[Nie, Zhihong] Cent S Univ, Sch Civil Engn, Changsha 410076, Hunan, Peoples R China.
[Yang, Xiaoxia] Chengdu Univ Technol, Coll Earth Sci, Changsha 610059, Hunan, Peoples R China.
[Yang, Xiaoxia] Minist Land & Resources PR China, Key Lab Geosci Spatial Informat Technol, Changsha 610059, Hunan, Peoples R China.
[Du, Ronghua; Li, Sumin; Hou, Zhixiang] Changsha Univ Sci & Technol, Sch Vehicle & Mech Engn, Changsha 610059, Hunan, Peoples R China.