[Talk-GB] GB boundaries (was "Revert my changeset please")

[SomeoneElse]

Ed Loach wrote:
> I have seen ...  boundaries which follow
> rivers merged with less accurate river ways rather than moving the
> river tags to the relevant section of the boundary way).
>

On that specific question, I've seen plenty of places where an imported 
GB boundary nearly-but-not-quite matches a GPS-, Bing- or OSSV-derived 
river.  I'm guessing that the river's moved since boundary was drawn.

Are inland GB bundaries ever defined in terms of something else (e.g. a 
river or stream) or once defined do they tend to stay where they are or 
move slowly as the river changes course?

When adding streams where boundaries have already been imported I've 
been reluctant to use the boundary way as the stream course because 
there are often clear places where it's not correct.  I wouldn't want to 
alter the location of the boundary way of course, as the boundary itself 
is usually not marked on the ground.

With bigger rivers it's different I guess - the Thames isn't going to be 
allowed to cut through Canary Wharf and create an oxbow lake between 
Greenwich and Millwall any time soon!

Cheers,
Andy