顾及相干系数的InSAR形变场采样算法  

Deformation Field Sampling Algorithm Considering InSAR Coherence Coefficient

作　　者：孙凯 孟国杰[1] 洪顺英[1] 董彦芳[1] 李成龙 SUN Kai;MENG Guojie;HONG Shunying;DONG Yanfang;LI Chenglong(Key Laboratory of Earthquake Forecast, Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China;State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China)

机构地区：[1]中国地震局地震预测研究所地震预测重点实验室,北京100036 [2]中国地震局地质研究所地震动力学国家重点实验室,北京100029

出　　处：《遥感信息》2020年第5期106-112,共7页Remote Sensing Information

基　　金：国家自然科学基金项目(41874024、41604007);国家国际科技合作项目(2015DFR21100);国家重点研发计划项目(2017YFB0502700);中国地震局地震预测研究所基本科研业务费专项重点课题(2018IEF010103);中国地震局地震预测研究所基本科研业务费专项(2019IEF0702)。

摘　　要：利用SAR差分干涉测量技术获取的大范围连续覆盖地表形变场为断层活动性质、发震断层参数等反演研究提供了丰富的数据信息。为提高形变机制反演数据源的可靠性和结果的准确性,提出一种顾及InSAR相干系数的概率采样算法。该算法基于四叉树数据压缩模型,将窗口形变梯度以及自适应核运算后的相干表征量按权重分配作为分割窗口的约束参数,以此建立概率采样函数;并引入数字高程模型对无效采样信息进行掩膜处理,达到兼顾提高采样点质量和保留细节形变信息的目的。通过对2016年中国台湾地区美浓Mw 6.7级地震同震形变场数据进行实验分析,结果表明,顾及相干系数的概率采样算法在保留高质量数据和重要细节信息方面优势更为明显。The large-scale and continuous coverage of the surface deformation fields obtained by SAR differential interferometry provides abundant data information for inversion studies in fault activity and seismogenic fault parameters.In order to improve the reliability of the data source and the accuracy of the results,this thesis proposes a probability sampling algorithm that takes the InSAR coherence coefficient into account.Based on the quadtree data compression model,calculate the deformation gradient and the coherent representation by adaptive kernel operation of the image window,assign them weights as the constraint parameters of the segmentation window to establish the probability sampling function,and introduce the digital elevation model to mask the invalid sampling information to achieve the goal of improving the quality of the sampling points and retaining the detailed deformation simultaneously.This paper analyzes the data of Mw 6.7 co-seismic deformation field in Mino,Taiwan province of China in 2016.The results show that the probability sampling algorithm considering the coherence coefficient has more obvious advantages in retaining high quality data and important details.

关 键 词：相干系数 四叉树采样 概率采样 INSAR 掩膜 

分 类 号：P228[天文地球—大地测量学与测量工程]