The term meters on the sea level (m s.l.m.) one refers as an exampleto the altitude of a geographic point (locality or the top of a mount) or an object suspended in flight (like an airplane) regarding the medium sea level .
The altitude regarding the sea level is used in the transmissions of marks them radio or television in order to estimate the area of cover of it marks them. An other I use very important, beyond to the determination of the points in the geographic maps, is the control of the altitude of flight of the aircrafts.
It is important to notice that the definition of sea level is artificial in how much is not possible to determine of an only value for all the ondosi planet, since it varies with the tides, movements and other factors. In aviation the ellissoide of World-wide Geodetic Sistemais used in kind like reference (that the same one used from systems GPS is ).
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