Hi Felix,
Can't notice any difference to v1.
OK - thanks.
BTW - Is it possible that there is a difference with the douglas peucker filter whether a road is routable or not?
Yes, looking at the code, it seems that it doesn't change points that are routing nodes so routable ways will be "less smooth" than non-routable ways.
I think it is possible that non routable ways are smoothed heftier than routable ways. This has nothing to do with this patch though, but the difference only seems to become really visible on resolution <20 (maybe resolution 24 is filtered if not routable, but not filtered if routable. Then the more filtering is applied on each successive level, the bigger the difference).
It think the DP filter does nothing at res 24 whether the way is routable or not.
Also I noticed that cgpsmapper maps, seem to have much higher smoothing at lower resolutions compared to mkgmap (using 2.6). At resolution 24 and 22 it seem to be mostly identical though. Maybe we could also increase the douglas peucker severity on resolution <20 compared to right now. Even with very few lines mkgmap maps seem slow on GPS on resolution 16 or 18.
That's worth experimenting with. Perhaps Johann can comment on this, he's the original author of the DP stuff. Cheers, Mark