2021 CSDMS meeting-114
Mapping Localized subsidence of Lagos, Nigeria with Sentinel-1A/B Satellite Coverage
The recent growth in access to C-band Synthetic Aperture Radar (SAR) data through the European Space Agency (ESA) Sentinel-1A/B satellites and the upcoming NASA-ISRO Synthetic Aperture Radar (NISAR) mission provide increased opportunities for differential interferometric synthetic aperture radar (DInSAR) monitoring. Here we developed a dockerized supercomputer workflow that allows us to rapidly generate InSAR pairs from Sentinel 1 imagery using ISCE processing software(Rosen et al., 2012) at ~10 meter resolution.Results from this workflow are used to create a timeseries of subsidence for Lagos, Nigeria, where rapid urban growth has led to accelerated subsidence throughout the city. This growth has resulted in various flash floods due to infiltration and drainage issues in the last fifteen years(Atufu 2018), and the city is also vulnerable to coastal flooding. Next steps will include inputting our time series to determine how future flood events may impact specific areas of Lagos. Understanding where floods are a higher risk can allow for better distribution of rescue resources, and allow for targeted remediation and recovery efforts.