概念信息
此概念无该语言术语。
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定义
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The chart datum is the level of water that charted depths displayed on nautical charts are measured from. The chart datum is generally a tidal datum; that is, a datum derived from some phase of the tide. Common chart datums are lowest astronomical tide and mean lower low water.
(en)
上位概念
- datum levels (en)
其他语言
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法语
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书面挪威语
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URI
http://aims.fao.org/aos/agrovoc/c_bd816e9e
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