How Mott MacDonald and BAM Nuttall safely digitised flood defences along a hazardous coastline in under 48 hours

In collaboration with:

100% safety


48 hour


Sensat captured the required data in just 2 days utilising UAVs.

The existing tidal defence infrastructure along the Hull frontage had been deteriorating. Mott MacDonald and BAM Nuttall needed a highly accurate digital replica of the site to aid with design and planning permission so they could assess the current flood risk and propose a solution. This digital twin would operate as a single source of truth about the spatial dimensions and features of the current coastal defences across 10km of complex waterfront.

The challenge

A manual, ground-based survey would involve putting workers on the ground in an extremely unsafe environment over 3 weeks. The years of operation had caused many waterfront areas to become clogged with sedimentation and moss. Some areas became completely inaccessible during high and medium tides.

The solution

By utilising UAVs, Sensat were able to capture, digitise and deliver an accurate 3D digital model of the site in just 2 days. Lendlease were able to completely circumnavigate the need for track access approval, land access approval, and traffic management; saving both time and money.

The visualisations created from the UAV survey included a high-density point cloud, DSM, orthomosaic, and 3D mesh. The data can be integrated with CAD and BIM to provide an incredibly detailed, versatile and collaborative digital environment in Sensat’s visualisation platform.


The resulting 3D model, captured faster and more cost-efficiently than traditional means, provided Lendlease with the visibility and insight they needed to design strategic infrastructure via constant access across multiple stakeholders.

2D Orthomosaic hosted on
Sensat's visualisation platform.