IFC 4.3.0.1 (IFC4X3) development

# 8.18.3.2 IfcCoordinateReferenceSystem

ABSTRACT This definition may not be instantiated

## 8.18.3.2.1 Semantic definition

The IfcCoordinateReferenceSystem is a definition of a coordinate reference system by means of qualified identifiers only. The interpretation of the identifier is expected to be well-known to the receiving software.

The unambiguous identifier by which the coordinate reference system is know, is stored in the Name attribute. Well defined identifiers include the geodetic and often also the vertical datum. In these cases the GeodeticDatum and the VerticalDatum can be omitted.

## 8.18.3.2.4 Formal representation

ENTITY IfcCoordinateReferenceSystem
ABSTRACT SUPERTYPE OF (ONEOF
(IfcProjectedCRS));
Name : IfcLabel;
Description : OPTIONAL IfcText;
GeodeticDatum : OPTIONAL IfcIdentifier;
VerticalDatum : OPTIONAL IfcIdentifier;
INVERSE
HasCoordinateOperation : SET [0:1] OF IfcCoordinateOperation FOR SourceCRS;
END_ENTITY;

## 8.18.3.2.5 References

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