of the procedures of the sea or the height of sea level is a term to the amount of the height of a complication or point on land or air from the surface, the average water refers.

this so-called knowledge, atmospheric, etc. Aeronautics, communications, remote and in the radiation of the radio to estimate the level of coverage of the waves is used. Features of the height of sea level can be:

1) every 1000 m increase in altitude., the 6-degree reduction in temperature
2) each 300 m increase in altitude., the UV rays of the sun, a 4% increase

named.