Datum
Datum
Glossary of cartographic terms
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Glossaries
Definition of datum
In surveying, a reference system for computing or correlating the results of surveys. There are tow principal types of datums: vertical and horizontal. A vertical datum is a level surface to which heights are referred. In the United States, the generally adopted vertical datum for leveling operations is the National Geodetic Vertical Datum of 1929. The horizontal datum is used as a reference for position. The North American Datum of 1927 is defined by the latitude and longitude of an initial point (Meade's Ranch in Kansas), the direction of a line between this point and a specified second point, and two dimensions that define the spheroid. The new North American Datum of 1983 is based on a newly defined spheroid (GRS80) it is an Earth-centered datum having no initial point or initial direction.
Source: http://oneresponse.info/resources/imtoolbox/publicdocuments/Glossary%20of%20Cartographic%20Terms%20-%202002.doc
(from Maps for America. Third Edition.)
Web site link: http://oneresponse.info
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Glossary of cartographic terms
Glossary of cartographic terms index of terms
Definition and meaning of datum
Meaning of datum
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