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Multibeam Surveys
Multibeam echosounders collect soundings with a wide, fan-shaped swath of acoustic beams. Swath data are interfaced with a precision positioning system, which includes 3-D translational and rotational motion sensors to map soundings in geodetic space.
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The specific advantages of multibeam include greater data density, the ability to fully describe bottom topography at high resolution and the ability to detect features. Repeated multibeam surveys enable the production of an accurate surface difference map which highlights areas of sediment deposition and erosion and yields more accurate volume change estimates.