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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Urban Damage Level Mapping Based on Scattering Mechanism Investigation Using Fully Polarimetric SAR Data for the 3.11 East Japan Earthquake
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Urban Damage Level Mapping Based on Scattering Mechanism Investigation Using Fully Polarimetric SAR Data for the 3.11 East Japan Earthquake

机译：基于3.11东日本地震全极化SAR数据的散射机制调查的城市破坏程度制图

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摘要

A quick response to a large-scale natural disaster such as earthquake and tsunami is vital to mitigate further loss. Remote sensing, especially the spaceborne sensors, provides the possibility to monitor a very large scale area in a short time and with regular revisit circle. Damage ranges and damage levels of the destructed urban areas are extremely important information for rescue planning after an event. Rapid mapping of the urban damage levels with synthetic aperture radar (SAR) is still challenging. Compared with single-polarization SAR, fully polarimetric SAR (PolSAR) has a better potential to understand the urban damage from the viewpoint of scattering mechanism investigation. In radar polarimetry, the dominant double-bounce scattering mechanism in an urban area is primarily induced by the ground-wall structures and can reflect the changes of these structures. In this sense, urban damage level in terms of destroyed ground-wall structures can be indicated by the reduction of the dominant double-bounce scattering mechanism, which is the basis of this study. This work first establishes and validates the linear relationship between the urban damage level and the proposed polarimetric damage index using polarimetric model-based decomposition. Then, efforts are focused on the development of a rapid urban damage level mapping technique which mainly includes two steps of urban area extraction and polarimetric damage level estimation. The 3.11 East Japan earthquake and tsunami inducing great-scale destruction are adopted for study using L-band multitemporal spaceborne PolSAR data. Experimental studies demonstrate that the estimated damage levels are closely consistent to the ground-truth. The final urban damage level map for the full scene is generated thereafter. Results achieved in this study further validate the necessity of exploring fully polarimetric technique for damage assessment.
机译：对诸如地震和海啸等大规模自然灾害的快速反应对于减轻进一步的损失至关重要。遥感，尤其是星载传感器，使人们有可能在短时间内以定期的重访周期监视非常大的区域。灾后市区的破坏范围和破坏水平对于事件发生后的救援计划至关重要。用合成孔径雷达（SAR）快速绘制城市破坏程度的地图仍然很困难。与单极化SAR相比，从散射机理研究的角度来看，全极化SAR（PolSAR）具有更好的了解城市破坏的潜力。在雷达极化法中，城市地区主要的双反弹散射机制主要是由地壁结构引起的，并且可以反映这些结构的变化。从这个意义上讲，可以通过减少主导的双跳散射机制来表明城市被破坏的地下墙结构的破坏程度，这是本研究的基础。这项工作首先使用基于极化模型的分解建立并验证了城市破坏水平与拟议极化破坏指数之间的线性关系。然后，着重于发展快速的城市破坏程度制图技术，该技术主要包括市区提取和极化破坏程度估计两步。采用L波段多时相星载PolSAR数据研究了3.11日东日本地震和海啸引起的大规模破坏。实验研究表明，估计的破坏程度与地面真相非常一致。此后，将生成整个场景的最终城市破坏程度图。这项研究中取得的结果进一步证实了探索完全极化技术进行损害评估的必要性。

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