Application of Time-Series Sentinel-1A for Land Deformation in Central Aceh, Indonesia

Jefriza, Jefriza and Yusoff, Izham Muhammad and Abir, Ismail Ahmad and Syahreza, Saumi and Razi, Pakhrur and Lateh, Habibah and Rusdi, Muhammad (2019) Application of Time-Series Sentinel-1A for Land Deformation in Central Aceh, Indonesia. In: The 9th International Symposium for Sustainable Humanosphere (ISSH), 28-29 Oktober 2019, Bogor.

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Abstract

Various decorrellation phenomena of Interferometric Synthetic Aperture Radar (InSAR) have led researchers to develop several MultiTemporal (MT-SAR) techniques with the application of time series/stack of images. InSAR involves the interaction of electromagnetic waves known as interference, to measure precise distances between the target and the sensor to derive a landscape topography and its subtle changes in elevation. Central Aceh, located in North of Sumatra Island, Indonesia was chosen for the study area as the Island consists of soft soil and Sumatra Faults from the geological point of view. Data were acquired from Sentinel-1A and ALOS PALSAR-1 satellites, where Quasi-Persistent Scatterer (Q-PS) and Small Baseline Subset (SBAS) methods were applied respectively. From the results, the subsidence and uplift areas were mapped and verified with others publication. The velocity subsidence at Nunang and Musara Alun villages were found to range from 2.4 to 5.7 and 0.6 to 2.3 mm/year, respectively which corresponded to the results obtained by other research publication. The deformation in Central Aceh needs continuous monitoring using InSAR as the place is a landslide prone area because of the nature of the terrain connected to the earthquake zones.

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