Contracted by 4D Ocean to provide a ASV Hydrographic Surveyor for the Equinor Norpipe Nearshore Pipeline Inspection Survey project. With a landfall in Greetseil, Germany, the very shallow bathymetry presents a number of problems for traditional pipeline inspection platforms. Instead, surveys were conducted at high water using 4D Ocean’s ASV Harry, a SeaRobotics 2.5m unmanned surface vehicle with an integrated Applanix POS MV and R2Sonic 2020 multibeam echosounder. Transported by road trailer, the deployment cart allows access to remote or inaccessible locations.
Topographic surveys were conducted at low water using 4D Ocean’s eBee UAV, a fully autonomous drone, which is used to capture high-resolution aerial photos that can be transformed into accurate orthomosaics and 3D models using photogrammetric techniques.