[mkgmap-dev] errors in routing

Mon Aug 3 02:21:58 BST 2009

Quoting Mark Burton <markb at ordern.com>:

>
>> Should now be fixed.
>
> Err, that's only for OSM input.
>
> For Polish input it's not fixed - you have to fix your data instead.
> Just make sure that no road is longer than 25Km between nodes. If
> necessary, add extra nodes.
>
> I don't know what the distance constraint is here but with your sample
> data, I limited the length of the way to 25Km and the problem went
> away.
>
> Cheers,
>
> Mark

Thanks for your work on this, I will test it on the full map at lunch  
time or tonight. The problem is most evident when highways are added  
to otherwise blank sections of the map. I checked the entire map of  
the Netherlands yesterday to understand why others had not reported  
the problem and I found that all the road segments are short, so the  
problem did not show up.

I may be able to use mkgmap to fix my road data automatically in a  
once-off conversion, mp->osm->img->mp. I will need to check each step  
to make sure nothing is lost.

Garvan