Hi there,
I tried to understand how Revit exports the geographic reference to ifc.
I figured out that EPSG Code, Description, Geodetic Datum, Easting, Northings, Elevation and Angle from True North is exported quite easy.
I couldn't find any option to define:
- IfcProjectedCRS.VerticalDatum
- IfcProjectedCRS.MapProjection
- IfcProjectedCRS.MapZone
- IfcProjectedCRS.MapUnit
- IfcMapConversion.SourceCRS
- IfcMapConversion.TargetCRS
- IfcMapConversion.XAxisAbscissa
- IfcMapConversion.XAxisOrdinate
- IfcMapConversion.Scale
Is there by chance an option included in Revit to define these options?
Also I find i really akward, that the IfcMapConversion by 8 Attribute inheritance, but Revit exports 10?
And the the ifcdirection is exported as 6.1230317691118863E-17 also if the Orientation is 0.?
Actually also the Northings is exported as 106900.xxx-xxxxxxxx; I just removed the rest so it is more clear.
In Archicad it seems quite straight-forward.
Hello.
I think you should check these out so you get a better understanding how it works in Revit:
https://github.com/Autodesk/revit-ifc/issues/255
https://gopherproxy.meulie.net/thinkmoult.com/1/ifc-coordinate-reference-systems-and-revit
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