Small Baseline Subset Interferometric SAR technique for spatiotemporal analysis of the Regent landslides

Monitoring ground surface deformation is one key for an early warning system to mitigate against landslide damages. In this study, the SBAS-InSAR technique was applied to analyze forty-seven SLC Sentinel-1A C-band SAR datasets acquired in the interferometric wide-swath (IW) mode for the detection of the time-series surface deformation leading to the Regent landslide events in 2017, Sierra Leone. The potential landslide sites were also identified in the area. It is argued that if the monitoring program using the SBAS-InSAR technique were in place in 2017, an early warning of the imminent slope failure could have been given some days before the landslide events occurred on 14 August 2017.