Sunday, February 5, 2017

Underwater mobile mapping

DOF Subsea, Sonardyne, 2G Robotics, and Seatronics successfully demonstrated a new underwater surveying technique that could significantly shorten the time needed to map underwater structures and offshore sites.
The new technique uses a 3D laser scanner fitted to an ROV to create highly detailed, point cloud images of subsea assets and environments.
By combining the 3D laser data with precise underwater acoustic and inertial navigation information, it is now possible to generate centimetre resolution engineering models from which accurate measurements can be instantaneously and repeatably captured.

When navigating poorly charted or unfamiliar areas, commercial ships, expedition cruise ships and naval vessels remain vulnerable to groundings and collisions with submerged objects.
This is where underwater forward looking sonar technology provides a solution.
NOAS (Navigation and Obstacle Avoidance Sonar) works by scanning a wide area in front of a vessel with multiple sonar ‘pings’ to create a highly detailed, 3D model of the sea floor and water column along a vessel’s course.
Water depth, underwater features and potential hazards to a range of up to 600 metres over a 90 degree field of view are displayed.

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