Land Subsidence Prone Areas Identification in Yogyakarta City using Sentinel-1 Imageries

Abstract

Yogyakarta is the city with the raising in population growth every year. Population growth demands more land and water consumption. Land-use changes from natural to a built-up area like residential or commercial areas will increase the load of the land and decrease the water infiltration area. The intensively land-use changes have been lowering the ground-watersurface with an average rate of 30 centimeters per year. The increase of land load and the lowering of the ground-water surface are implications of land subsidence. This study aims to map and to estimate the rate of land subsidence in Yogyakarta City. This study used remote sensing technology, especially an active remote sensing system. An Interferometric Synthetic Aperture Radar (InSAR) technique applied form Sentinel-1 radar satellite imageries can show the location and pattern of land subsidence. This study shows that there is subsidence in the city of Yogyakarta. The total subsidence that occurred in 2015 to 2017 did not show any specific pattern, whereas in 2019 & 2019 there was an increase in the intensity of subsidence in the southeast.