XPSWMM can import and export pipe networks (nodes and links and associated data) and TINs in LandXML format.
This page contains the following topics:
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.
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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Import and Export External Databases
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Import HEC-RAS Data