*Xifang Wu¹、Wei Yang²、Chunyang Wang³、Yuki Sofue⁴、Yanjun Shen⁵、Akihiko Kondoh² (1.Graduate School of Science and Engineering , Chiba University、2.Center for Environmental Remote Sensing, Chiba University、3.School of Surveying and Land Information Engineering, Henan Polytechnic University、4.Graduate School of Science, Chiba University、5.Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences)