<html><head><style type="text/css">body {word-wrap: break-word; background-color:#ffffff;}</style></head><body><div style="font-family: sans-serif; font-size: 16px">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.<br><br>I've also come across ox bow lakes and such which the boundary does still follow.<br><br>Jason (unieagle)<br><br><font color="#333333"><i><span style="font-size: 14px"><font face="sans-serif">Connected by MOTOBLUR™</font></span></i></font></div><br><br>-----Original message-----<br><blockquote style="; border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><div style="font-family: sans-serif; font-size: 14px"><b>From: </b>SomeoneElse <lists@mail.atownsend.org.uk><b><br>To: </b>talk-gb@openstreetmap.org<b><br>Sent: </b>Tuesday, 29 May 2012 17:39:03 GMT+01:00<b><br>Subject: </b>Re: [Talk-GB] Admin Boundaries and OS OpenData BoundaryLine<br><br></div>Tom Chance wrote:<br>> 1) Most boundaries follow existing features like roads, rivers, etc.<br><br>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.<br><br>If the latter, then clearly the boundary shouldn't share nodes with e.g. rivers.<br><br>Cheers,<br>Andy<br><br><br>_______________________________________________<br>Talk-GB mailing list<br>Talk-GB@openstreetmap.org<br><a href="http://lists.openstreetmap.org/listinfo/talk-gb">http://lists.openstreetmap.org/listinfo/talk-gb</a><br></blockquote></body></html>