Optimizing DEM error mitigation in multi-temporal InSAR: A detection-and-estimation strategy based on phase gradient direction consistency

IF 11.4 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Xinyou Song , Lei Zhang , Zhong Lu , Hongyu Liang , Weijia Ren
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引用次数: 0

Abstract

Accurate topographic phase removal in Differential InSAR (DInSAR) processing relies on Digital Elevation Models (DEMs), yet limitations in DEM accuracy and currency hinder precise surface displacement measurement. Although modern SAR satellites feature a relatively narrow orbit tube, the phases induced by DEM errors cannot be safely ignored especially in areas under rapid urbanization. Current Multi-Temporal InSAR (MT-InSAR) methods, which estimate DEM errors alongside deformation, suffer from potential biases due to inaccurate deformation models and high computational cost from per-point processing. We present here a novel detection-and-estimation strategy for efficient DEM error mitigation. Our key innovation is a phase gradient direction consistency (GDC) criterion, which provides a direct and intuitive visualization of pixels affected by DEM errors (PEEs)—a capability not previously available. This is a significant advancement as it allows targeted correction instead of exhaustive estimation. We further develop a generalizable framework for DEM error retrieval applicable to various scenarios. Validation with simulated and real-world data from urban and mountainous environments demonstrates effective separation of DEM errors from various spatiotemporal deformation signals. In addition, the proposed method achieves an order-of-magnitude improvement in processing efficiency compared to conventional approaches. By directly identifying and estimating DEM errors from wrapped phases, our approach streamlines deformation retrieval and is readily integrated into existing MT-InSAR workflows.
多时相InSAR DEM误差缓解优化:基于相位梯度方向一致性的检测与估计策略
差分InSAR (DInSAR)处理中精确的地形相位去除依赖于数字高程模型(DEM),但DEM精度和流通的限制阻碍了精确的地表位移测量。尽管现代SAR卫星的轨道管相对较窄,但在城市化快速发展的地区,DEM误差引起的相位不容忽视。当前的Multi-Temporal InSAR (MT-InSAR)方法估计DEM误差和变形,由于变形模型不准确和每点处理的计算成本高,存在潜在的偏差。本文提出了一种有效降低DEM误差的新型检测和估计策略。我们的关键创新是相位梯度方向一致性(GDC)标准,它提供了受DEM误差(pee)影响的像素的直接和直观的可视化-这是以前无法实现的功能。这是一个重大的进步,因为它允许有针对性的校正,而不是详尽的估计。我们进一步开发了一个适用于各种场景的DEM错误检索的通用框架。通过城市和山区环境的模拟和真实数据验证,可以有效地将DEM误差与各种时空变形信号分离。此外,与传统方法相比,该方法在处理效率上实现了数量级的提高。通过直接识别和估计包裹阶段的DEM误差,我们的方法简化了变形检索,并很容易集成到现有的MT-InSAR工作流程中。
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来源期刊
Remote Sensing of Environment
Remote Sensing of Environment 环境科学-成像科学与照相技术
CiteScore
25.10
自引率
8.90%
发文量
455
审稿时长
53 days
期刊介绍: Remote Sensing of Environment (RSE) serves the Earth observation community by disseminating results on the theory, science, applications, and technology that contribute to advancing the field of remote sensing. With a thoroughly interdisciplinary approach, RSE encompasses terrestrial, oceanic, and atmospheric sensing. The journal emphasizes biophysical and quantitative approaches to remote sensing at local to global scales, covering a diverse range of applications and techniques. RSE serves as a vital platform for the exchange of knowledge and advancements in the dynamic field of remote sensing.
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