The user may define subclasses of this class.
The spatial referencing contains seven components.
coordSystem: concerns the way horizontal and vertical coordinates are defined.
geodeticReference: provides ellipsoid and vertical datum information.
hydrographic: includes tidal and sounding information.
control: supplies vertical and horizontal control information.
transform: gives transformation criteria necessary to generate correct coordinates, if the data has been transformed in some way; this can be used for example if the coordinates have been scaled to values between 0 and 1 or if the coordinates are relative to some starting point.
remarks: a comment can also be provided.
likelyPositionalError: a non-statistical estimate of positional error given in metres. If detailed statistical positional error information is available it is more appropriately provided under the metadata subclass Quality as part of CoordinateAccuracy. If such detailed information is not available, rough estimates of positional error can be provided through this attribute. For example, on a given study, an investigator might indicate that the position is accurate to 10 metres without having an associated statistical method.
Note that any processing history which may have been performed on the data, such as geometric rectification for example, may be described under lineage, assuming such an attribute from the class Lineage has been specified at the geographic object level.