Temporal H/alpha Target Decomposition for Landslide Monitoring Using Ku-Band GB-SAR Time Series
Temporal H/alpha Target Decomposition for Landslide Monitoring Using Ku-Band GB-SAR Time Series
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使用 Ku 波段 GB-SAR 时间序列进行滑坡监测的时间 H/alpha 目标分解
DOI：
10.1109/jstars.2021.3062879
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发表时间：
2021
影响因子：
5.5
通讯作者：
Motoyuki Sato
中科院分区：
文献类型：
--
作者：
Yuta Izumi;Motoyuki Sato
我们研究了由时间平均相干矩阵（即时间H/（α′））实现的熵(H)/ α （α′）目标分解的适用性。利用地面合成孔径雷达（GB-SAR）连续监测数据的时间H/α值来表征散射机制的时间变化。本文以滑坡为例，展示了时间H/α′s技术在滑坡监测中的应用，以探测和研究时间散射机制。该研究获得了日本熊本南阿苏滑坡后斜坡的长期GB-SAR极化数据。本研究首先通过与空间平均H/α′s （spatial H/α′s）参数的比较，探讨了所选土地覆盖类型的时间H/α′s参数的性质，以解释滑坡监测结果。此外，还讨论了降雨对H/α _（）参数的影响。降水速率为52.5 mm/ H时，H和α′s值分别增大0.07°和13.54°。时间序列分析表明，滑坡发生时散射机制发生了明显的时间转变，后向散射平稳性发生了变化。通过与经典空间H/α′s参数的比较，讨论了时间H/α′s参数在变化检测中的适用性。
We investigate the applicability of the entropy (H)/ alpha (α̅) target decomposition realized by the temporally averaged coherency matrix, called temporal H/(α̅). We apply the temporal H/α̅ to ground-based synthetic aperture radar (GB-SAR) continuous monitoring data to characterize the scattering mechanism temporal change. As a case study, this work demonstrates the application of the temporal H/α̅ technique to landslide monitoring to detect and investigate the temporal scattering mechanism. The study acquired long-term GB-SAR polarimetric data over the postlandslide slope, Minami-Aso, Kumamoto, Japan. The study first investigated the property of the temporal H/α̅ parameters over selected land cover types by comparing it with that derived by spatial averaging (spatial H/α̅) to explain the landslide monitoring results. Also, the rainfall effects on the temporal H/α̅ parameters are demonstrated. The temporal H and α̅ values increase up to 0.07°and 13.54°, respectively, when the rainfall rate is 52.5 mm/h. The time-series analysis of the temporal H/α̅ indicates an obvious temporal transition of the scattering mechanism and a change of the backscattering stationarity when a landslide occurs. The applicability of the temporal H/α̅ for the change-detection is discussed by comparing it with the classical spatial H/α̅ parameters.