文献类型：会议论文

英文题名：DYNAMIC CHANGE MONITORING AND ASSESSMENT FOR SANDY LAND BASED ON QUANTITATIVE REMOTE SENSING

作者：Wu, Junjun[1] Gao, Zhihai[2] Liu, Qinhuo[1] Li, Zengyuan[2] Zhong, Bo[1] Sun, Bin[2] Ding, Xiangyuan[3] Li, Changlong[4] Wang, Hongyan[1] Yang, Aixia[1] Wang, Xinshuang[5]

第一作者：Wu, Junjun

通信作者：Sun, B[1]

机构：[1]Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China;[2]Chinese Acad Forestry, Inst Forest Resource Informat Tech, Beijing 100091, Peoples R China;[3]Insights Value Beijing, Beijing 100029, Peoples R China;[4]State Acad Forestry Adm, Beijing 102600, Peoples R China;[5]Shaanxi Geomat Ctr Natl Adm Surverying Mapping &, Xian 710054, Shaanxi, Peoples R China

会议论文集：38th IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

会议日期：JUL 22-27, 2018

会议地点：Valencia, SPAIN

语种：英文

外文关键词：sandy land detection; dynamic change monitoring and assessment; mixed pixel decomposition; vegetation coverage

年份：2018

摘要：Because of climatic change and human activities, sandification is becoming a serious threat to the sustainability of human habitation. The aim of this study, therefore, was to propose a method for sandy land detection based on mixed pixel decomposition; the dynamic change monitoring and assessment was then conducted. Results showed that the pixel purity index is a viable indicator for endmember extraction for sandy land detection via remote sensing by linear mixed pixel decomposition methods. Results showed that when the endmember proportion of sandy land accounted for >50% of the total (except for the vegetation), a pixel would be detected as sandy land. The extraction accuracy was verified to be 86.42% by field data. Early-middle August was believed to be the most reasonable time to assess sandy land coverage based on vegetation coverage. The sandy land areas in 2005 and 2014 were 5524 km 2 and 4109 km 2 respectively, reduced by 25.6%. Under the governance of sandy land in the last ten years, the sandy land area declined continually, but some areas were still degraded to a worse status and need special care to protect.