CV-2x3-182

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

Description:

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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