, Kent, OH 44240 USA.
[Yang, Gelan] Hunan City Univ, Dept Informat Sci & Engn, Yiyang 413000, Peoples R China.