2065: Sea Levels Aug 10, 2020

 When elevation is measured from sea level, this is a different use of the phrase than when for instance people describe sea levels rising. In essence they both refer to the average placement of the surface of the water, but since sea level as a reference for elevation would be an impractical measurement if one needed to also account for the changing daily tides and waves etc which are not even consistent around the world, the ordinance data of different places will not change, even if the actual levels of the ocean shift. That is to say, sea levels are basically as constant a variable as pounds or yards.

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