Characterizing sudden geo-hazards in mountainous areas by D-InSAR with an enhancement of topographic error correction
Characterizing sudden geo-hazards in mountainous areas by D-InSAR with an enhancement of topographic error correction
复制标题
增强地形误差修正的D-InSAR表征山区突发地质灾害
DOI：
10.1007/s11069-014-1431-x
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发表时间：
2015-02
期刊：
影响因子：
3.7
通讯作者：
Zhu J. J.
中科院分区：
文献类型：
--
作者：
Sun Q.;Zhang L.;Hu J.;Ding X. L.;Li Z. W.;Zhu J. J.
差分干涉合成孔径雷达（D-InSAR）被认为是监测山区突发地质灾害（例如地震和山体滑坡）的一种有前途的技术。然而，恶劣的自然环境（例如陡坡和植被）使D-InSAR技术面临许多挑战。其中，由于地形高度不准确而引起的相位残差可能导致无法容忍的误差，这一点尚未引起足够的重视。我们在本文中提出了一种使用 D-InSAR 测量来表征突发地质灾害的新策略，重点是地形误差的校正。在所提出的策略中，构建了带有离群值检测器的最小二乘模型来估计多基线包裹差分干涉图的形貌误差，并且不需要容易出错的相位展开过程。新策略应用于为监测中国舟曲县发生的特大泥石流而获取的 ALOS PALSAR 图像。在对最初从不准确的 ASTER GDEM 中得到的地形高度进行细化后，可以清楚地看到 D-InSAR 测量的显着改进，这有助于更好地解释与泥石流事件相关的变形信号。据观察，舟曲泥石流导致罗家峪沟谷和三眼峪沟谷地表发生较大地震动。此外，我们发现索尔头滑坡在地质事件期间一直经历着温和的地面运动。
Differential interferometric synthetic aperture radar (D-InSAR) has been viewed as a promising technique in monitoring sudden geo-hazards (e.g., earthquake and landslide) in mountainous areas. However, the tough natural settings (e.g., steep slopes and vegetation) pose the D-InSAR technique to face many challenges. Among them, phase residuals induced by inaccurate topographic heights that can result in intolerable error have not been paid adequate attention. We present, in this paper, a new strategy of using D-InSAR measurements to characterize sudden geo-hazards with an emphasis on the correction of topographic errors. In the proposed strategy, a least squares model with an outlier detector is constructed to estimate the topographic errors from multi-baseline wrapped differential interferograms, and the error-prone phase unwrapping procedure is not needed. The new strategy is applied to the ALOS PALSAR images acquired for monitoring a giant mudslide occurred in Zhouqu County, China. After refining the topographic height originally from the inaccurate ASTER GDEM, notable improvements to the D-InSAR measurements can be clearly seen, which is helpful to better interpret the deformation signals associated with the mudslide event. It is observed that the Zhouqu mudslide had caused large ground movements in the Luojiayu and Sanyanyu groove valleys. In addition, we find that the Suoertou landslide has been experiencing moderate ground movements during the geologic event.
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影响因子：
4.8
作者：
G. Ducret;M. Doin;R. Grandin;C. Lasserre;S. Guillaso
通讯作者：
G. Ducret;M. Doin;R. Grandin;C. Lasserre;S. Guillaso
影响因子：
56.9
作者：
H. Xin
通讯作者：
H. Xin
DOI：
10.1109/tgrs.2002.803792
发表时间：
2002-11-01
影响因子：
8.2
作者：
Berardino, P;Fornaro, G;Sansosti, E
通讯作者：
Sansosti, E
影响因子：
8.2
作者：
Ferretti, A;Prati, C;Rocca, F
通讯作者：
Rocca, F
影响因子：
1.3
作者：
Ding, XL;Liu, GX;Chen, YQ
通讯作者：
Chen, YQ