About Supported LandXML Data for Import and Export

LandXML supports Autodesk Civil 3D drawing data for import and export.

General Data Handling

All coordinate locations are always treated as Northing, Easting, Level (or Y,X,Z).

All chainage values are treated as the actual measured distance along the alignment or geometry. Chainage equations are always imported or exported (if they are defined) with alignment data. However, they are not applied to any geometric chainage locations in the data; they are used only for display and reporting purposes.

Point references to pointType derived locations <CgPoint pntRef="100"/> are supported. The supported references include: CgPoint, Start, Center, End, Monument, and CrossSectPnt elements. For more information, see About Exporting Point References to LandXML.

LandXML Elements Supported for Drawing Import

Note: You can specify your preference for handling duplicate data under Conflict Resolution Settings on the Import tab of the LandXML Settings dialog box.

LandXML Element Supported	Notes
Units
Application
Author
CoordinateSystem	Uses Map Zone name/European Petroleum Survey Group (EPSG) name.
CgPoints	Supports multiple elements. If <CgPoints> is named, a corresponding point group is created and COGO points are added.
CgPoint	Imports a COGO point and uses name and desc or code attributes. Number is auto-assigned if name is alpha-numeric, but name is maintained.
Alignments
CoordGeom	Lines, curves, transitions, and irregular lines.
AlignPIs
Cant
StaEquation
Superelevation
Profiles	Finished ground, design profiles created using imported lines (VIPs), circular vertical curves, parabolic, symmetric, and asymmetric vertical curves.
Profile.ProfSurf	VIP, pointlist data for a sampled ground surface.
Profile.ProfAlign	All elements are supported.
Plots	Creates plots from data.
CoordGeom	All elements are supported.
Monuments	Creates COGO points in a monuments points group.
Surfaces
SourceData
Breaklines	Imported on layer "<surfacename>_Breaklines" as either 3D polylines or feature lines based on the LandXML settings.
Contours	Imported as 3D polylines on layer "<surfacename>_Contours".
DataPnts	Imported as COGO point group named "<surfacename>_DataPoints" on layer "<surfacename>_DataPoints".
Definition
Triangulation	Option to import faces, then either update triangulation or maintain the triangulation in the file. Supports face edge visibility and face neighbor optimization attributes.
GRID
Survey
ReducedObservations	Creates COGO points in an observations point group. Important: Using the Import LandXML command from the File menu does not import survey data into the survey database. For more information, see To Import Survey XML Data.
SurveyMonuments	Creates COGO points in a monuments point group.
PlanFeatures	Imported to the current layer as either 3D polylines or feature lines according to the code and source attributes of the PlanFeature Feature element.
PlanFeature
CoordGeom	Lines and curves.
Feature	Creates feature lines if the required code and source attributes are present.
PipeNetworks	Each <Pipe Network> is imported as a Autodesk Civil 3D pipe network.
Pipe	Supports curved pipe.
Units.diameterUnit
Structs
Units.diameterUnit
PipeFlow
StructFlow

Supported LandXML Elements for Drawing Export

LandXML Element Supported	Notes
Units	Always exported.
Application	Always exported.
Author
CoordinateSystem	Uses Map Zone name/European Petroleum Survey Group (EPSG) name.
CgPoints	Point group exports as <CgPoints> with matching name and all points export. If an Autodesk Civil 3D point has a point name, the name is exported to the LandXML point name attribute. Otherwise, the point number is exported to the LandXML point name attribute.
Alignments
CoordGeom	As lines, curves, and transitions.
AlignPIs
Cant
StaEquation
Superelevation
Profiles
Profile.ProfSurf
Profile.ProfAlign	Design profiles with lines, circular vertical curves, parabolic, symmetric, and asymmetric vertical curves.
Plots
CoordGeom	As lines, curves, and transitions.
Surfaces	Triangulation, GRID, and volume surfaces exported.
SourceData
Breaklines
Contours
DataPnts
Definition
Triangulation
GRID
Carriageways	Corridors exported as <Carriageways> with references to <Alignments> with Profiles and Cross Sections (both sampled ground and design sections) and to one or more reference surfaces.
PipeNetworks
Pipes
Units.diameterUnit
Structs
Units.diameterUnit
PipeFlow
StructFlow
PlanFeatures
PlanFeature	Used for 3D polylines and feature lines.
CoordGeom	As lines or curves.
Feature	Uses code and source attributes to specify a feature line. The code attribute varies depending on the type of feature line to export. A PlanFeature without a Feature or a PlanFeature with a Feature but without the code and source attributes is treated as a 3D polyline.