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Metres above the Adriatic

Metres above the Adriatic (Italian: Metri sopra l'Adriatico, German: Meter über Adria, Serbo-Croatian: Metara iznad Jadrana) is the vertical datum used in Austria, in the former Yugoslavian states of Slovenia, Croatia, Bosnia-Hercegovina, Serbia, Montenegro, North Macedonia, as well as in Albania to measure elevation, referring to the average water level of the Adriatic Sea at the Sartorio mole in the Port of Trieste.

Austria: m ü. Adria, m.ü.A. or müA, colloquially known as Seehöhe or Adriahöhe

Hungary: mAf from méter Adria felett

Former Yugoslavian states: m. i. J. from Metara iznad Jadrana

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

: +25 to +34 cm, normal height according to the Normalhöhennull levelling system based on the Amsterdam Ordnance Datum

Germany

: −0.5 to −3.2 cm, orthometric height referring to Genoa Tide Gauge

Italy

and Liechtenstein: −1.6 to −7.5 cm, orthometric height – 'Metres above the Sea' (Meter über Meer) based on the elevation of the Pierres du Niton in Lake Geneva at 373.6 m (1,226 ft) above average Marseille Tide Gauge

Switzerland

: +57 cm, normal height based on Kronstadt Tide Gauge

Slovakia

: −8 to −12 cm, orthometric height – metres above the sea referring to Koper Tide Gauge[1]

Slovenia

: +46 to +56.3 cm, normal height based on Kronstadt Tide Gauge, and

Czech Republic

: +49.6 to +60.6 cm, normal height – 'Height above Sea Level' (Hungarian: Tengerszint feletti magasság) based on the elevation of the Nadap benchmark at 173.1638 m (568.123 ft) above Kronstadt Tide Gauge.

Hungary

In Austria orthometric height is used, while its neighbours use other height systems, which leads to differences. On the state borders these differences are:


(Differences: HAustria − Hneighbouring states)[2]

Metre

(equivalent in Germany)

Normalhöhennull (NHN)

Metres above the Sea (Switzerland)

(in Italian)

Trieste Institute of Marine Sciences

(in German) Archived 2013-05-07 at the Wayback Machine

Austrian Federal Office of Metrology and Surveying

45°38′49″N 13°45′36″E / 45.646867°N 13.759867°E / 45.646867; 13.759867