OpenStreetMap
I have now traced the River Clun on NPE from Clunton to the Shropshire/Herefordshire border. Part of the south-east corner of that border follows the River Clun. Therefore, I could move the border to incorporate the river, but the NPE is not perfect and I don't want to mess up the border if the data source of the current boundary more accurate. Any advice?
Discussion
Comment from chillly on 10 July 2009 at 19:39
Look at the history of the border way (press H in potlatch) then contact the person who drew the current border with a send message to see what they think.
Comment from SK53 on 10 July 2009 at 22:24
I'd always be cautious about borders on or close to rivers. Usually the border will have been statically defined but the river will keep changing. It's best to have two separate ways preferably not sharing nodes. If the border was a relation then adding the river as a member is a reasonable approach.
I presume the tracing is done in Potlatch: I've never found it that easy to create two ways very close (or overlying each other) in Potlatch. I can think of two approaches using Potlatch: 1) lay out the way with nodes which are not quite in the right place: later drag them to their correct positions (the ways are not then joined); 2) split the current boundary way and delete the portion which is in the way - draw the river - use history to revert to the way you deleted. If you use JOSM you can copy a portion of the boundary, paste it into a new layer, realign it properly, change its tags and then merge the layers. This is appropriate if the river and boundary are pretty closely aligned. HTH.
Comment from davespod on 13 July 2009 at 06:11
Thanks, that's helpful.