Convert LandXML to IFC 4.3 alignments online — free
To convert a LandXML alignment to IFC 4.3, open IFCraft, drop in the .xml file and export. The horizontal and vertical design becomes a complete IfcAlignment — both the business layout (segments with parameters) and the geometric representation — ready for IFC 4.3 viewers and checkers. Everything runs in your browser; nothing is uploaded.
Open IFCraft — free, no sign-up → Runs in your browser.
How to convert LandXML to IFC step by step
- Export LandXML from your road/rail design software (Civil 3D, OpenRoads, RoadPAC…): horizontal alignment + vertical profile.
- Open IFCraft, create a project with the IFC4x3 ADD2 schema and drop in the .xml file.
- Check the axis. IFCraft builds a segment model of the alignment (lines, arcs, clothoids; gradients and parabolic curves) and shows its stationing.
- Optionally add elements. Combine with a DWG/DXF/3DM file and position products along the axis by station and offset (linear placement), or add stationing referents.
- Export. The IFC contains IfcAlignment with nested horizontal/vertical layouts, terminator segments and — where used — IfcLinearPlacement.
LandXML to IfcAlignment — what ends up in the IFC
| LandXML content | IFC 4.3 result |
|---|---|
| Horizontal alignment (lines, arcs, spirals) | IfcAlignmentHorizontal with typed segments + IfcCompositeCurve geometry |
| Vertical profile (grades, parabolas) | IfcAlignmentVertical + IfcGradientCurve |
| Stationing | IfcReferent points with Pset_Stationing (station values, equations supported) |
| Elements placed on the axis | IfcLinearPlacement (station + lateral/vertical offset) + a readable property set with the same values |
| Coordinates | Real map coordinates (e.g. S-JTSK / EPSG:5514) with IfcMapConversion georeferencing |
FAQ
Does it work with Civil 3D and OpenRoads alignments?
Yes. Any LandXML export works the same way — converting a Civil 3D alignment to IFC or an OpenRoads alignment to IFC is the same drop-and-export flow. Lines, arcs and clothoids are supported horizontally; grades and parabolic curves vertically.
Can I place elements along the alignment?
Yes. Elements from DWG, DXF, 3DM or mesh files can be positioned by station and offset using IfcLinearPlacement — and the station and offsets are also written to a property set, so viewers that ignore placement attributes still show them.
Which IFC schema supports alignments?
IfcAlignment exists in IFC 4.3 (IFC4X3). IFCraft exports the Alignment-based View when linear placement is used, otherwise the Reference View.
My design software exports multiple alignments — are they all read?
Yes, each LandXML alignment becomes its own axis; you choose which ones to include in the export.