[mkgmap-dev] Error - zero length arc

Sun Jul 26 23:47:53 BST 2009

Hi Rudi,

> I have a problem with a zero length arc (mkgmap 1107):
> 
> SCHWERWIEGEND (RoadNetwork): Road null (OSM id 34881225) contains zero
> length arc
> SCHWERWIEGEND (RoadNetwork):
> http://www.openstreetmap.org/?lat=47.83413&lon=11.70958&zoom=17
> 
> This is a strange railway=platform. It is mapped like a very narrow 'area'.
> I have set the flag --remove-short-arcs and this road is also not on a tile
> border. (I tried the same area with mkgmap 1092 and the map was created
> without an error message.)
> 
> Is there a problem with the remove-short-arcs algorithm?
> (I can change the OSM data but I'd prefer to have an mkgmap version without
> error message for this kind of way).

Something that's bugging me about this example is that it's a railway
platform and shouldn't be routable anyway. Have you styled it into a
highway of some kind? If so, that could be the root of the problem.

Anyway, I can't think any more tonight, I'll look again in the morning.

Cheers,

Mark