[Talk-GB] Admin Boundaries and OS OpenData BoundaryLine

woollac at hotmail.com woollac at hotmail.com
Tue May 29 17:58:02 BST 2012


I've been doing a lot of the boundaries in Devon and Somerset, and a lot of the boundaries seem to use streams and rivers.  I therefore use the Centre point of larger rivers.

I've also come across ox bow lakes and such which the boundary does still follow.

Jason  (unieagle)

Connected by MOTOBLUR™

-----Original message-----
From: SomeoneElse <lists at mail.atownsend.org.uk>
To: talk-gb at openstreetmap.org
Sent: Tuesday, 29 May 2012 17:39:03 GMT+01:00
Subject: Re: [Talk-GB] Admin Boundaries and OS OpenData BoundaryLine

Tom Chance wrote:
> 1) Most boundaries follow existing features like roads, rivers, etc.

That raises an interesting question - how is the boundary actually defined?  Is it defined as "the boundary between X and Y is the middle of the river Z", or has someone plotted a series of points P corresponding to the _current_ course of the river and said "the boundary between X and Y is P"?  There are lots of places where boundaries (as shown via OS_OpenData_StreetView) don't quite match rivers any more - have a look up the River Dove from Ashbourne for an example.

If the latter, then clearly the boundary shouldn't share nodes with e.g. rivers.

Cheers,
Andy


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