Multi-Temporal Land Deformation Monitoring in V Shape Area Using Quasi-Persistent Scatterer (Q-PS) Interferometry Technique

Kelok Sembilan area, West Sumatra, Indonesia located in `V' contour shape is playing an important role to support the transportation connection in the center of Sumatra. However, in the rainy season, landslide event was high along this way, then monitoring and mapping a necessity to for minimizing its impact. Quasi-Persistent Scatterer Interferometry (Q-PSI) technique was applied for extracting information of land deformation on the area from time to time. Beside have high performance for detecting land deformation, Q-PSI technique was selected to improve the number of PS point. It's required beccause the method applied to vegetation area with short wavelength SAR (C-Band). This research was supported by 90 scenes of Sentinel-1A taken from October 2014 to November 2017 for ascending and descending orbit. Both satellite orbits detected two critical location of land deformation namely as zone A and Zone B located in steep slope that more than 500 mm movement in the line of sight (LOS).