We offer a proven methodology and equipment inventory that provides a 21st-century solution to coastal asset inspection surveys.

High resolution point cloud data from seabed to rooftop

We provide a 3D perspective of assets that may have previously been inaccessible for efficient and accurate measurement techniques.

SEP Hydrographic combines high-specification survey sensors to create a high-density dataset. We merge marine and terrestrial survey techniques to produce high-resolution imagery of underwater structures, offering a cost-effective substitute for traditional methods such as diving or ROV inspection. 

Most terrestrial point cloud data datasets are derived from LiDAR scans, acquired from aerial or land-based sensors. However, when considering subsea assets, visible light techniques such as LiDAR are generally unsuitable for use in shallow water environments, due to rapid optical attenuation and turbidity through the water column. 

BIM Compatible
BIM Compatible
Integrated Datasets
Integrated Datasets
Online Client Data Viewer
Online Client Data Viewer
Above and below the waterline
Above and below the waterline

Pulsar is equipped with a suite of advanced equipment for asset inspection survey:

  • Multibeam echosounder to measure seabed bathymetry.
  • Scanning sonar to provide high-resolution 3D point cloud data below the waterline.
  • 360-degree camera.
  • Laser scanner for inspection above the waterline.

As far as we are aware, we are the only survey company in the UK with a motion-equipped 3D scanning sonar, which is permanently mobilised to our survey vessel 'Pulsar'. 

Read more about Pulsar

Our core Asset Inspection services include:

  • Routine monitoring of dock walls, sluices, caissons, lock gates, bridge abutments and other areas of interest
  • Scour and dredge monitoring
  • Emergency surveys following storm events or damage
  • Bridge clearance surveys
  • Post-construction confirmation surveys
  • Debris surveys
  • Flood risk mapping and volume calculations
  • Structural inspections

The key benefits to our surveys is that they:

  • Provide highly detailed data, removing the need for traditional visual inspection.
  • Are cost-effective.
  • Remove any subjectivity in interpretation.
  • Allow accurate monitoring of any integrity changes over time.
  • Enable improved site safety in comparison to diving services.

Watch our 3D flythrough to learn more.

What is the difference between a Multibeam Echosounder and Mechanical Scanning Sonar?

We often asked what the difference is between a traditional multibeam echosounder and a Mechanical Scanning Sonar (MSS) - read our article to learn more. 

Read more

In recent years, there has been significant interest in creating ‘Digital Twins’ of mission critical assets

Terrestrial surveying is well-established to produce datasets that can be considered ‘Digital Twins’, efforts to extend this capability underwater to inspect submerged infrastructure are gaining wider attention and uptake within the Asset Management sector.

These techniques can also be supplemented with UAV based LiDAR, photogrammetry and HD camera in addition to land-based laser scanning. Sensors can also be deployed from tripods or shore-side cranes where required.

Data is processed, analysed and compiled by specialist surveyors, with deliverables and timescales tailored to suit individual project needs.  This provides a 3D point cloud throughout, giving an accurate, useable baseline survey for future repeat asset integrity studies. Our 3D modelling of these assets provides essential data to help mitigate risk both now and in the future.