| Re: How to model transitions bends in railML 2.0? [message #241 is a reply to message #240] |
Mon, 07 February 2011 11:43  |
Joachim Rubröder railML
Messages: 0
Registered: November 2019
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Hello Christian,
Christian Rahmig wrote:
> and I am currently working on a
> railML2.0-based representation of a geometrical map of a railway
> network, where I am facing a problem regarding transition bends.
Nice. Who wants to use this map? Does it point to some phase of
construction plans?
> The radiusChange element, which is usually used for geometric modelling
> of the track, is not able to transport all the information defining a
> transition bend. Since there are different options to handle this
> problem - with and without modifying the infrastructure scheme - I want
> to ask everybody in this forum first:
>
> 1. Who else deals with the task of modelling transition bends in railML 2.0?
I must admit, there is currently no possibility to fully define the
cant/superelevation profile in railML. There aren't any transition bends
in railML (despite of the fixed superelevation in arcs).
> 2. If any, what different approaches for transition bend modelling have
> been developed so far?
You can mix railML with LandXML elements. LandXML offers all types of
transition bends, like clothoids, BLOSS and others.
I append a quick and dirty hack, that doesn't fully meat the LandXML
requirements, it lacks the definition of units of measurement at the start
of the file. :-(
You have to correct the XSD pathes in lines 7 and 9 to get it validated.
<?xml version="1.0" encoding="UTF-8"?>
<rail:railml
xmlns:rail="http://www.railml.org/schemas/2009"
xmlns:land="http://www.landxml.org/schema/LandXML-1.2"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.railml.org/schemas/2009
../schema/railML.xsd
http://www.landxml.org/schema/LandXML-1.2
../LandXML/LandXML-1.2.xsd ">
<rail:infrastructure id="i1">
<rail:tracks>
<rail:track id="t1">
<rail:trackTopology>
<rail:trackBegin pos="0" id="tb1">
<rail:openEnd id="oe1"/>
</rail:trackBegin>
<rail:trackEnd pos="2000" id="te1">
<rail:openEnd id="oe2"/>
</rail:trackEnd>
</rail:trackTopology>
<land:CantStation station="1234.56" appliedCant="10"
transitionType="clothoid" curvature="cw"/>
</rail:track>
</rail:tracks>
</rail:infrastructure>
</rail:railml>
Please, let us know, if this approach fulfils your requirements.
Which other approaches did you find out?
Any comments are appreciated.
Kind regards...
Susanne
PS: Couldn't we listen to your project at the next meeting in Innsbruck?
I'm very interested in your work and hope my idea helps out.
--
Susanne Wunsch
Schema Coordinator: railML.common
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