[OSM-talk-ie] Typos in Townland names

[Donal Diamond]

OSI released townland opendata, which we can also use for comparisons.

I've a viewer to compare OSM and OSI here:

http://maps.openstreetmap.ie/os_opendata.html?zoom=14&lat=53.26797&lon=-6.38816&layers=B0FTTFFFFFF

Donal



On 15 February 2017 at 16:22, Brian Tuffy <brian.tuffy at gmail.com> wrote:

> Hi Colm,
> Thanks for your addition, every little helps!
> I agree with you that we must not assume that the mistake is always in the
> OSM entry. Often the entry in OSM is of greater value, even if it does not
> match any official names, for example, I have added the local name of a
> townland "Guesdian"  I know this is the name everyone uses and it is the
> name on the townland marker-stone in the area. However the official name is
> "Geesadan" and there are alternative names such as "Gweeshadan" all for the
> same place. So we have to be very careful correcting names!
> I recommend to use local_name= and alt_name= tags where possible. We can
> check the version history of a townland relation (version #) and if the
> name does not change since it was first added, then I can assume that a
> local name was not added. The typos occurred when copying the name from the
> maps because they are hard to read. I think 4.3% error in names is actually
> impressively low.
>
> The obvious way to identify a typo is to check if any of the names in the
> relation exactly match the original townlands map source. Those names
> should be present in some form, possible alt_name or something.
> http://maps.openstreetmap.ie/      and click mapwrapper GSGS3906
>
> Cheers,
> Brian T
>
>
>
>
> On Wed, Feb 15, 2017 at 4:00 PM, Colm Moore <colmmoore72 at hotmail.com>
> wrote:
>
> > Hi,
> >
> >
> > I corrected at least one - Kiltalown in Dublin-  after checking with
> Rory:
> > http://www.openstreetmap.org/relation/4513764
> >
> >
> > However, in dealing with 60,000+ names, we need to be careful and not
> > assume that all the mistakes are in the OSM data entry - it may be that
> > there are errors in other sources, e.g. "Little Island" in Cork shows up
> > some older Ordnance Survey maps as "LITTLEISLAND", which is somewhat
> > obviously incorrectly spaced:
> >
> >
> > http://maps.osi.ie/publicviewer/#V2,575522,571859,9,8
> >
> > http://www.openstreetmap.org/relation/6514445
> >
> >
> > Colm
> >
> >
> > ------------------------------------------------------------
> > ---------------------------------------------------
> > Never doubt that a small group of thoughtful, committed citizens can
> > change the world. Indeed, it is the only thing that ever has. Margaret
> Mead
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