Height data used in Hungary are determined with reference to the potential surface (Baltic Sea basic level) belonging to the mean sea level of the Baltic Sea measured at Kronstadt. The type pf height is so called normal height (H), which is often called simply leveled height.

The representant in Hungary of Baltic-Sea basic level is the fundamental bench mark Nadap, the height of which amounts to H_Nadap = 173.1638 m with reference to the Baltic-Sea basic level.

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