On 02/08/2010 22:15, Richard Moss wrote:
On 23 July 2010, Tim François wrote:
...
More info here:
http://wiki.openstreetmap.org/wiki/User:Tiiiim#Bristol_-_Missing_Roads
Perhaps the figure won't be surprising to many, but I thought it was pretty
large! Is this representative of other similar sized cities/towns? (I know OSL
isn't 'perfect', but its better than nothing....)
...
I was shocked - here in Cambridgeshire, we thought we were getting close to
100% , particularly in the City and South Cambs, so I've had a look at my own
village to try and understand what's going on.
On the Royal Mail list of postcodes for the village, there are 46 streets, and
in OSL, 10 of them are wrong - i.e. 78% correct, which is a bit worse than the
82.98% figure for South Cambridgeshire given at
http://www.itoworld.com/product/data/osm_analysis/
This is a list of the 10 that are wrong:
Name in OSL Name on OSM Comment
Chapman's Way Chapmans Way 2 road name signs, both say Chapmans:
OSM correct
Hill Road Mill Road Mill Road is correct
Unwin's Lane Unwins Lane 2 road name signs say Unwins
and 1 says Unwin's
High Street High Street (Over) Useful distinction from nearby
High Streets in
Swavesey and
Willingham, especially when these names
appear in the like of
www.cyclestreets.net . I'm not
going to change what
has been put on OSM
Station Road Station Road (Over) ditto
The Old Wood Yard The Old Timber Yard Whoops - my mistake. Careless
adding of a new development.
Sign says The Old
Woodyard (all one word) so both wrong!
I will correct
Whines Lane Whine's Lane There are 2 road name signs.
One of each
The Doles The Doles (East) ) OSM reflects signs on
the ground. OSL agrees with the
The Doles The Doles (West) ) Royal Mail street
list.
Randalls Lane Randall's Lane Street sign says Randall's, as OSM
(apologies if the formatting comes out wrong)
In reality, there's only one error in OSM, and 45/46 is 97.8%. I don't want to
get into a debate about apostrophes!
Oh go on, let's start another flaming war! :)
To check, are the OSM names corroborative with the Royal Mail list?
You could then note that there are various farm tracks outside the village
which have names in OSL, missing on OSM and not in the Royal Mail postcode
list: Long Lane, Ouse Fen Road or Bank, Long Holme Drove, Long Drove. There is
no evidence for these names on the ground.
Personally, I would have no problem adding these to OSM.
I think OSL is more accurate than the RM.
Just because there's no sign on the ground it doesn't mean its nameless.
I take data from OS as evidence that there is a name for a road/track etc.
There are some who appear to treat the new data from the OS with extreme
caution, even scepticism & are unwilling to add it.
I think it's a welcome addition & adds quality to the project.
A good caveat for those that are uncertain is to add the source tag
stating that it came form the OS.
Some have been added to OSM from local knowledge: Chain Road, Gravel Bridge
Road. Then we are perhaps at 47/52 = 90.4%
So I am heartened. Tim's analysis is very useful in pointing out areas for
attention, but the reality is not as bad as the figures suggest.
In you neck of the woods you'd be correct, but in Bristol there appears
to be (almost) whole estates that don't even have the roads mapped.
Maybe for the reasons I suggested earlier.
I've tried to do my bit for the 'completeness' by adding a few green
areas such as parks & golf courses etc.
Cheers
Dave F.
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