The client:
GPS Marine and Civil Services
The challenge:
During the renovation of Creekmouth Wharf, the design team had conflicting information on the position of the below deck structural assets. A below deck survey was requested, however, the riverbed below was not accessible by foot due to deep silt and tide movements.
The solution:
A target-based registration method was used to conduct an above deck pointcloud survey. Total Station observations determined the targets' coordinates using the client-provided coordinate system.
Targets that could be seen from the waterline below were positioned around the deck's face.
At Barking Riverside, the survey team boarded a small multifunctional ship and headed to Creekmouth dock.
A Trimble X9 was used to scan the underside of the deck while maintaining line of sight to the previously placed targets, a 4m tripod was pushed into the riverbed at several points along the wharf's face.
In order to create a PointCloud of the entire region, scan data from the above and below decks was registered during post processing.
Our in-house CAD team modelled the PointCloud data to provide the client with a fully vectorised 3D CAD model.