ARE WE DROWNING? URBAN LAND SUBSIDENCE IN THYBOR?N, DENMARK, FROM ERS-2 AND SENTINEL-1 IMAGERY AND PRECISION LEVELING

摘要

We assess the potential in information on rates of vertical land deformation, which is useful for, e.g., climate change adaptation. The optimal results are obtained from observations with a high spatial coverage, such as those from Sentinel-1 Synthetic Aperture Radar Interferometry (InSAR) data. However, challenges exist in creating an awareness of the data and ensuring that end-users at a local level can accurately interpret and efficiently implement them into their respective businesses. We address these challenges via a case study over the low-lying Danish coastal town Thybor?n. This is situated on a sandy coastal barrier on the high-energy North Sea coast by the entrance to the Limfjord. Deformation rates are obtained from time series of precision leveling and GPS measurements as well as ERS-2 and Sentinel-1 InSAR data. The study points to a potential solution for obtaining a public awareness and use of deformation maps.