. "height above mean sea level"@en . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "height above mean sea level"@en . . . . . . . . "height above mean sea level"@en . . . . . . "elevation of a location in reference to a historic mean sea level taken as a vertical datum"@en . . . . . . .