基于PSInSAR方法和ASAR数据监测天津地面沉降的试验研究
A PRELIMINARY STUDY OF THE SUBSIDENCE IN TIANJIN AREA USING ASAR IMAGES BASED ON PSInSAR TECHNIQUE
查看参考文献14篇
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文摘
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概述了PSInSAR方法的技术流程,阐述了定标ENVISAT ASAR数据对PS候选点(Persistent Scatterer Cadidate,PSC)筛选的作用.研究表明:对ENVISAR ASAR 数据进行定标有助于筛选出更多的PS候选点;以定标得到的后向散射系数作为阈值,可以剔除散射信号统计特性较稳定但散射强度低的像素点,从而避免可能由这些点引入的相位误差.在初步实现PSInSAR方法的基础上,运用14景ENVISAT ASAR数据获得了天津地区的年均线性沉降速率,揭示的天津市地面沉降趋势与前人研究结果较为一致,获得的形变速率值准确性尚待数据量的增多而进一步提高. |
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其他语种文摘
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By identifying temporarily stable natural reflectors or persistent scatterers(PS),the PSInSAR(Persistent Scatterers for SAR Interferometry) technique can analyze the subset of pixels in SAR images,even with long temporal and space baselines,so as to achieve high accuracy deformation measurement.The authors adopted the PSInSAR process briefly summarized in this paper and applied this method in Tianjin area to detect the deformation phenomena by using ENVISAT ASAR images.Calibration of ASAR images can help us select more PSCs.Using calibrated backscattering coefficient threshold,we can discard the pixels whose amplitudes are relatively stable and whose backscattered signals are weak and incoherent.The results obtained by processing 14 images show the distribution and the relative deformation value of the displacement field.The estimated linear velocities of PS are not accurate enough because of the relatively small number of images. |
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来源
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国土资源遥感
,2007(4):23-27 【核心库】
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关键词
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PSInSAR
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地面沉降
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定标
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ASAR
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地址
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1.
中国科学院遥感应用研究所, 遥感科学国家重点实验室, 北京, 100101
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（北京）中国地质大学(北京)地球物理与信息技术学院, 北京, 100083
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中国国土资源航空物探遥感中心, 北京, 100083
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-070X |
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学科
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地质学;自动化技术、计算机技术 |
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基金
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国土资源部中国地质调查局项目
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文献收藏号
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CSCD:3012559
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