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Lidar survey of tunnel

Hi everyone,

Any suggestion for 360 deg. Lidar for surveying a flooded tunnel, about 4m dia?

Thanks.

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You can 4 equally spaced multi beam sonars and an inertial system with a DVL. It takes a fairly large machine though.
Google wreck is the City of Chester. It has some interesting images of both the machine and data.

Thanks Kevin. As you say this would involve a fairly large ROV and access to the site is restricted. I like your thinking though!