A Bathymetric map is a type of contour map that measures sea floor elevation. It is measured and designed in the same way as a topographic map. The depth of the ocean floor is measured through the use of depth sounding. The picture above shows a bathymetric map of the world’s oceans. The different depths are easily seen through use of a key: the deeper the ocean, the deeper the color blue. Bathymetric maps are useful for marine navigation and studies.
http://maps.grida.no/go/graphic/world-ocean-bathymetric-map
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