Deformation of the Baige Landslide, Tibet, China, Revealed Through the Integration of Cross‐Platform ALOS/PALSAR‐1 and ALOS/PALSAR‐2 SAR Observations

Twenty‐eight ALOS/PALSAR‐1 and ALOS/PALSAR‐2 images acquired from January 2007 to August 2018 were exploited to characterize the deformation history and temporal evolution of the Baige landslide, China, which successively occurred on 11 October and 3 November 2018. To mitigate the errors caused by t...

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Bibliographic Details
Published inGeophysical research letters Vol. 47; no. 3
Main Authors Liu, Xiaojie, Zhao, Chaoying, Zhang, Qin, Lu, Zhong, Li, Zhenhong
Format Journal Article
LanguageEnglish
Published Washington John Wiley & Sons, Inc 16.02.2020
Wiley
Subjects
Baige landslide
Deformation
deformation monitoring
Heavy rainfall
Image acquisition
Landslides
Landslides & mudslides
Monthly precipitation
offset tracking
Platforms
Rain
Rainfall
Soil
Soil moisture
Synthetic aperture radar
Tracking
China
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Summary:Twenty‐eight ALOS/PALSAR‐1 and ALOS/PALSAR‐2 images acquired from January 2007 to August 2018 were exploited to characterize the deformation history and temporal evolution of the Baige landslide, China, which successively occurred on 11 October and 3 November 2018. To mitigate the errors caused by the topographic relief and to conduct offset estimates between the SAR images from different platforms, a novel offset‐tracking method is proposed. The SAR images were ortho‐rectified firstly. Then two‐dimensional deformations were retrieved successfully from SAR images acquired at an identical platform and different platforms. Our results indicate that the maximum cumulative deformation in the line‐of‐sight direction of the Baige landslide reached about −60 m between January 2007 and August 2018. Furthermore, correlation between time series deformation and monthly precipitation and soil moisture derived from SAR intensity images suggests that the failure of the Baige landslide was closely related to the heavy rainfall in the summer of 2018. Key Points An improved time series SAR offset‐tracking chain is proposed to extract the long‐term and large gradient landslide motion For the first time accurate pixel offsets between cross‐platform SAR data sets are achieved The cumulative deformation of <−60 m and temporal evolution over 11 years are successfully retrieved at the Baige landslide
Bibliography:ObjectType-Article-1
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content type line 14
ISSN:0094-8276
1944-8007
DOI:10.1029/2019GL086142