[OSM-talk] administrative boundaries and is_in

[Lester Caine]

Abigail Brady wrote:
> On Jan 10, 2008 11:06 AM, Lester Caine <lester at lsces.co.uk 
> <mailto:lester at lsces.co.uk>> wrote:
> 
>     Stephen Gower wrote:
>      > On Thu, Jan 10, 2008 at 10:11:35PM +1300, Robin Paulson wrote:
>      >> the boundary data should be relatively easy to come by
>      >
>      >   Not where it isn't marked on the ground, and is only defined by
>      >   reference to the Copyrighted national mapping.  The is the case in
>      >   many places in the UK.
> 
>     AND it is changed each year or so by the Boundary Commission :)
> 
> 
> Administrative boundary changes (as opposed to electoral ones) are in 
> fact relatively rare and usually make boundaries follow more easily 
> identified features (for example, the external border of Greater London 
> in many places now follows the M25, as opposed to the line of nearby 
> ancient hedges which may or not be there any more).

You are almost right for the bigger administrative areas, but parish and ward 
boundaries are regularly on the move. I'm just working out how to handle a 
couple of changes in other work I'm doing :(

-- 
Lester Caine - G8HFL
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