Hydrography6 min read
Reading a seabed through sound
A sonar return is a measurement, not a picture of the ocean floor. Turning it into a useful chart means accounting for the water, the moving vessel, and what the echo cannot identify on its own.
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Hydrography5 min read
The zero beneath a harbour
Chart datum connects a sounding to a tide height. Its local reference, time period and uncertainty explain why the zero beneath a harbour needs a name.