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Not all datums are geodetic. Any measurement has an implied datum. 67.65.172.141 12:10, 2 August 2005
Here we go again "...which is almost identical to the NAD83 datum used in North America, is a common standard datum". There are other countries that use datums just like this one, but the sentence has no context in the article other than to drop a line about America again, which is getting a little ignorant of everyone else. 202.59.101.74 13:06, 6 April 2006 (UTC)
I agree you can merge some portion of this to geodesy or surveying, but Datum can be more broadly defined using measurement examples or the datums in fluid mechanics.
Is there a good reason to try and merge Datum into the Geodetic system article? A Datum or Geodetic Datum is a specific concept that is well defined and a nice self-contained chunk of knowledge, that happens to be associated with other stuff, including geodetic systems, geodesy, projections, etc. I favor keeping this as a separate item. IMO merging too much into very large articles defeats the purpose of wikipedia, which is accessibility to logical chunks of knowledge. Tjamison 20:57, 14 March 2007 (UTC)
I've expanded the section on vertical datums, to include details on the various fluctuations that are smoothed out when calculating mean sea level, and an explanation of why nautical charts use other datums. I also removed the claim that Mean Lower Low Water is he usual chart datum. This appears to be true in US waters, but most charts from most other countries normally use Lowest Astronomical Tide. (The chart datum page could probably be expanded to include a more detailed discussion of what datums are used and why and by whom). Wardog 14:38, 23 September 2007 (UTC)
OED has no record of the word datums. In the entry for datum, it is uniformly pluralised to data. It might be handy to provide some sources for this novel coinage. PRB ( talk) 08:23, 14 April 2010 (UTC)