##### Above Sea Level (ASL) Height above mean sea level is a measure of the vertical distance (height, elevation or [[altitude]]) of a location in reference to a historic mean sea level taken as a vertical datum. Mean sea levels are affected by climate change and other factors and change over time. For this and other reasons, recorded measurements of elevation above sea level at a reference time in history might differ from the actual elevation of a given location over sea level at a given moment. >Covered in: >Mentioned in: >References: [[WP Height above mean sea level|🌍]] >Required by: > >Related to: