TY - JOUR
T1 - Temporal H/alpha target decomposition for landslide monitoring using Ku-band GB-SAR time series
AU - Izumi, Yuta
AU - Sato, Motoyuki
N1 - Funding Information:
Manuscript received November 26, 2020; revised February 8, 2021; accepted February 15, 2021. Date of publication March 2, 2021; date of current version March 31, 2021. This work was supported in part by JSPS Grand-in-Aid for Scientific Research under Grant (A) 23246076 and in part by the Grand-in-Aid for JSPS Research Fellows under Grand 18J20104. (Corresponding author: Yuta Izumi.) Yuta Izumi is with the Graduate School of Environmental Studies, Tohoku University, Sendai 980-8577, Japan (e-mail: yuta.izumi.r8@dc.tohoku.ac.jp).
Publisher Copyright:
© 2019 IEEE.
PY - 2021
Y1 - 2021
N2 - We investigate the applicability of the entropy (H)/ alpha (α¯) target decomposition realized by the temporally averaged coherency matrix, called temporal H/(α¯). We apply the temporal H/α¯ 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/α¯ 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/α¯ parameters over selected land cover types by comparing it with that derived by spatial averaging (spatial H/α¯) to explain the landslide monitoring results. Also, the rainfall effects on the temporal H/α¯ parameters are demonstrated. The temporal H and α¯ 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/α¯ 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/α¯ for the change-detection is discussed by comparing it with the classical spatial H/α¯ parameters.
AB - We investigate the applicability of the entropy (H)/ alpha (α¯) target decomposition realized by the temporally averaged coherency matrix, called temporal H/(α¯). We apply the temporal H/α¯ 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/α¯ 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/α¯ parameters over selected land cover types by comparing it with that derived by spatial averaging (spatial H/α¯) to explain the landslide monitoring results. Also, the rainfall effects on the temporal H/α¯ parameters are demonstrated. The temporal H and α¯ 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/α¯ 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/α¯ for the change-detection is discussed by comparing it with the classical spatial H/α¯ parameters.
KW - Debris avalanche
KW - GB-SAR
KW - Ground-based synthetic aperture radar
KW - H/alpha decomposition
KW - Ku-band
KW - Landslide
KW - Radar polarimetry
KW - Synthetic aperture radar
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U2 - 10.1109/JSTARS.2021.3062879
DO - 10.1109/JSTARS.2021.3062879
M3 - Article
AN - SCOPUS:85102279020
VL - 14
SP - 3318
EP - 3329
JO - IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
JF - IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
SN - 1939-1404
M1 - 09366990
ER -