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the average height of the surface of the sea for all stages of the tide, level above which altitude is measured by a pressure altimeter
merepinna tase, mis on arvutatud mingi pikema perioodi tunniandmete aritmeetilise keskmisena, aeroloogias kõigi kõrguste algnivoo, lennunduses algtase, millest kõrgemal mõõdetakse kõrgust baromeetrilise altimeetriga
