IFC 4.3.0.1 (IFC4X3) development

# 8.18.3.5 IfcMapConversion

## 8.18.3.5.1 Semantic definition

The map conversion deals with transforming the local engineering coordinate system, often called world coordinate system, into the coordinate reference system of the underlying map.

The map conversion allows to convert the local origin of the local engineering coordinate system to its place within a map (easting, northing, orthogonal height) and to rotate the x-axis of the local engineering coordinate system within the horizontal (easting/westing) plane of the map.

The scale factor can be used when the length unit for the 3 axes of the map coordinate system are not identical with the length unit established for this project (see IfcProject.UnitsInContext), if omitted, the scale factor 1.0 is assumed.

## 8.18.3.5.5 Formal representation

ENTITY IfcMapConversion
SUBTYPE OF (IfcCoordinateOperation);
Eastings : IfcLengthMeasure;
Northings : IfcLengthMeasure;
OrthogonalHeight : IfcLengthMeasure;
XAxisAbscissa : OPTIONAL IfcReal;
XAxisOrdinate : OPTIONAL IfcReal;
Scale : OPTIONAL IfcReal;
ScaleY : OPTIONAL IfcReal;
ScaleZ : OPTIONAL IfcReal;
END_ENTITY;

## 8.18.3.5.6 References

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### 8.18.3.5.7 Changelog

• New resource
• attribute, ScaleY
• attribute, ScaleZ