[OSM-talk-ie] When is a townland a townland (and when is it 2+ townlands)?

[Dave Corley]

I have a vague recollection of this being discussed way back. The issue is
not just with townlands if I recall correctly.

I think there may also be cp's split by baronies and baronies split by
counties and so on.

Your logic seems sound to me, but then again I never got to doing cp's.

Dave
On 29 May 2016 10:40, "Rory McCann" <rory at technomancy.org> wrote:

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> Hi all,
>
> A while ago I mentioned a possible problem with the Logainm data
> import, where 2+ townlands were getting the same logainm reference[1].
> Upon closer investigation, I don't think this is a bug with the import
> process, but a question of "Is a townland is one townland or many
> townlands?".
>
> Consider Graiguealug townland in Carlow. It's in OSM as 3 different
> townlands: OSM ids https://www.openstreetmap.org/relation/2196774
> https://www.openstreetmap.org/relation/2274862
> https://www.openstreetmap.org/relation/2274863 all touching each
> other. Each is in a different civil parish[2].
>
> However Logainm only has one entry http://www.logainm.ie/en/3531 which
> is in 3 different civil parishes. Logainm allows one townland to be in
> more than one CP. If you look at the GSGS map, only one townland is
> shown on the map, and the total area (~400 acres) is similar to the
> total off the 3 townlands in OSM.
>
> It looks like one townlands was split into 3 townlands so that each
> townland would be in one and only one CP.
>
> However I don't think this is the right approach. I think the OSM
> philosophy of "One Feature, One OSM Element"[3] should apply, and that
> those 3 townlands should be merged into 1. The CP boundaries should
> physically stay where they are, but they will not line up with a
> townland boundary. I seen other examples of townlands crossing CP
> boundaries and have mapped them as one townland, with a CP border
> going through the middle.
>
> I'm tempted to merge townlands like this into one townland. What do
> people think?
>
> Rory
>
> [1]
> https://lists.openstreetmap.org/pipermail/talk-ie/2016-March/001499.html
> [2] Townlands.ie:
> https://www.townlands.ie/carlow/forth/templepeter/templepeter/graiguealug/
>
> https://www.townlands.ie/carlow/forth/tullowmagimma/templepeter/graiguealug/
> https://www.townlands.ie/carlow/forth/nurney/templepeter/graiguealug/
> [3] https://wiki.openstreetmap.org/wiki/One_feature,_one_OSM_element
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