[mkgmap-dev] Routing issue

Tue Oct 13 09:10:32 BST 2009

Marko Mäkelä escribió:
> On Tue, Oct 13, 2009 at 09:22:33AM +0200, Carlos Dávila wrote:
>   
>> I would like to know what's the effect of duplicate nodes on rutting. 
>> Some areas of Spain are full of them (I have already fixed more than 
>> 60.000 in the Northwest).
>>     
>
> I think that it was mentioned a few weeks ago when discussing the
> creation of bidirectional cycleways on oneway streets:
> Only ways that share nodes are connected.  That is, routing will not
> work over duplicate nodes (unless both ways happen to be connected
> to one of the duplicate nodes, of course).
>
> It is not that hard to fix duplicate nodes.  In JOSM, find them with
> the Validator plugin.  Double-click a duplicate node warning in the
> validator error list and hit 3 to center the map at the nodes, so that
> you can check what to do.  Then hit M to merge the nodes, unless it
> is something else (tunnel or bridge needed, for instance).
It's not so easy when josm finds thousands of duplicate nodes, even 
fixing them automatically  with the validator and also if  there's also 
duplicated ways. You have to fix first duplicated ways, but if some of 
them are members of any relations, things became more and more complicated.
Carlos