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A misnomer for collection of datums used in mapping, charting, and geodesy which are not strictly planar. This term should not be used.

Related Terms


  1. The coordinated and correlated dimensional data used in geodesy and cartography to determin


A special unit employed in geodesy and geophysics to express the acceleration due to gravity. The gal is a unit accepted temporarily for use with the International System of Units; 1 gal is equal to 1 centimeter per second, per second.


The science of the determination of the size and shape of the earth


The determination of the linear vertical distance between a reference point or datum plane and the surface of a liquid or the top of a pile of divided solid.

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