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What is meant by geodetic datum 1 markGeodetic datums 1 were created to define the size and shape of the Earth and the origin and orientation of the coordinate systems used to map the planet Hundreds of different datums have been used to frame position descriptions since the first estimates of the Earths size were made by Aristotle Datums have evolved from those describing a spherical Earth to ellipsoidal models derived from years of satellite measurementsModern geodetic datums range from flat-earth models used for plane surveying to complex models used for international applications which completely describe the size shape orientation gravity field and angular velocity of the Earth While cartography surveying navigation and astronomy all make use of geodetic datums the science of geodesy is the central discipline for the topicReferencing geodetic coordinates to the wrong datum can result in position errors of hundreds of meters Different nations and agencies use different datums as the basis for coordinate systems used to identify positions in geographic information systems precise positioning systems and navigation systems The diversity of datums in use today and the technological advancements that have made possible global positioning measurements with sub-meter accuracies requires careful datum selection and careful conversion between coordinates in different datumshttpwwwcoloradoedugeographygcraftnotesdatumdatumfhtml According to Princeton University 2 httpswwwprincetoneduachaneytmvewiki100kdocsDatumgeodesyhtml A geodetic datum plural datums not data is a reference from which measurements are made In surveying and geodesy a datum is a set of reference points on the Earths surface against which position measurements are made and often an associated model of the shape of the Earth reference ellipsoid to define a geographic coordinate system Horizontal datums are used for describing a point on the earths surface in latitude and longitude or another coordinate system Vertical datums measure elevations or depths In engineering and drafting a datum is a reference point surface or axis on an object against which measurements are madeWhat is meant by NAD27 and where it is
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