[1] Xian Univ Sci & Technol, Coll Geol & Environm, Xian 710054, Peoples R China
[2] Chinese Acad Sci, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
[3] Minist Water Resourres, Yangling 712100, Shaanxi, Peoples R China
[4] Henan Polytech Univ, Coll Geomat & Land Informat Engn, Jiaozuo 454000, Henan, Peoples R China
[5] Xian Univ Sci & Technol, Coll Geomat, 58 Yanta Rd, Xian 710054, Peoples R China