Re: [sumo-devel] Support for OSM restrictions

[Daniel K. <d.k...@go...>]

Dear Amie, all,


2010/3/1 Amie Lukas <ami...@go...>

> Dear Developers,
>
> OSM provides support for relations. They can be used to model turning
> restrictions, like "No Left Turn" or "Only Straight On". I tried to add
> support for this feature to SUMO netconvert. I'm already able to parse the
> restrictions, but I'm not quite sure where the right position for handling
> such restrictions would be.
>
> At first glance, NIImporter_OpenStreetMap::insertEdge seemed like a good
> place, however, after some trying this seems not correct, since many
> NBEdges
> have no incoming or outgoing edges in their from- or to-Nodes.
>
>
Why not? Because they have not yet been imported (like an edge is referenced
before being read)? Or because they are prunned?



> What are the alternatives?
>
> 1.) NILoader::load
> 2.) NBNetBuilder::buildLoaded
> 3.) NBNetBuilder::compute
>
> I think "number three" would be a good solution, but I'm not quite sure
> which classes I should adapt to hold the restriction information and the
> method itself (NBEdgeCont?) and what call time would be good to enforce the
> restrictions (before removeDummyEdges?).
>
>
I suppose you should take a look at how this is done when reading
user-defined connections from "native SUMO-XML connection files" - aeh,
those are described at
http://sourceforge.net/apps/mediawiki/sumo/index.php?title=Building_Networks_from_own_XML-descriptions#Connection_Descriptions
.

the class which is used for parsing them is
src/netimport/NIXMLConnectionsHandler. Now, I supose that the import of
OSM-connections should be very similar, because if a "native" connection
outgoing from an edge is read, all other are invalidated, and only the read
ones are used. Ok, there might be a problem if someone wants to prohibit
(remove) a connection to the next edge. In this case, you have to determine
the list of possible edges, first, and then remove the forbidden ones. BTW,
I think that setting connections should be done directly in the OSM
importer, after instantiiating the nodes and edges (before the line "    /*
Clean up */
").

Of course, we would be very happy about getting the modifications so that we
can insert them into the SVN - oh, a test net where they are used would be
nice, too.

sincerely,
Daniel




> I hope you can help me out, since correct treatment of restrictions would
> be
> realy helpful.
>
> Cheers,
> Amie
>
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