[OSM-newbies] Ungluing in Potlatch

[Thomas Meller]

OK, no politics, for me.
I used both, potlatch as well as josm and found both tools difficult to understand at this task.
Once you now how, everything is easy.

Explanation for Potlatch (haven't used it for a long time):

Cut the polygon at a point apart from the road, but the first next to it.
activate the endpoint by clicking on it (have a look on the direction indicator to find the direction you will delete points)
push <BCKSPC> to delete all 'invalid' points from that polygon
draw new points near the original locations
shiftclick the point you split the polygon, which will close the loop again

You won't alter the points at all. OSM's model is that a point is an object by itself. It's membership to a way is just a numbered link, by which the way's shape is formed along the ordered list of points. All Object-IDs of the points forming the road in question won't change, only the new points forming the shape of the polygon will create new objects.

Some time ago, potlatch created multiple ways containing the same points one over the other - which was invisible and could only be cleaned up using the above description.
I had lots of these.

Good luck and joy on editing
Thomas

-------- Original-Nachricht --------
> Datum: Mon, 11 Jan 2010 13:28:11 +0000 (GMT Standard Time)
> Von: "Molescott" <waywalker at btinternet.com>
> An: newbies at openstreetmap.org
> Betreff: [OSM-newbies] Ungluing in Potlatch

> Until I'm more experienced and confident with JOSM, I mostly use Potlatch
> but don't know how to separate landuse - road - landuse where they share
> common nodes.
> 
> I can do it in JOSM but as I'm mainly in Potlatch I've been darting
> between
> the two just to separate areas, which seems a bit silly.
> 
> Regards,  Pete.

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