Meter over Adria
meter over Adria (abbreviation m and. Adria) is an indication of the sea-height concerning the middle level of the Adria at the Molo Sartorio of Triest. This reference value is particularly in south Europe and countries of the earlier Austrian-Hungarian monarchy common.
Each levellingrefers to a defined reference surface, which the Geoid or a level of the sea level averaged of many years is normally. For Western Europe this is usually Normalnull (NN), the level of Amsterdam. Other traditional reference surfaces are and. A. the levels of Genova, king mountain (Kaliningrad), Crowning city (Russia) and Marseille.
The difference between Normalnull and meter over Adria amounts to - depending upon situation in the regional leveling net - up to 30 cm.