When this chart was published by the National Institute for Water and Atmospheric Research in 1998, it changed people’s ideas about the sea floor around New Zealand. The colours indicate depth. Red and yellow depict shallower water (0–1,000 metres), while dark blue and purple show deep water (more than 5,000 metres). The use of coloured relief shading lent clarity to features such as the continent, canyons, and recently discovered seamounts and sea-floor channels. Much of this detail was the result of new mapping techniques using multiple sound beams.
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