Retrieval of time series three-dimensional landslide surface displacements from multi-angular SAR observations
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A major limitation for wide application of Synthetic Aperture Radar (SAR) remote sensing in mapping landslide surface displacements is the intrinsic gap between the ultimate objective of measuring three-dimensional displacements and the limited capability of detecting only one or two-dimensional displacements by repeat-pass SAR observations of identical imaging geometries. Although multi-orbit SAR observations of dissimilar viewing geometries can be jointly analyzed to inverse the three-dimensional displacements, the reliability of inversion results might be highly questionable in case of continuous motion because of the usually asynchronous acquisitions of multi-orbit SAR datasets. Aiming at this problem, we proposed an approach of retrieving time series three-dimensional displacements from multi-angular SAR datasets for step-like landslides in the Three Gorges area in this article. Firstly, time series displacements of a common ground target in the azimuth and line-of-sight (LOS) direction can be estimated using traditional methods of SAR interferometry (InSAR) and SAR pixel offset tracking (POT), respectively. Then, a spline fitting and interpolation procedure was employed to parameterize the displacement history in the sliding/dormant periods of step-like landslides and estimate displacements from multi-angular observations for identical date series. Finally, three-dimensional displacements can be inverted from these synchronized multi-angular measured displacements in traditional ways. As a case study, the proposed method was applied to retrieve the three-dimensional displacements history of the Shuping landslide in the Three Gorges area, China. Comparisons between SAR-measured displacements and measurements of global positioning system (GPS) showed good agreement. Furthermore, temporal correlation analyses suggest that reservoir water level fluctuation and rainfall are the two most important impact factors for the Shuping landslide stability.
KeywordsPixel offset tracking Step-like landslide Three-dimensional displacement Three Gorges Water level
This work was financially supported by the National Key R&D Program of China (Grant No. 2017YFB0502700), the National Natural Science Foundation of China (Grant Nos. 61331016, 41702376, and 41774006), and Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) (Grant No. CUG170634). The TerraSAR-X datasets were provided by German Aerospace Center (DLR) through the General AO project (GEO0606) and TSX-Archive AO projects (GEO1856 and GEO2845).
- Cigna F, Osmanoğlu B, Cabral-Cano E, Dixon TH, Ávila-Olivera JA, Garduño-Monroy VH, DeMets C, Wdowinski S (2012) Monitoring land subsidence and its induced geological hazard with synthetic aperture radar interferometry: a case study in Morelia, Mexico. Remote Sens Environ 117:146–161CrossRefGoogle Scholar
- Du J, Yin K, Lacasse S (2012) Displacement prediction in colluvial landslides, Three Gorges Reservoir, China. Landslides, 1–16Google Scholar
- Jung HS, Lu Z, Won JS, Poland MP, Miklius A (2011) Mapping three-dimensional surface deformation by combining multiple-aperture interferometry and conventional interferometry: application to the June 2007 eruption of Kilauea volcano, Hawaii. IEEE Geosci Remote Sens Lett 8:34–38CrossRefGoogle Scholar
- Lu S, Yi Q, Yi W, Huang H, Zhang G (2014) Analysis of deformation and failure mechanism of Shuping landslide in Three Gorges reservoir area. Rock Soil Mech 35:1123–1130+1202Google Scholar
- Motagh M, Shamshiri R, Haghshenas Haghighi M, Wetzel H-U, Akbari B, Nahavandchi H, Roessner S, Arabi S (2017) Quantifying groundwater exploitation induced subsidence in the Rafsanjan plain, southeastern Iran, using InSAR time-series and in situ measurements. Eng Geol 218:134–151CrossRefGoogle Scholar
- Wang F, Zhang Y, Wang G, Peng X, Huo Z, Jin W, Zhu C (2007) Deformation features of Shuping landslide caused by water level changes in Three Gorges Reservoir area, China. Chin J Rock Mech Eng 26:509–517Google Scholar
- Wright TJ, Parsons BE, Lu Z (2004) Toward mapping surface deformation in three dimensions using InSAR. Geophys Res Lett 31 n/a-n/aGoogle Scholar
- Xia Y (2008) CR-based SAR-interferometry for landslide monitoring, geoscience and remote sensing symposium, 2008. IGARSS 2008. IEEE Int. IEEE, pp. II-1239-II-1242Google Scholar
- Xia Y (2010) Synthetic aperture radar interferometry. In: Xu G (ed) Sciences of geodesy - I. Springer, Berlin Heidelberg, pp 415–474Google Scholar
- Xia Y, Kaufmann H, Guo X (2002) Differential SAR interferometry using corner reflectors, geoscience and remote sensing symposium, 2002. IGARSS ‘02. IEEE Int 1242:1243–1246Google Scholar