CharacterString anchorDefinition[0..1], in Class CD_Datum

Documentation
The datum definition - a description, possibly including coordinates of an identified point or points, of the relationship used to anchor the coordinate system to the Earth or alternate object.

- For a geodetic datum, this anchor may be a point known as the fundamental point, which is traditionally the point where the relationship between geoid and ellipsoid is defined, together with a direction from that point. In other cases, the anchor may consist of a number of points. In those cases, the parameters defining the geoid/ellipsoid relationship have then been averaged for these points, and the coordinates of the points adopted as the datum definition.

- For an engineering datum, the anchor may be an identified physical point with the orientation defined relative to the object.

- For an image datum, the anchor is usually either the centre of the image or the corner of the image. The coordinate system orientation is defined through the CS_AxisDirection class.


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