极化SAR建筑物震害信息识别研究方法综述

A Summary of Research Methods for Seismic Damage Information Recognition of Polarized SAR Buildings

合成孔径雷达具有全天候、全天时的对地观测优势,全极化合成孔径雷达(PolSAR)能够同时获取4种极化信息,利用PolSAR在震后进行震害评估具有及时性和准确性的优势。首先概述了PolSAR的发展状况及其在建筑物震害信息提取中的应用;其次,基于不同数据类型(多时相数据、多源数据、单时相数据),概述了近10 a来PolSAR数据在建筑物震害提取中的应用及其对比分析;然后,从极化分解方法、极化特征以及纹理特征3个方面对PolSAR数据的建筑物震害提取方法进行了详细阐述;最后,提出未来研究工作的设想,以期结合地理信息数据POI补充PolSAR在震害评估精度方面的不足。

Synthetic Aperture Radar(SAR)can observe the Earth without the influence of the weather and sunlight,and Polarimetric SAR(PolSAR)even could acquire four kinds of polarization information at the same time. Therefore,extracting post-earthquake damage information by use of PolSAR has the advantage of timeliness and accuracy. This paper shows a summary of the methods for extracting seismic damage information based on PolSAR data. It firstly review the development of PolSAR and then summarizes the application and comparative analysis of the data types(multi-source data,multi-temporal data and single-temporal data)for extracting seismic damage of buildings in the past 10 years. Next,the methods of building earthquake damage extraction based on polarization decomposition and polarization characteristics and texture features is summarized. Finally,the research work is proposed to supplement the deficiency of PolSAR in earthquake damage extraction accuracy with the combination of geographic information data POI.