Hi Felix,
Do you see any solution to this problem?
Sorry, I don't have a plan at this time.
I think if a way is shorter than 3.4m we get the problem. I don't think it is because of the duplicate ways.
It's more subtle than that because I could make a small map (just a few 100ms height and width) that included that way and mapsource was quite happy with it but when I processed your big file, it didn't like it - so either the problem is related to the density of stuff around or the size of the area being processed or something...
Could we maybe have a filter that joins such tiny roads to the ones it is connected too?
Well, if it becomes zero length that will happen anyway because that's what the new remove-short-arcs option does. What I could do is extend that code to allow the min distance to be specified so you could say --remove-short-arcs=3.5 and it would zap all arcs under than length but without the distance, i.e. just --remove-short-arcs would only zap zero length arcs. I will produce a patch to do that, should be quick to do. Cheers, Mark