[Talk-GB] Snowdonia National Park Boundary

[David Woolley]

On 29/05/15 00:46, Colin Smale wrote:
> Thanks to the people who pointed me at helpful tools. I have fixed it up
> as best as I can for the moment - obviously erroneous stretches of
> coastline have been removed, missing segments have been added where a
> bridge has been inserted, that kind of thing. Geometrically it looks OK,
> and it seems very roughly to correspond to the illustrative map on
> Wikipedia.

There are ways of reversing changes exactly, but they are difficult to 
use if there have been ad hoc attempts to repair in the mean time, as 
you have to reverse those repairs first and you need to distinguish them 
from legitimate changes that happened to overlap.