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datum
Definição1
A reference from which measurements are made. For example, mean sea level is a datum for measuring true altitude, and the freezing point of pure water is a datum for measuring temperature.
Fonte1
CRANE, Dale (ed.). Dictionary of aeronautical terms. 2nd ed. Renton: ASA, 1991.
Definição2
An imaginary vertical plane or line from which all measurements of moment arm are taken. The datum is established by the manufacturer.
Fonte2
ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS. NBR 15971-4: aeronáutica – vocabulário – parte 4: propulsão aeronáutica. Rio de Janeiro, 2011. 44 p.
Nota Adicional1
Information regarding this term is a result of researches developed by DECEA in cooperation with ANAC.
Contexto
SAR facilities and personnel using electronic navigation systems (e.g., GNSS) must ensure their navigation devices are set to the appropriate datum and co-ordinate system.
Subárea
Aviation General Terminology
Narrower Term
geodetic datum
Français
référentiel