| Property | Value |
|---|---|
| dcterms:created | 2022-05-12T15:14:07
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| rdf:value | 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.
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| dcterms:source | http://wiki.gis.com/wiki/index.php/Chart_datum
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