On 19 Jul 2009, at 11:54, Chris Hill wrote:
Peter Reed wrote:
Of the authorities I have managed to measure, the following all
show more road mapped than the DfT believes exists:
Having mapped every road in Hull (Kingston-upon-Hull since today is
a Sunday), some are fairly new and may not appear on the DfT
figures. How did you account for dual carriageways? If you counted
both carriageways and DfT only counted the road once that might
account for some the difference. Some of the dual carriageways in
Hull use the dual_carriageway relation, though not all - I confess
that I gave up adding it when it seemed to be completely unused.
Firstly can I say thank you Peter! This is a great example of how OSM
progresses with people popping up with new ideas and innovations where
the first you hear of it is when the person has done it. I agree that
dual carriageways are a potential source of over-counting. non-adopted
roads might be another. Are you clipping roads at the boundary yet? If
not there you may be including road sections that are only partly in
the county.
With regard to dual-carriageway relations, I think it is only a matter
of time before they are taken up and then there will be a rush to add
more as with the cycle routes and OpenCycleMap. I have added relations
for dual-carriageways in my area as well.
Could you publish a table of authority boundaries in the UK, their
name, their admin-level and if you consider them to be complete or
not? There are various manual boundary checks but none of them seem to
work all the time and some say things are ok when other ones don't. We
still don't understand why Hampshire is not recognised by Geofabrik
boundaries viewer for example.
I added some more boundaries to the England page today (ie some more I
found on the map rather than ones that I added).
http://wiki.openstreetmap.org/wiki/WikiProject_England
Btw, are people ok if I go through the existing ceremonial boundaries
(the ones that are only ceremonial and not administrative) and change
there tagging to boundary-ceremonial (rather than
boundary=administrative)?
A final point. How does one create relations containing relations?
There is a relation for 'London Boroughs'. I wondered if we should
produced one for 'Regions of England', and 'ceremonial counties of
England' and add the appropriate relations to them.
Here is the 'London Boroughs' relation as an example. I like the map
that is produced from it.
http://www.openstreetmap.org/browse/relation/51908
Regards,
Peter
Cheers, Chris
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