SUBSIDENCE MONITORING USING THE SMALL BASELINE SUBSET (SBAS) INSAR IN DONG TRIEU AREA, QUANG NINH

Abstract

The small baseline subset interferometric SAR (SBAS InSAR) method is now being studied and implemented in numerous locations worldwide to monitor surface displacement. The SBAS InSAR method enables the continuous and large-scale observation of displacements through the multi-temporal analysis of SAR (synthetic aperture radar) image data. In the article, the authors present the findings of experimental research that utilized the SBAS InSAR interferometry method and multi-temporal Sentinel-1A images to monitor the subsidence process at the Dong Trieu test area in Quang Ninh. Through 14 test sites, the SBAS InSAR method is employed to compare and evaluate the measurement results with the leveling measurement data. The coefficient of determination (R²) of the two data sets, as determined by SBAS and normalization, exceeds 0.66.