[OSM-newbies] Fun with duplicate nodes

[Alan Mintz]

At 2010-02-10 02:11, Richard Fairhurst wrote:
>I've just added a bunch of dupe-fixing features to Potlatch. So when
>you've used Matt's map to identify some dupes, click 'Edit in
>Potlatch' and sign in as per usual...

If I might inject a note of caution...

It may not always be correct to join nodes that are in the same place. In 
particular, I find it difficult to edit highways that share nodes with 
landuse=* and boundary=* ways. There are many other situations that are 
even more coincidental, where nodes that are used to approximate curves 
happen to fall near other nodes that belong to an unrelated feature.

One situation I see a lot where it _is_ useful is where a node exists on a 
railway that is very close to a node on a highway that crosses it, and the 
two should be merged into one node, tagged railway=level_crossing. Be 
careful to look at the imagery, though, to verify that they actually 
connect at-grade instead of one of them needing to be a bridge or tunnel.


--
Alan Mintz <Alan_Mintz+OSM at Earthlink.net>