About Supported LandXML Data for Import and Export

LandXML supports AutoCAD 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.
AlignPI
StaEq
Superelevation
DesignSpeeds
Profiles	Finished ground, design profiles created using imported lines (PVIs), circular vertical curves, parabolic, symmetric, and asymmetric vertical curves.
ProfAlign	All elements supported
ProfSurf	PVI, pointlist data for a sampled ground surface
CrossSects
CrossSectSurf	As sample lines in sample line group associated with alignment
DesignCrossSectSurf	As subassembly
Parcels	Creates parcels from data
CoordGeom	All elements supported
Monuments	Creates COGO points in a monuments points group
Surfaces
SourceData
Breaklines	Imported as 3D polylines on layer "<surfacename>_Breaklines"
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
CoordGeom	Imported as 3D polylines to current layer
PipeNetworks	Each <Pipe Network> is imported as a AutoCAD 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 AutoCAD 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.
AlignPI
StaEq
Superelevation
DesignSpeeds
Profiles
ProfAlign	Design profiles with lines, circular vertical curves, parabolic, symmetric, and asymmetric vertical curves.
ProfSurf
CrossSects
CrossSectSurf	Sample lines exported as CrossSectSurfs
DesignCrossSectSurf	Assemblies exported as DesignCrossSectSurfs
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