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chart datum
chart datum, the datum to which the soundings shown on a chart are referred and above which heights of the tide are expressed in tide tables. The level is essentially one below which the sea surface seldom falls. The default tidal datum of the International Hydrographic Organization is the Lowest Astronomical Tide (LAT). The water level will almost never be lower that LAT. Not all hydrographic offices have adopted this datum, but the one used is generally given on the chart.
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"chart datum." The Oxford Companion to Ships and the Sea. 2006. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "chart datum." The Oxford Companion to Ships and the Sea. 2006. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O225-chartdatum.html "chart datum." The Oxford Companion to Ships and the Sea. 2006. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O225-chartdatum.html |
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chart datum
chart datum Datum, or plane, to which depth measurements on a chart are referred.
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Cite this article
AILSA ALLABY and MICHAEL ALLABY. "chart datum." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. AILSA ALLABY and MICHAEL ALLABY. "chart datum." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O13-chartdatum.html AILSA ALLABY and MICHAEL ALLABY. "chart datum." A Dictionary of Earth Sciences. 1999. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-chartdatum.html |
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