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 |
8.18.3.7.4 Formal representation
ENTITY IfcMapConversionScaled
SUBTYPE OF (IfcMapConversion);
ScaleX : IfcReal;
ScaleY : IfcReal;
ScaleZ : IfcReal;
END_ENTITY;