IFC 4.3.1.0 (IFC4X3_ADD1) development

8.18.3.7 IfcMapConversionScaled

8.18.3.7.1 Semantic definition

An IfcMapConversionScaled is a type of IfcMapConversion that along with an EPSG code supplies a constant scale factor for coordinate conversion. The usage is restricted to when constant scale factors are explicitly exchanged. Typically, these are relatively speaking smaller facilities such as buildings where a constant scale factor is agreed on a project.

8.18.3.7.2 Entity inheritance

8.18.3.7.3 Attributes

# Attribute Type Description
IfcCoordinateOperation (2)
1 SourceCRS IfcCoordinateReferenceSystemSelect

Source coordinate reference system for the operation.

2 TargetCRS IfcCoordinateReferenceSystem

Target coordinate reference system for the operation.

IfcMapConversion (6)
3 Eastings IfcLengthMeasure

Specifies the location along the easting of the coordinate system of the target map coordinate reference system.

4 Northings IfcLengthMeasure

Specifies the location along the northing of the coordinate system of the target map coordinate reference system.

5 OrthogonalHeight IfcLengthMeasure

Orthogonal height relative to the vertical datum specified.

6 XAxisAbscissa OPTIONAL IfcReal

Specifies the value along the easting axis of the end point of a vector indicating the position of the local x axis of the engineering coordinate reference system.

7 XAxisOrdinate OPTIONAL IfcReal

Specifies the value along the northing axis of the end point of a vector indicating the position of the local x axis of the engineering coordinate reference system.

XAxisAbscissa it provides the direction of the local x axis within the horizontal plane of the map coordinate system.

8 Scale OPTIONAL IfcReal

Scale to be used, when the units of the CRS are not identical to the units of the engineering coordinate system. If omitted, the value of 1.0 is assumed.

Click to show 8 hidden inherited attributes Click to hide 8 inherited attributes
IfcMapConversionScaled (3)
9 ScaleX IfcReal

Scale X by which the length measures in local engineering CS have to be multiplied to get map coordinates

10 ScaleY IfcReal

Scale Y by which the length measures in local engineering CS have to be multiplied to get map coordinates

11 ScaleZ IfcReal

Scale Z by which the length measures in local engineering CS have to be multiplied to get map coordinates

Table 8.18.3.7.A

8.18.3.7.4 Formal representation

ENTITY IfcMapConversionScaled
 SUBTYPE OF (IfcMapConversion);
	ScaleX : IfcReal;
	ScaleY : IfcReal;
	ScaleZ : IfcReal;
END_ENTITY;

8.18.3.7.5 References

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8.18.3.7.6 Changelog

8.18.3.7.6.1 IFC4.3_DEV_9f90c1f0

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