Road Curve Mapping Tips

Posted by Xvtn on 24 May 2023 in English (English).

Don’t Overdo It

Use as few nodes as possible, but as many as necessary. This makes it much easier for later mappers to improve or update things.


Keep Consistent Distance Between Nodes

Makes rendered maps look much nicer :)


Follow Road’s Centerline

Center it

Do you disagree? Any other tips? Leave a comment.

Comment from nickjohnston on 25 May 2023 at 16:59

I broadly agree, but would like to point out that for those willing to use JOSM, UtilsPlugin2 provides the very useful Circle Arc tool. I use it a lot.

I like iD. Without it I most likely would have never started editing OpenStreetMap. But I advise people to learn JOSM. The investment will soon pay back.

Comment from Xvtn on 25 May 2023 at 17:15

Great tip! It seems there’s a JOSM plugin for everything. Obviously it’s the more powerful option for editing, but after trying to get used to it several times I can’t seem to get over that initial wall of unfamiliarity. I suppose one of these days I should make myself switch over and reap some of the benefits you describe…

Comment from philippec on 26 May 2023 at 09:40

If you have an official map, maybe the official centerline is the best.

Comment from Exe19 on 29 May 2023 at 09:44

I’d add a sub-point to “Keep Consistent Distance Between Nodes”: node spacing should be proportional to curvature:

  • If the curve is tight segments should be shorter,
  • if it’s gentle they should be longer and
  • if the segment is straight as laser beam then it should have no intermediate nodes unless something else requires it

That way the angular spacing is more consistent and we use nodes where they are the most useful.

Comment from philippec on 29 May 2023 at 09:47

I hate when the map in my region has a childish look.

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