Metres above the Adriatic ( Italian : Metri sopra l'Adriatico , German : Meter über Adria , Serbo-Croatian : Metara iznad Jadrana ) is the vertical datum used in Albania , Austria , Bosnia and Herzegovina , Croatia , Montenegro , North Macedonia , Serbia , and Slovenia to measure elevation , referring to the average water level of the Adriatic Sea at the Sartorio mole in the Port of Trieste .
5-753: The Birnlücke ( 2,665 m (AA) ) is the border pass at the western end of the Hohe Tauern mountains in Austria , between the Venediger Group and the adjoining Zillertal Alps . The border between Austria and Italy has run over the pass since 1919. The pass forms the border between the Austrian state of Salzburg and the Italian province of South Tyrol , the valleys of the Krimmler Achental and Ahrntal , and
10-593: The Rieserferner-Ahrn Nature Park and Hohe Tauern National Park . Until the Schengen Agreement there used to be a regular border checkpoint at Krimmler Tauern (2,634 metres [8,642 ft]). Not far south of the border crossing at 2,441 m s.l.m. is the Birnlücken Hut ( Rifugio Tridentina ). It was built in 1900 and named after the pass. The name Birnlücke is a corruption of
15-522: The 1900 gauge ( Nadmorska visina, m/nv ). In Albania (normal-orthometric height) they also refer to heights as 'metres above the Adriatic', but use a specific tide gauge in the port of Durrës . The individual countries using this datum abbreviate it in different ways depending on their local language, as follows: 'Metres above the Adriatic' may be abbreviated in English to m AA In Austria orthometric height
20-582: The datum valid for the whole Austro-Hungarian monarchy . Whilst the former Yugoslavian states still use it, the Eastern Bloc successor states of Austria-Hungary like Hungary and Czechoslovakia after World War II switched to the Kronstadt Gauge of the Baltic Sea , which is 0.6747 m (2.214 ft) higher. Whilst for Austria the 1875 gauge is used as the datum, the states of former Yugoslavia use
25-719: The old spelling. As late as 1888 the pass was called Pyrlücke , after the old names for the stream, the Pirra or Birlbac h, in the Ahrn valley. The Italian name is Forcella del Picco . Metres above the Adriatic The gauging station in the Port of Trieste was established in 1875 by the local observatory run by the military geographical institute of the Austro-Hungarian Army . The average water surface elevation at Molo Sartorio became
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