[mkgmap-dev] [PATCH v1] Merge road network

Fri Aug 30 07:19:36 BST 2013

Seems to work fine so far (also using maxspeed patch), however I get 
quite a lot of theese (between 0 to 20 per country):
SEVERE (MapBuilder): c:\openmtbmap\maps\64180000.osm.pbf: possible 
routing problem: road end-points not both coordNodes: ((M5), 
http://www.openstreetmap.org/browse/way/152908991)
(serbia from geofabrik). Dunno really what to do with it....

On 27.08.2013 21:31, WanMil wrote:
> mkgmap has a LineMergeFilter but that does not merge the road network.
>
> Attached patch performs a merging in the OSM data just before the road 
> network is created. This has the advantage that the source code for 
> the merging is quite easy. Turn restrictions and through routes are 
> considered.
>
> I tested some data in germany and got a reduction of 5% to 12% (number 
> of roads). I did not find any improvements but also no downgrades in 
> routing. But I did not test long distance routing (> 600km).
>
> I think the merge results can be improved if the access handling and 
> some other parts are moved from source code to the style files. This 
> makes it easier for the merger to say that two roads have the same 
> attributes and can be merged without problems. But that's a task for 
> the future...
>
> I have already uploaded a compiled version: 
> http://files.mkgmap.org.uk/detail/148
>
> For anyone who is interested in the code: Please check the tag list 
> (variable flatCompareTags) in the new RoadMerger. This taglist gives 
> all tags that must be equal so that two roads can be merged. Is this 
> list complete? Can I remove some tags from it?
>
> Have fun!
> WanMil
>
>
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-- 
keep on biking and discovering new trails

Felix
openmtbmap.org & www.velomap.org

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