Measurement of ground displacement from optical satellite image correlation using the free open-source software MicMac
Measurement of ground displacement from optical satellite image correlation using the free open-source software MicMac
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DOI：
10.1016/j.isprsjprs.2014.03.002
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发表时间：
2015-02
影响因子：
12.7
通讯作者：
A. Rosu;M. Pierrot-Deseilligny;A. Delorme;R. Binet;Y. Klinger
中科院分区：
文献类型：
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作者：
A. Rosu;M. Pierrot-Deseilligny;A. Delorme;R. Binet;Y. Klinger
图像相关是确定地震、滑坡、冰流或沙丘迁移引起的地面水平位移的最有效技术之一。分析这些变形可以更好地理解事件的原因和机制。通过对从高分辨率卫星图像获得的事件前和事件后正射图像使用亚像素相关，可以计算具有高平面分辨率的位移场。本文主要研究地震构造事件引起的地面位移测量问题。所使用的三种亚像素相关器是：COSI-Corr -由加州理工学院开发，是一种免费的闭源相关器，依赖于商业软件（ENVI），被地球科学界广泛用于测量地面位移; Medicis -由法国国家空间研究中心开发，也是一种能够测量这种变形的闭源相关器; MicMac -由IGN开发，我们研究和调整用于测量精细地面位移的免费开源相关器。我们测量了水平地面形变使用这三个放大器的SPOT图像在三个研究案例：2001年可可西里地震，2005年在阿法尔凹陷的堤坝入侵和2008年于田地震。
Image correlation is one of the most efficient techniques to determine horizontal ground displacements due to earthquakes, landslides, ice flows or sand dune migrations. Analyzing these deformations allows a better understanding of the causes and mechanisms of the events. By using sub-pixel correlation on before- and after-event ortho-images obtained from high resolution satellite images it is possible to compute the displacement field with high planimetric resolution. In this paper, we focus on measuring the ground displacements due to seismotectonic events. The three sub-pixel correlators used are: COSI-Corr – developed by Caltech, a free, closed-source correlator, dependent on commercial software (ENVI) and widely used by the geoscience community for measuring ground displacement; Medicis – developed by CNES, also a closed-source correlator capable of measuring this type of deformation; and MicMac – developed by IGN, the free open-source correlator we study and tune for measuring fine ground displacements. We measured horizontal ground deformation using these three correlators on SPOT images in three study cases: the 2001 Kokoxili earthquake, the 2005 dyke intrusion in the Afar depression and the 2008 Yutian earthquake.