msl or MSL 1
msl or MSL 1 :
Abbreviation for "above mean sea level," often seen in measurements of altitude, as in m (msl) for meters above mean sea level or ft msl for feet above mean sea level. "Mean sea level" is defined to be the average height of the sea, for all stages of the tide, as measured over a 19-year Metonic cycle (see above)
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