摘要
选取汶川地震中北川县经历强烈震动的湔江流域的一部分作为研究区,在ENVI平台下,基于最大似然法与SPOT 5影像开展地震滑坡信息自动提取研究工作。为研究阈值选取对结果的影响,分别选取阈值为0、0.05、0.1、0.2、0.3、0.4、0.5、0.6、0.7、0.8、0.9共11种情况开展研究。将提取结果与基于高分辨航片与人工目视解译得到的详细滑坡编录图进行定量对比。结果表明阈值为0.05的地震滑坡信息自动提取结果最好,正确率达到35.52%。
In this paper,automatic extraction of earthquake-triggered landslides was carried out based on ENVI platform,the maximum likelihood method,SPOT 5 images in a part of the Jian River watershed experienced strong shaking during the 2008 Wenchuan earthquake of China. Eleven thresholds,including 0,0. 05,0. 1,0. 2,0. 3,0. 4,0. 5,0. 6,0. 7,0. 8,and 0. 9 were considered respectively for constructing earthquake-triggered landslide maps and analyzing threshold effects. These result landslide maps based on automatic extraction method were quantitatively compared with landslide inventory constructed by visual interpretation of aerial photos in high resolutions. The result shows that the threshold value of 0. 05 can generate the best result,which show success rate of 35. 52%.
出处
《中国地质灾害与防治学报》
CSCD
2013年第3期19-25,共7页
The Chinese Journal of Geological Hazard and Control
基金
国家自然科学基金项目(41202235)
中国地震局地质研究所基本科研业务专项资助(IGCEA1215)
关键词
2008年汶川地震
滑坡
最大似然法
自动提取
目视解译
the 2008 Wenchuan earthquake
landslide
maximum likelihood
automatic extraction
visual interpretation
