Land degradation mapping based on hyperion data in desertification region of northwest China

摘要：

Desertification is an alarming sign of land degradation in Henshan county of northwest china.Due to the considerable costs of detailed ground surveys of this phenomenon,remote sensing is an appropriate alternative for analyzing and evaluating the risks of the expansion of land degradation.Degradation features can be detected directly or indirectly by using image data.In this paper,based on the Hyperion images of Hengshan desertification region of northwest china,a new algorithm aimed at land degradation mapping,called Land Degradation Index (LDI),was put forward.This new algorithm is based on the classified process.We applied the linear spectral unmixing algorithm with the training samples derived from the formerly classified process so as to find out new endmembers in the RMS error imagine.After that,using neutral net mapping with new training samples,the classified result was gained.In addition,after applying mask processing,the soils were grouped to 3 types (Kappa =0.90):highly degraded soils,moderately degraded soils and slightly degraded soils.By analyzing 3 mapping methods:mixture-classification,the spectral angle mapper and mixturetuned matched filtering,the results suggest that the mixture-classification has the higher accuracy (Kappa=0.7075) than the spectral angle mapper (Kappa=0.5418) and the mixture-tuned matched filter (Kappa=0.6039).As a result,the mixture-classification is selected to carry out Land Degradation Index analysis.

关键词： Land degradation index Mixture-classification Spectral angle mapper Mixture-tuned matched filtering Endmember

作者: CHENG Penggen WU Jian OUYANG Ping HE Ting

作者单位: Faculty of Geosciences & Geomatics,East China Institute of Technology,Fuzhou 344000 China;College of School of Resourced and Environment Science,Wuhan University,Wuhan 430079 China Department of Water Conservancy,Nanchang Institute of Technology,Nanchang 330099 China Key Laboratory of Land Use,Ministry of Land and Resources,Beijing 100035 China

会议类型: 国际会议

会议名称: 第16届国际地理信息科学与技术大会(16th International Conference on GeoInformatics and the Joint Conference)

会议地点: 广州

会议语种:英文

在线出版日期: 2008-06-28（万方平台首次上网日期，不代表论文的发表时间）