相干变化指数法在震害快速评估中的应用
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摘要
合成孔径雷达(SAR)具有全天候全天时的特点,为快速展开地震救援,评估震害损失提供了重要的数据支持。本文基于汶川震中东南平原地区的ENVISATASAR影像,利用相位干涉方法处理得到相干变化指数图像,对6个评估区域的像元相干变化指数进行统计分析,以相干变化指数平均值作为区分建筑物基本完好与损毁的阈值,并与实地调查结果相比,精度基本达到70%。验证干涉相干变化指数法对震害快速评估有效的同时,也为震区提供震害救援的依据。
The synthetic aperture radar( SAR) has the characteristics of all- weather and all- time,which can provides important data support for the earthquake relief immediately and assessment of the seismic disaster. Based on the ENVISAT ASAR images of the plains in southeastern Wenchuan- epicenter,this paper employs the coherence images which are obtained by interferometric processing with phase information to get coherence change index image. Based on coherence change index of image element analysis about six assessment areas,we got the average of coherence change index as the threshold value to differentiate between intact and damage of buildings. Compared with the result of filed survey,the accuracy of the method that is used in the paper achieved about 70%. The study verified value of coherence change index method for rapid earthquake loss estimation,and it provided great assistance to earthquake disaster relief.
The synthetic aperture radar( SAR) has the characteristics of all- weather and all- time,which can provides important data support for the earthquake relief immediately and assessment of the seismic disaster. Based on the ENVISAT ASAR images of the plains in southeastern Wenchuan- epicenter,this paper employs the coherence images which are obtained by interferometric processing with phase information to get coherence change index image. Based on coherence change index of image element analysis about six assessment areas,we got the average of coherence change index as the threshold value to differentiate between intact and damage of buildings. Compared with the result of filed survey,the accuracy of the method that is used in the paper achieved about 70%. The study verified value of coherence change index method for rapid earthquake loss estimation,and it provided great assistance to earthquake disaster relief.
引文
[1]马国锐,陈峰.多源遥感影像变化检测方法在地震城区灾害评估中的比较[J].海洋测绘,2011,31(6):72-75
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[7]王晓青,魏成阶,苗崇刚,等.震害遥感快速提取研究——以2003年2月24日新疆巴楚-伽师6.8级地震为例[J].地学前缘,2003,10(8):285-291.
[8]邵芸,宫华泽,王世昂,等.多源雷达遥感数据汶川地震灾情应急监测与评价[J].遥感学报,2008,12(6):865-870.
[9]李宏男,肖诗云,霍林生.汶川地震震害调查与启示[J].建筑结构学报,2008(4):10-19.
[10]Hanssen R F.Radar Interferometry-Data Interpretation and Error Analysis[M].Dordrecht:Kluwer Academic,2001.
[11]Lee Hand Liu JG.AnalysisoftopographicdecorrelationinSARinterferometryusingratiocoherenceimagery[J].IEEE T ransactions on Geoscience and Remote Sensing,2001(39):223-232.
[12]何敏,何秀凤.利用In SAR相干系数探测地震引起的城市破坏程度[J].高技术通讯,2008(4):414-417.
[13]李萍.基于遥感技术的2003年2月24日新疆巴楚地震震害快速评估[D].哈尔滨:中国地震局工程力学研究所,2004.
[14]赵福军.遥感影像震害信息提取技术研究[D].哈尔滨:中国地震局工程力学研究所,2010.
[2]刘云华,屈春燕,单新建,等.SAR遥感图像在汶川地震灾害识别中的应用[J].地震学报,2010(2):214-223,256.
[3]Ohkura H,Jitsufuchi T,Matsumoto T,et al.Application of SAR Data to Monitoring of Earthquake Disaster[J].Advances in Space Research,1997,19(9):1 429-1 436.
[4]Gamba P,Dell'Acqua F,Trianni G.Rapid Damage Detection in the Barn Area Using Multitemporal SAR and Exploiting Anciliary Data[J].IEEE Transactions on Geoscience and Remote Sensing,2007,45(6):1 582-1 589.
[5]杨喆,任德风.利用机载SAR震害影像特征快速圈定极震区[J].地震地质,1999,21(4):452-458.
[6]张景发,谢礼立,陶夏新.建筑物震害遥感图像的变化检测与震害评估[J].自然灾害学报,2002,11(2):59-64.
[7]王晓青,魏成阶,苗崇刚,等.震害遥感快速提取研究——以2003年2月24日新疆巴楚-伽师6.8级地震为例[J].地学前缘,2003,10(8):285-291.
[8]邵芸,宫华泽,王世昂,等.多源雷达遥感数据汶川地震灾情应急监测与评价[J].遥感学报,2008,12(6):865-870.
[9]李宏男,肖诗云,霍林生.汶川地震震害调查与启示[J].建筑结构学报,2008(4):10-19.
[10]Hanssen R F.Radar Interferometry-Data Interpretation and Error Analysis[M].Dordrecht:Kluwer Academic,2001.
[11]Lee Hand Liu JG.AnalysisoftopographicdecorrelationinSARinterferometryusingratiocoherenceimagery[J].IEEE T ransactions on Geoscience and Remote Sensing,2001(39):223-232.
[12]何敏,何秀凤.利用In SAR相干系数探测地震引起的城市破坏程度[J].高技术通讯,2008(4):414-417.
[13]李萍.基于遥感技术的2003年2月24日新疆巴楚地震震害快速评估[D].哈尔滨:中国地震局工程力学研究所,2004.
[14]赵福军.遥感影像震害信息提取技术研究[D].哈尔滨:中国地震局工程力学研究所,2010.