[1] State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing,100875, China
[2] National Geomatics Center of China, Beijing,100830, China
[3] Institute of Agricultural Information and Economics, Beijing Academy of Agricultural and Forestry Sciences, Beijing,100097, China
[4] Natural Resource Assets Statistics and Accounting Centre of Ningxia Hui Autonomous Region, Yinchuan,750002, China