> Date: Wed, 27 Aug 2008 17:59:37 +0100 > From: "David Groom" <[EMAIL PROTECTED]> > Subject: [OSM-talk] Potlatch & duplicated node > To: <[email protected]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; format=flowed; charset="iso-8859-1"; > reply-type=original > > Whilst reviewing data I've noted recently a large number of duplicated > nodes. These occur where one way joins another. > > I've managed to create a few myself, but have noted that many other users > are doing the same. In each instance the relevant ways have "created by > Potlatch" as tags. > > I presume that : > > (1) Either there must be a bug in Potlatch > (2) Its far too easy for a user to inadvertently create duplicated nodes. > > Take for example the area > http://www.openstreetmap.org/index.html?mlat=13.166319744096374&mlon=- > 61.239985647460315&zoom=12 > . The validator in JOSM reports 176 duplicated nodes. > > Same area as shown on informationfreeway > http://www.informationfreeway.org/?lat=13.153544792952308&lon=- > 61.222993541715226&zoom=15&layers=0000T0B0F > > I would stress I'm not blaming the users who created the data in that > area. > I count myself as a fairly experienced OSM mapper, and as I stated earlier > I > have been managing to create some duplicated nodes, and that's even after > reading and re-reading the Potlatch editing FAQ. > > If its not a bug in Potlatch, then could the program be changed so that it > is much harder to duplicate nodes. > Also, when manipulating ways which are parts of relations it seems to be possible to break the Potlatch/Server link and end up with duplicate ways. I think the best way to do this is to split and join and delete ways which is part of a relation. I haven't worked it through in detail to understand exactly what is happening and give the repeatable formula but could do if that was useful if others haven't already done this.
Sometimes I find I have a way which is part of a relationship which refuses to die. If I remove all the nodes except for two, then remove the relationship and all the tags then it I seem to be able to delete the last two. Finally, a question. If I have a pair of ways on top of each other (the edge of a park and a road for example that share nodes; is there any way to select the way I am actually interested in rather than just the one that is 'on top'? Regards PeterIto _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
