Analysing the impact of urbanisation on land subsidence in Bangkok metropolitan area using DInSAR technique

Land subsidence particularly occurs where the intense urbanization implies increasing water consumption with a significant pumping of the aquifers. In Bangkok metropolitan area, with its rapid urbanization processes, groundwater is the main resource for household and industry. In recent years, land subsidence has been identified an important issue in this region. To investigate the land subsidence, the use of Synthetic Aperture Radar (SAR) technique has been considered an efficient approach. Since April 2014, Sentinel-1 data are freely available via the ESA's Sentinels Scientific Data Hub. In this study, Sentinel-1 SAR images were therefore collected over the 2015 - 2017 period focusing on Bangkok metropolitan including the coastal area. The results are achieved by Differential Synthetic Aperture Radar Interferometry (DInSAR) technique, which generates a land subsidence map, aided by Geographical Information System (GIS). This study shows the recent land subsidence rates and its correlation to urban development map, and also illustrates the applicability of Sentinel-1 data for land subsidence detection monitoring.