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mean sea level - [geodesy] The average height of the surface of the sea for all stages of the tide over a nineteen-year period, usually determined by averaging hourly height readings from a fixed level of reference.
[Category=Geospatial ]
Source: esri, 08 June 2012 09:06:48, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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