1. College of GeomaticsXi'an University of Science and Technology Xi'an China
2. water@leeds, School of GeographyUniversity of Leeds Leeds UK
3. State Key Laboratory of Soil Erosion and Dryland Farming on Loess PlateauNorthwest A&F University Yangling China
4. Chinese Academy of Sciences & Ministry of Water ResourcesInstitute of Soil and Water Conservation Yangling China