While dry-docked, Marine Measurements can laser measure the hull and deck, collecting "As-is" data.
Taking hull lines is also know as pulling lines or offsets. Laser scanning can measure between 250,000 and 960,000 points per/second.
Naval Architects and Marine Engineers use 3D models, hull line, or hull offsets, to product stability booklets and documentation. This data can be submitted to the US Coast Guard.