Thanks, this is a great little tool! I’d love to be able to edit the changeset comment before the commit is made, but the auto population of tags changed isn’t a terrible comment – it just doesn’t allow telling of the why.

Thanks for the tip about maptiler.org, Stefan. I’ll have to check out their non-commercial service.

As for a comparison between other services, I haven’t seen one. As far as I can tell, Kurviger is a proprietary service, so I don’t know what algorithm they use for determining the weighting of roads. I haven’t reviewed all of the CartAGen code you linked to, but at least one function is computing the ratio of the distance between start & end points and the length of the road. I had initially investigated that type of algorithm when I first started Curvature and didn’t use it because it has too many cases that give false results, such as very broad circles. See How it works for more details on the Curvature algorithm. I found computing the actual curve radii to be more useful for finding curves a motorcycle would lean into than other ways of determining curviness.

That’s a good point, Jedrzej. I think they are pretty old. According to osm.wiki/Stamen and osm.wiki/Tile_servers there are no or very rare data updates for the Stamen terrain layer.

Unfortunately, I haven’t found a good alternative that is more up to date. I’m open to suggestions, though!