# WorldCoordinateSystem, IfcMapConversion and IfcSite

**URL:** <https://forums.buildingsmart.org/t/worldcoordinatesystem-ifcmapconversion-and-ifcsite/1924>\
**Category:** Developers\
**Tags:** ifc4, ifc4-errata\
**Created:** [October 18, 2019, 12:59pm UTC](https://forums.buildingsmart.org/t/worldcoordinatesystem-ifcmapconversion-and-ifcsite/1924 "2019-10-18T12:59:08Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![ReD\_CoDE](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.buildingsmart.org/red_code/32/226_2.png) [@ReD\_CoDE](https://forums.buildingsmart.org/u/ReD_CoDE)\
**Post date:** [October 19, 2019, 10:38am UTC](https://forums.buildingsmart.org/t/worldcoordinatesystem-ifcmapconversion-and-ifcsite/1924/4 "2019-10-19T10:38:00Z")

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Also take a look at this post:

> [@Coordinates of the IfcLocalPlacement/IfcCartesianPoint](https://forums.buildingsmart.org/t/coordinates-of-the-ifclocalplacement-ifccartesianpoint/1809):
>
> do you know what is best practice on defining the coordinates of components in the IFC Structure, respectively the IfcLocalPlacement/IfcCartesianPoint? Depending whether the component sits near the Project Zero Point the values appearing in the IfcCartesianPoint will be in a range of some tens of meters. When the model georeferenced acording to a local datum, the component sits in the BIM Authoring tool far away from the Project Zero Point resulting in coordinates rangin in thousends/millions. …

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_[View the full topic](https://forums.buildingsmart.org/t/worldcoordinatesystem-ifcmapconversion-and-ifcsite/1924)._