How to Export Civil 3D Data to LandXML
To export Civil 3D data to LandXML, type LANDXMLOUT at the command line, pick which objects to include (surfaces, alignments, parcels, pipe networks, survey), choose a file, and OK. The resulting .xml is portable to any application that reads LandXML — Trimble, Leica, Bentley, machine-control systems.
Steps
Run LANDXMLOUT
Type LANDXMLOUT (or use the Toolspace Toolbox → Miscellaneous Utilities → LandXML Export). The Export to LandXML dialog opens.
Pick objects to export
Tick alignments, profiles, surfaces, parcels, pipe networks, pressure networks, or survey data as needed. By default everything is selected — uncheck what you don't need to keep the file small.
Configure version and settings
Pick the LandXML version (1.2 is the most widely supported; 2.0 supports more pipe network attributes). Confirm the output filename and click OK.
Validate the file
Open the .xml in a text editor — LandXML is human-readable. Quick sanity check: search for <Alignment, <Surface, <PipeNetwork to confirm what you expected is in there.
Round-trip if needed
To import LandXML back in (or into another Civil 3D), use LANDXMLIN. Round-tripping is the standard way to move design data between Civil 3D and any other engineering software.
Frequently asked questions
My surface exported but it's missing breaklines.
Breaklines are exported only if you enable 'Export TIN as Definition' in the dialog. If only the final TIN is exported, the receiving software will see triangles but not the source breaklines.
Which LandXML version should I pick?
1.2 for maximum compatibility (every reader supports it). 2.0 if both ends are modern and you need richer pipe network or pressure network attributes.
Can I export only one alignment?
Yes — in the LandXML Export dialog, click the alignment in the tree and untick the others. Or pre-filter in Prospector by removing items from your selection set.
Will the receiving software see Civil 3D's design intelligence?
No. LandXML is geometry + properties only. Corridors, intersection logic, and dynamic relationships are flattened during export. The receiving software sees the resulting alignments, surfaces, profiles — not the rules that built them.
Related guides
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