[OSM-talk-ie] Query on tracing townlands and dealing with changed lake levels and new boundaries

[Dave Corley]

Hi Killian,

I'm trying to recall what was done in the past for this as I'm sure it's
come up.

To the best of my recollection, stick with the boundary markings as they
exist on the map sheets.

Dave


On 14 May 2015 22:12, "Killian Driscoll" <killiandriscoll at gmail.com> wrote:

> I've been working on tracing townlands by Lough Conn, Mayo and don't know
> how to deal with some boundaries due to the drop in lake levels from
> drainage works. Here http://osm.org/go/etJ86lqw-?m= you can see that I've
> left out four townlands: Scotchfort, Cappanaglogh, Cloonygunnaun, and
> 'Cappanaglogh (Part Of): you can see that the latter is between
> Cappanaglogh, Cloonygunnaun, and with the lake level change and the
> inclusion of a previous island into the townland it's not clear how a new
> boundary should be drawn.
>
> A related issue is whether the boundaries should be redrawn at all here, or
> if the original pre-drainage works lake level boundary should be respected
> (I looked at Lough Gara and see that the tracing has followed the new lake
> level). The GIS townland layer I have used before has kept the original
> townland size and not changed the outline to match the 'new' lake level.
>
> I'd appreciate advice on this,
>
>
> Killian Driscoll
> Banting Postdoctoral Fellow
> Département d'anthropologie
> Université de Montréal
>
> umontreal.academia.edu/KillianDriscoll
> www.lithicsireland.ie
> ca.linkedin.com/in/killiandriscoll
> _______________________________________________
> Talk-ie mailing list
> Talk-ie at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/talk-ie
>