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Articles

Volume 7, Number 3 (2006)

Height References in Hydrography

Submitted
August 13, 2013
Published
2006-12-12

Abstract

Geoid, ellipsoid, land levelling, mean sea level, lowest astronomical tide, are reference levels used by hydrographers. From survey to chart production, hydrography operational techniques, require precise levelling of chart datum with reference to one of these levels. This presupposes in one hand, precise definitions and, in the other, a critical assessment of consistency with general reference level requirements: stability, accessibility, precision.