| Re: <railMLv3> Infra Geometry Terminology [message #2024 is a reply to message #2021] |
Mon, 26 November 2018 16:24   |
christian.rahmig
Messages: 436
Registered: January 2016
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Senior Member |
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Dear Fabrizio,
Am 23.11.2018 um 13:01 schrieb Fabrizio Cosso:
> can someone address me to some documents where I can find
> the exact meaning of terminology used in Geometry View?
> e.g. the exact meaning of each curveType, etc...
I suggest to use the UML model documentation (HTML report, available in
[1]) or the XSD schema documentation (HTML, available in [2]). The
railML 3 wiki, where besides the automatically generated schema
documentation detailed definitions, best practices and open issues shall
be adressed, is still under construction.
Regarding your specific question with the curve type:
Generally, railway alignment knows three basic curves:
* straight lines (constant infinite radius)
* arcs (constant radius)
* transition curves (changing radius)
railML introduces in <horizontalCurve>@curveType some more specific
versions of transition curves, e.g. clothoides, cubic parabolas etc.
Some of these curve types are described in more detail e.g. in [3] or [4].
Once, we start with the use case "Track Geometry" [5], we may have a
closer look on these different types.
Best regards
Christian
[1] https://svn.railml.org/railML3/tags/railML-3.1-rc/doc/model
[2] https://svn.railml.org/railML3/tags/railML-3.1-rc/doc/schema
[3]
https://www.brainkart.com/article/Railway-Engineering-Transi tion-Curve_4227/
[4] https://pwayblog.com/2016/07/03/the-clothoid/
[5] https://wiki.railml.org/index.php?title=UC:IS:Track_Geometry
--
Christian Rahmig - Infrastructure scheme coordinator
railML.org (Registry of Associations: VR 5750)
Phone Coordinator: +49 173 2714509; railML.org: +49 351 47582911
Altplauen 19h; 01187 Dresden; Germany www.railml.org
Christian Rahmig – Infrastructure scheme coordinator
railML.org (Registry of Associations: VR 5750)
Altplauen 19h; 01187 Dresden; Germany www.railML.org
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