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, Elevation (or Y,X,Z).

All station values are treated as the actual measured distance along the alignment or geometry. Station equations are always imported or exported (if they are defined) with alignment data. However, they are not applied to any geometric station 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, spirals, and irregular lines.

AlignPIs

 

Cant

StaEquation

 

Superelevation

 

Profiles

Finished ground, design profiles created using imported lines (PVIs), circular vertical curves, parabolic, symmetric, and asymmetric vertical curves.

Profile.ProfSurf

PVI, pointlist data for a sampled ground surface.

Profile.ProfAlign

All elements are supported.

Parcels

Creates parcels 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

 

TIN

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 spirals.

AlignPIs

 

Cant

StaEquation

 

Superelevation

 

Profiles

 

Profile.ProfSurf

 

Profile.ProfAlign

Design profiles with lines, circular vertical curves, parabolic, symmetric, and asymmetric vertical curves.

Parcels

 

CoordGeom

As lines, curves, and spirals.

Surfaces

TIN, GRID, and volume surfaces exported.

SourceData

 

Breaklines

 

Contours

 

DataPnts

 

Definition

 

TIN

 

GRID

 

Roadways

Corridors exported as <Roadways> 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.