- Metres above the Adriatic
Metres above the Adriatic (German: Meter über Adria) is an elevation reference system used in Austria and some other European countries based on the average water level of the Adriatic Sea at the Molo Sartorio in Triest harbour. Whilst the former Yugoslavian states still use this datum, in 1945 the former Austro-Hungarian states in the Eastern Block switched to the Kronstadt Gauge.
The individual countries using this datum abbreviate it in different ways depending on their local language, as follows:
- 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
Height differences between Austria and its neighbours
In Austria orthometric height is used. Austria's neighbours use other height systems which leads to differences between the heights. On the state borders these differences are:
- Germany: +25 to +34.6 cm (normal-orthometric height – Amsterdam Tide Gauge – Normalnull)
- Italy: −0.5 to −3.2 cm (orthometric height – Genua Tide Gauge)
- Switzerland: −1.6 to −7.5 cm (orthometric height – Marseille Tide Gauge – Metres above the Sea (Switzerland))
- Slovakia: +57 cm (normal height – Kronstadt Tide Gauge)
- Slovenia: −8 to −12 cm (normal-orthometric height – 1900 Trieste Tide Gauge)
- Czech Rep.: +46 to +56.3 cm (normal height – Kronstadt Tide Gauge) and
- Hungary: +49.6 to +60.6 cm (normal height, hungarian Tengerszint feletti magasság – Kronstadt Tide Gauge).
(Differences: HAustria − Hneighbouring states)
- ^ May be abbreviated in English to m AA.
- ^ Map with height differences by the Austrian Federal Office for Metrology and Survey (Bundesamt für Eich- und Vermessungswesen)
- Geodätisches Institut Zagreb (mainly Croatian, partly English)
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