source: http://en.wikipedia.org/wiki/BathymetryBathymetric maps are similar in concept to hypsometric maps but instead are focused on the depths of underwater "terrain". Early measurements were taken using depth sounding (literally dropping a rope down to the ocean floor and taking a measurement of its depth). Now sonar is used (or LIDAR/LIDAR) to produce a digital read-out of the ocean floor depths.
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