Height above mean sea level

Height above mean sea level is a measure of a location's vertical distance (height, elevation or altitude) in reference to a vertical datum based on a historic mean sea level. In geodesy, it is formalized as orthometric height. The zero level varies in different countries due to different reference points and historic measurement periods. Climate change and other forces can cause sea levels and elevations to vary over time.[1]

  1. ^ "Sea Level: Frequently Asked Questions and Answers" Liverpool, UK: National Oceanography Centre. Retrieved 31 January 2024.
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