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IHO / OHI > IHO > Hydrographic Dictionary > Revised definition for MSL


Revised definition for MSL
 Moderated by: ihbpah  

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ihbpah
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 Posted: Tue Jun 3rd, 2014 07:43 am

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Proposed revised definition for Mean Sea Level (MSL) in line with IHO Resolution 3/1919, as amended, was finalized at TWLWG 6:
 
Current version:  
Mean Sea Level: The average height of the surface of the sea at a tide station for all stages of the tide over a 19-year period, usually determined from hourly height readings measured from a fixed predetermined reference level (chart datum).  
Proposed:  
Mean Sea Level: The average height of the surface of the sea at a water level station, determined from height readings measured over an appropriate period of time from a fixed predetermined reference level (chart datum).

Jean Laporte
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 Posted: Sun Jun 15th, 2014 05:09 pm

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Hi WG,

I am glad TWLWG 6 could achieve a shorter definition and get rid of hourly height measurements, which do not mean much with modern tide gauges.
However, I regret the 19-year period.
Do you know what they did with the previous lengthy complements?

Jean

ihbpah
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 Posted: Mon Jun 16th, 2014 09:44 am

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It was agreed the additional information included in the original 'long' version would be better included in a publication such as C-13.  The 19-year period was retained, after much discussion, due to the recommendation to cover a complete luna cycle.

Maria Alejandra
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 Posted: Thu Jun 19th, 2014 04:29 pm

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I really agree with the definition proposed.

Estoy de acuerdo con la definición propuesta ya que no se usan más alturas horarias.

jwootton
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 Posted: Tue Jun 24th, 2014 02:00 am

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I am happy with the revised definition.


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