[Talk-GB] >- Map layer with OS Locator comparison from ITO

[Jerry Clough - OSM]

I'm with Andy on this. 

Virtually all the 
disagreements between names of roads which I have walked down and 
entered in OSM were down to thick fingers on my part. The places where 
the OS have got it wrong are few and far between (perhaps a bit less 
than 0.5%), but I had to go searching through photographs, audio files 
etc. to make sure that some of these were indeed OSGB errors, as my own 
transcription error rate is at least 10 times higher. Use of a not:name 
tag need not be widespread: it only needs to be used when there is an 
apparently authoritative source which is wrong (i.e., OSGB).

To give two simple examples, where I have already used it:

Smythson Drive is given as 'Smithson Drive' on StreetView and OS Locator. I could quite easily 
have assumed that the it was named after the architect Robert Smythson 
who is buried in the local church, but equally the person who signed the road might not have known the likely origin of the name. However, I do 
have photos of the street sign (which took me about 10 minutes to find). A not:name tag means that I don't have to do that again, and hopefully, it will discourage others from an error of commission.

The 
Chancery located here on OS 
Locator, simply does not exist. It's quite nice not to go off to survey 
some figment of the OSGB's imagination. There is another misplaced 
(duplicate) road nearby. Again some formalised form of the note tag 
seems sensible to identify such cases.

Of course, in the case of 
misnamed roads other more positive evidence can be included, for 
instance links to audio or image files. In the case of The Chancery I have also documented this on the 
relevant Wiki page.

Regards,

Jerry






________________________________
From: Andy Allan 
<gravitystorm at gmail.com>
To: Chris Hill <osm at raggedred.net>
Cc: talk-gb OSM List (E-mail) 
<talk-gb at openstreetmap.org>
Sent: Tue, 1 June, 2010 15:50:41
Subject: Re: [Talk-GB] >- Map layer with OS Locator comparison from ITO

On Tue, Jun 1, 2010 at 3:39 PM, Chris Hill <osm at raggedred.net> wrote:

> On a rainy afternoon I took a look at your overlay and I think it is
> potentially very useful. The main issue I guess is this new tag. I 
think
> "not:*" is imaginative, but it rankles with me somehow. 
How about just
> putting source:name=survey on roads that 
contradict OS Locator to show
> they have been checked on the 
ground.

All the roads I've mapped have been from survey, but what of those
ham-fisted moments in front of the computer?

I think positively identifying what you disagree with is better than
side-effects of other statements. After all, source:name=survey
doesn't 
necessarily mean that you've checked the disagreement between
OS and 
OSM and confirmed that OSM is correct.

Cheers,
Andy

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