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Long-Term Land Deformation Monitoring Using Quasi-Persistent Scatterer (Q-PS) Technique Observed by Sentinel-1A: Case Study Kelok Sembilan

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Document pages: 13 pages

Abstract: Located on the mountainous area, Kelok Sembilanflyover area in West Sumatra, Indonesia has a long history of land deformation,therefore monitoring and analyzing as continuously is a necessity to minimizethe impact. Notably, in the rainy season, the land deformation occurs alongthis area. The zone is crucial as the center of transportation connection inthe middle of Sumatra. Quasi-Persistent Scatterer (Q-PS) Interferometrytechnique was applied for extracting informationof land deformation on the field from time to time. Not only does the methodhave high performance for detecting land deformation but also improve thenumber of PS point, especially in a non-urban area. This research supported by90 scenes of Sentinel-1A (C-band) taken from October 2014 to November 2017 forascending and descending orbit with VV and VH polarization in 5 × 20 m (range × azimuth) resolution. Both satellite orbits detected two criticallocations of land deformation namely as zone A and Zone B, which located inpositive steep slope where there is more than 500 mm movement in the Line ofSight (LOS) during acquisition time. Deformations in the vertical andhorizontal direction for both zone, are 778.9 mm, 795.7 mm and 730.5 mm, 751.7mm, respectively. Finally, the results were confirmed by ground truth datausing Unmanned Aerial Vehicle (UAV) observation.

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