The project aims to collect high-quality and high-resolution data on floating objects in coastal waters near the mouth of the River Elbe. It will use a seaplane on clear and still (low wind) days to collect data at the same time as the Copernicus Sentinel-2 satellites collect data of the same location. In this way, the project will assess and validate the ability of Sentinel-2 and developed algorithms to monitor floating plastic marine litter from space.