On 29/05/12 20:16, Tom Chance wrote:
On 29 May 2012 18:52, Chris Hill <[email protected]>
wrote:
My question is: how do you know the boundary aligns with an
existing object?
Aha! A very good point.
I suppose in my case because I've been actively involved in
canvassing for a political party for years in the area, I know
which wards people on different streets live on both from maps
I've seen at some point, the electoral register, talking to
colleagues who are familiar with wards and from going round and
talking to people on the doorstep who know which ward they're in.
With that all in my head and a clear overlap between boundaries
and features in my local area it's pretty easy to get the wards
right. Perhaps that's not really local knowledge and I should
remove the data?
That sounds like local knowledge to me, but your detailed knowledge
is local to you, not shared by many other people contributing to OSM
and can't be used by everyone to know when a road and boundary line
up.
It does raise the question of how worthwhile it is to enter
boundaries where precision is important (e.g. between houses but
not so much in the middle of a rural field) if we have no
copyright-free way of determining exactly where boundaries are.
We have the boundary data provided in OS Open data, which is where
the thread started. It is as close to definitive as we are ever
likely to get.
--
Cheers, Chris
user: chillly
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