The observed level of the sea surface relative to a predefined datum at any instant of time
The height or level of the sea surface at any time It is used as a reference for elevations above and below
water level, average height of the water in the open seas, mean level of the sea's surface
The ocean surface; the mean level between high and low tides Geographers use sea level to measure the height of the Earth: Denver, Colorado--the mile high city--is a mile over sea level
The height or level of the sea surface at any time It is used as a reference for elevations above and below Refer to mean sea level
Sea level is the average level of the sea with respect to the land. The height of mountains or other areas is calculated in relation to sea level. The stadium was 2275 metres above sea level. The level of the ocean's surface, especially the level halfway between mean high and low tide, used as a standard in reckoning land elevation or sea depths. above/below sea level. Position of the air-sea boundary, to which all terrestrial elevations and submarine depths are referred. The sea level at any location changes constantly with changes in tides, atmospheric pressure, and wind conditions. Longer-term changes are influenced by changes in the Earth's climates. Consequently, the level is better defined as mean sea level, the height of the sea surface averaged over all stages of the tide over a long period of time