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... > entities (en) > spatial units (en) > levels (en) > reference levels (en) > datum levels (en) > chart datum (en)

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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.

    来源: http://wiki.gis.com/wiki/index.php/Chart_datum

    创建: 5/12/22

    (en)

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http://aims.fao.org/aos/agrovoc/c_bd816e9e

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