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 <[email protected]> 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 <[email protected]> > 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 > > _______________________________________________ > > Talk-ie mailing list > > [email protected] > > https://lists.openstreetmap.org/listinfo/talk-ie > > > _______________________________________________ > Talk-ie mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/talk-ie > _______________________________________________ Talk-ie mailing list [email protected] https://lists.openstreetmap.org/listinfo/talk-ie
