datum plane

British  

noun

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

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Example Sentences

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

From New York Times

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg