Bathymetry is the measurement of the depth of water bodies Echo sounding is effectively a special purpose application of sonar used to locate the bottom like oceans, rivers, or lakes. For high accuracy depths, usually restricted to special purpose or scientific surveys, a sensor may be lowered to measure the temperature, pressure and salinity The bathymetry is mainly used for Pre-dredge, dredge monitoring, post-dredge activities, Navigation, Pipeline laying, jetty / Wharf / breakwater / seawall / reverent constructions, shoreline changes / monitoring, calculating de-silting quantity, channel design etc.,

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