Import and Export LandXML Data

XPSWMM can import and export pipe networks (nodes and links and associated data) and TINs in LandXML format.

Import LandXML Data

To import LandXML data into a project, go to File > Import/Export Data > Import LandXML. In the Windows Explorer window that opens, navigate to the .xml file and then click Open.

If you are using the 32-bit engine and you try to import more than 2 million surface points, the application will display a warning message that says "Import failed: LandXML Surface should contain less than 2 million surface points."

If you are using the 64-bit engine, no warning will be shown. The import will proceed and a message will display showing the location of the imported .xml file.

Export LandXML Data

The features that are supported during export of an XPSWMM project to LandXML are the same features which can be imported from LandXML into an XPSWMM project.

To export a LandXML data, go to File > Import/Export Data > Export LandXML. Navigate to the folder where you want to export the file, provide a filename, and then click Save.

If you try to export only one node, the application will display an error message that says "Pipe network validation failed: Please make sure that you have at least 2 nodes with both of them connected to a link."

NODES (structs in LandXML)

The nodes are exported to the LandXML file as circular structures. Properties that are exported are as follows:

XPSWMM property	LandXML property	Description
Ground Elevation (Spill Crest)	ElevRim
Invert Elevation	ElevSump
Diameter	Diameter	Calculated from the Area
Name (Label)	Name
Location (X, Y)	Center
Down Stream Invert Elevation	FlowDir (In)	Connected Link
Up Stream Invert Elevation	FlowDir (Out)	Connected Link
Elevation	elev	Connected Link

Links (Conduits)

The links are exported to a LandXml file only as circular, egg, rectangular, ellipse, and trapezoidal. Natural Channels are exported as trapezoidal as well. This is because LandXML does not support natural channels in the same fashion as xp. All other conduit types are exported as circular. Properties that are exported are as follows:

XPSWMM property	LandXML property	Description
Name	Name
Description	Desc
Downstream node	RefEnd
Upstream node	RefStart
Length	Length
Slope	Slope
Mannings	Mannings

Circular Link

XPSWMM property	LandXML property	Description
Diameter	Diameter

Egg Link

XPSWMM property	LandXML property	Description
Height (Diameter)	Height
Span	Span	Calculated: Diameter/1.5

Rectangular Link

XPSWMM property	LandXML property	Description
Height	Height
Width	Width

Ellipse Link (Horizontal/Vertical)

XPSWMM property	LandXML property	Description
Height (Diameter)	Height
Span	Span	Calculated: Diameter/1.6

Trapezoidal Link

XPSWMM property	LandXML property	Description
Height (Diameter)	Height
Width	Bottom width
Width, Theta and Phi	Top width	Width + Theta + Phi

Natural channel

XPSWMM property	LandXML property	Description
Height (Diameter)	Height
Width	Bottom width
Width, XNLen_L, XNLen_R	Top width	Width + XNLen_L + XNLen_R

TINs (Surfaces)

Multiple TIN’s can also be exported as LandXML.

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