[Talk-GB] Admin Boundaries and OS OpenData BoundaryLine

[Tom Chance]

On 29 May 2012 15:44, Colin Smale <colin.smale at xs4all.nl> wrote:

> My questions to the community:
> 1) Would a bulk upload of any or all of this data be interesting?
>

Thanks for raising this, it would be great to get a more complete set of
boundaries. In answer to your first question, no, please don't follow a
bulk upload approach. I say this for two reasons:

1) Most boundaries follow existing features like roads, rivers, etc. They
need to be manually entered as relations sharing nodes with those features.
In my experience this is often a nice opportunity to spot other problems
with very old features using aerial imagery and GPS tracks, e.g. poor
alignment, or complicated junctions that aren't fully modelled for routing.
So much better done manually than by dumping a load of new ways into the
database.

2) Many boundaries already exist, but are often slightly incorrect, e.g.
not sharing nodes with existing features but being a little offset. By
doing this manually you can improve these as you go, especially since every
boundary shares its properties with one or more other boundaries.

The best approach would be to identify which boundaries are missing, put
those up in a list and and encourage people to get us to 100%. Perhaps
start with counties, then unitaries and districts, then even wards.

ITO have a nice map of boundaries that people can use to check up on them,
you can see I started to add wards in Southwark:
http://www.itoworld.com/map/2

Regards,
Tom

-- 
http://tom.acrewoods.net   http://twitter.com/tom_chance
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