Integrated PSInSAR and GNSS for 3D Displacement in the Wudongde Area

Jiaxuan Huang (), Weichao Du, Shaoxia Jin and Mowen Xie
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Jiaxuan Huang: Chinese-German Institute of Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China
Weichao Du: 32023 Troops, Dalian 116023, China
Shaoxia Jin: Chinese-German Institute of Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China
Mowen Xie: Department of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China

Land, 2024, vol. 13, issue 4, 1-20

Abstract: The major limitation of persistent scatterer interferometric synthetic aperture radar (PSInSAR) is that it detects only one- or two-dimensional displacements, such as those in the line of sight (LOS) and azimuth directions, by repeat-pass SAR observations. Three-dimensional (3D) displacement reflects the actual sliding surface and failure mechanism of a slope. To transform LOS deformation into a reliable 3D displacement, a new approach for obtaining the 3D displacement is proposed herein based on the slope deformation ( D s l o p e ). First, the deformation value calculated using the Global Navigation Satellite System (GNSS) as a constraint is used to eliminate the residual deformation of PSInSAR. Then, D s l o p e is obtained from the relationship between D L O S and the slope angle extracted from the digital elevation model (DEM). Finally, according to the geometric relationship between D s l o p e and D L O S , a novel approach for calculating 3D displacement is proposed. When comparing the 3D displacement extracted by the proposed method and that from GNSS data in Jinpingzi landslide, the root-mean-square error (RMSE) values were ±2.0 mm, ±2.8 mm, and ±2.6 mm in the vertical, north, and east directions, respectively. The proposed method shows high accuracy in 3D displacement calculation, which can help to determine the failure mechanism of a landslide. This method can be widely used in landslide monitoring in wide areas.

Keywords: PSInSAR; GNSS; slope deformation; 3D displacement; Wudongde area (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2024
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