Agreement to clarify the export of a Building Storey and its local placement

Based on          IFC2x3

Initiator            Official buildinSMART IFC2x3 CV2.0 certification programme

Effects              Coordination View 2.0

Date                    2013 09


There are two ways in IFC to express the storey elevation:

    * by IfcBuildingStorey.Elevation

    * by the z-Value of the IfcLocalPlacement of IfcBuildingStorey

It is hereby agreed, that:

    * The value of IfcBuildingStorey.Elevation should be the same as the Z value of the local placement of the IfcBuildingStorey, so they are redundant (or it should be omitted).

    * The Z value of the local placement of the IfcBuildingStorey is the preferred method of locating the building storey and its associated elements

    * The value of the IfcBuildingStorey.Elevation shall not be used within geometric positioning.

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