Question

mean sea level value ​

Answer 1

Answer:

Mean sea level value:

Mean sea level is an average level of the surface of one or more of Earth's bodies of water from which heights such as elevation may be measured.

Answer 2

Answer:

Compare half-tide level, still-water level.

Explanation:In the United States, mean sea level is defined as the mean height of the surface of the sea for all stages of the tide over a 19-year period. Selected values of mean sea level serve as the sea level datum for all elevation surveys in the United States. In meteorology, mean sea level is used as the reference surface for all altitudes in upper-atmospheric work; in aviation it is the level above which altitude is measured by a pressure altimeter. Along with mean high water, mean low water, and mean lower low water, mean sea level is a type of tidal datum.

Compare half-tide level, still-water level.