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《Journal of Geo-Information Science》 2011-02
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Analysis of Field Damage Distribution in Wenchuan Earthquake Based on Fishnet Technology

ZHANG Jun1,2,ZHOU Chenghu2,GUO Zhaocheng2,YANG Panxin3,SUN Xiaoyu2(1.Chinese Academy of Medical Sciences Institute of Medicinal Plant Development,Beijing100193,China;2.State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences andNatural Resources Research,CAS,Beijing100101,China;3.Institute of Earthquake Science,CEA,Beijing100036,China)  
Based on Fishnet technique,by implementing data estimate,data integration and dynamic management to remote sensing images after Wenchuan Earthquake and to basic geographical information for Longmen Shan region,we got a cluster of remote sensing images which can cover the whole Longmen Shan region.Because the distribution of field damages mainly shows in group and in strap,so,slight field damages,although can not be interpreted accurately from a remote sensing image,their summation occupies a considerable area.Therefore,we divided the damages into six density classes on remote sensing images.With Fishnet technique,we resolved some troublesome problems about pick-up of filed damages from remote sensing images,by means of contrasting and analyzing among the number of different time and different data sources remote sensing images.These troublesome problems mainly were pick-up of filed damages in the deep shallows of highly relief mountain region and pick-up the field damages which takes on same characteristics or color in remote sensing image,etc.We finished the remote sensing image interpretability of field damages by artificial visual interpreting comparison and the verified partly results of interpretability in the field.Ultimately,acquired area of field damages is 972.78km2.The distribution of field damages shows apparently the characteristics in subsection parallel to Longmen Shan faults and in zoning perpendicular to Longmen Shan faults.Subsection parallel to Longmen Shan faults: in southwest zone,field damages take on sheet lumped distribution and impact on wider surface area;in the middle zone,distribution of field damages shows bottle-necked shape and range of influence is minor in surface;in the part of east north,field damages take on scattered distribution.Subsection perpendicular to Longmen Shan faults: 80% of field damages distribute in the middle mountain zone,field damages mainly distribute along Wenchuan-Maowen faults and partly river in latter mountain zone.Disasters mainly scatter in two areas,around Mianzhu and Anxian regions and Jiangyou Municipal District in the anterior mountain.
【Fund】: “973”计划(2008CB425701);; 国家自然科学基金重点项目(40830529);; “863”计划项目“基于多源遥感影像的灾害风险快速评估技术”(2009AA12Z101-3)
【CateGory Index】: P694
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