sea level-¹ The level of the surface of the sea; used to approximate the surface of the reference ellipsoid. ² Sea level at its mean position midway between the mean high and low water adopted as a standard for the measurement of heights; mean sea level.

Sea Level Datum of 1929—See Datum, Sea Level, 1929; datum, tidal; mean tide level

sea level factor—The factor applied to ground measurements to reduce measurements to a common datum. Applicable in geodetic and star plane coordinate computations.

sea level variation—Sea level varies from day to day, from month to month and from year to year. This variation is attributed to meteorology conditions and should not be confused with the lunar tides.

sea mile—See mile, nautical.

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Source: NSPS “Definitions of Surveying and Related Terms“, used with permission.

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