基于合成孔径雷达的城市建筑地震受损分析
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摘要
汶川地震灾区位于青藏高原东缘,该地区云雨天气较多,光学遥感受制约较大,而微波能够穿透云、雾、小雨等,且不受太阳光线的影响,雷达遥感具有全天时、全天候的特点,因而可以弥补光学遥感的不足。根据房屋受地震破坏后影响雷达回波强度,在雷达影像上表现为亮度及纹理不同的原理,本论文利用不同分辨率的COSMO-SkyMed和Radarsat等SAR数据,将其与震前的SPOT影像进行配准后,通过纹理分析等处理,对都江堰市区、北川县城曲山镇等受灾较为严重的城镇进行分析解译,利用雷达影像判读出倒塌房屋的信息,以及地震次生山地灾害对城镇的破坏。
The disaster area of Wenchuan earthquake located in the eastern margin of Tibetan plateau,where cloud and rain were more common,so the optical remote sensing was restricted.The microwave remote sensing could work all time and all-weather for the microwave could penetrate through cloud,fog and light rain,and it also without limitation of night.The buildings which damaged by the earthquake would influence the echo intensity of microwave,which coursed the differences of brightness and texture in the images.The COSMO-SkyMed and Radarsat with different resolution were used in this study.They were geo-corrected with the SPOT images with 2.5 m resolution.By using the edge enhancement and texture analysis,the interpretation was done in the Dujianyan city and Qushan town.The information of damaged buildings was extracted,as well as the information of buildings damaged by the earthquake induced geo-hazards.
The disaster area of Wenchuan earthquake located in the eastern margin of Tibetan plateau,where cloud and rain were more common,so the optical remote sensing was restricted.The microwave remote sensing could work all time and all-weather for the microwave could penetrate through cloud,fog and light rain,and it also without limitation of night.The buildings which damaged by the earthquake would influence the echo intensity of microwave,which coursed the differences of brightness and texture in the images.The COSMO-SkyMed and Radarsat with different resolution were used in this study.They were geo-corrected with the SPOT images with 2.5 m resolution.By using the edge enhancement and texture analysis,the interpretation was done in the Dujianyan city and Qushan town.The information of damaged buildings was extracted,as well as the information of buildings damaged by the earthquake induced geo-hazards.
引文
[1]陈升来,李云茹,李涛.基于合成孔径雷达图像的河流监测方法研究[J].计算机测量与控制,2009,17(7):1267-1269.
[2]赵英时等.遥感应用分析原理与方法[M].北京:科学出版社,2005.
[3]史旭,周扬.汶川地震堰塞湖的雷达遥感识别研究[J].水电能源科学,2009,27(5):65-68.
[4]李德军,赵文杰.基于影像融合技术的合成孔径雷达(SAR)图像目标识别方法的探讨[J].摄像技术,2007(6):40-44.
[5]王根龙,刘红帅,张军慧.汶川特大地震之北川县城震害分析[J].西北地震学报,2010,32(2):173-178.
[6]刘斌涛,陶和平,范建容,等,高分辨率SAR数据在5.12汶川地震灾害监测与评估中的应用[J].山地学报,2008,26(3):267-271.
[2]赵英时等.遥感应用分析原理与方法[M].北京:科学出版社,2005.
[3]史旭,周扬.汶川地震堰塞湖的雷达遥感识别研究[J].水电能源科学,2009,27(5):65-68.
[4]李德军,赵文杰.基于影像融合技术的合成孔径雷达(SAR)图像目标识别方法的探讨[J].摄像技术,2007(6):40-44.
[5]王根龙,刘红帅,张军慧.汶川特大地震之北川县城震害分析[J].西北地震学报,2010,32(2):173-178.
[6]刘斌涛,陶和平,范建容,等,高分辨率SAR数据在5.12汶川地震灾害监测与评估中的应用[J].山地学报,2008,26(3):267-271.
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