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What is the altitude above mean sea level all earth's lands, together, have? Is there any known answer to this question? It would fit here I think... Undead Herle King (talk) 00:26, 6 September 2009 (UTC)
What exactly is this map about? There is nothing in the article about "vertical references" or "vertical reference systems". Rui ''Gabriel'' Correia (talk) 23:57, 14 September 2013 (UTC)
About different vertical Geodetic datums / height definitions / height references used troughout Europe. There can be an virtual drop between two countries using different vertical references systems. The Zero-level elevation of Heights above mean sea level is often derived at one point in time from an ever changing main Sea level, but normally not equal to it. --Rknbg (talk) 10:38, 5 October 2013 (UTC)