datum plane

noun

1. surveying the horizontal plane from which heights and depths are calculated

Example Sentences

A datum plane, subtly inserted just above the ground floor window level, attempts to tie MoMA’s episodic facades together.

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Usually the contour has labeled on it in figures the height above some starting point, called the datum plane—generally sea level.

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In all maps that are to be contoured some plane, called the datum plane, must be used to which all contours are referred.

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The datum plane generally used in maps is mean sea level, hence the elevations indicated would be the heights above mean sea level.

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Usually the contour has labeled on it in figures the height above some starting point, called the datum plane--generally sea level.

Read more on Project Gutenberg