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

[Killian Driscoll]

Thanks, I've just read the earlier messages.

For the most part it's not probematical to use the new lake level, but it
does raise some anomalies. For example:
At the SW side of Lough Allen the pre-drainage scheme lake level contained
an island called Inishfale Island with the townland of Derrynadooey to the
west. This contains a national monument RO002-028 (
http://webgis.archaeology.ie/NationalMonuments/FlexViewer/) which is listed
as townland: Inishfale Island; you can see that the map the national
monuments is using respects the pre-drainage shoreline townland outline.
The traced townland on the osm
http://www.openstreetmap.org/?mlat=54.0715&mlon=-8.0517#map=16/54.0715/-8.0517
of Derrnadooey now subsumes Inishfale Island, so the official sites and
monuments record (which was incorrect, as there is no such townland as
Insihfale Island) now conflicts with the townland name provided by osm.






Killian Driscoll
Banting Postdoctoral Fellow
Département d'anthropologie
Université de Montréal

umontreal.academia.edu/KillianDriscoll
www.lithicsireland.ie
ca.linkedin.com/in/killiandriscoll

On 15 May 2015 at 14:40, Donal Diamond <donal.diamond at gmail.com> wrote:

> There's an earlier thread on topic here where conflicting advice was given
> ;-)
>
> https://lists.openstreetmap.org/pipermail/talk-ie/2014-October/000741.html
>
> So looks like it is worthwhile opening up the discussion where we can all
> agree on a common approach.
>
>
> D
>
>
> On 15 May 2015 at 18:32, Killian Driscoll <killiandriscoll at gmail.com>
> wrote:
>
> > Thanks. "stick with the boundary markings as they exist on the map
> sheets":
> > if you scan the lake edges of e.g. Lough Neagh, Gara, Derravaragh, Allen
> > etc. that have lowered lake levels the traced townland boundaries all now
> > match the new lake level, so I think the map sheets have been ignored and
> > new boundaries have been drawn. Maybe others who have been tracing lakes
> > with dropped lake levels can comment?
> >
> > Killian Driscoll
> > Banting Postdoctoral Fellow
> > Département d'anthropologie
> > Université de Montréal
> >
> > umontreal.academia.edu/KillianDriscoll
> > www.lithicsireland.ie
> > ca.linkedin.com/in/killiandriscoll
> >
> > On 15 May 2015 at 13:28, Dave Corley <davecorley at gmail.com> wrote:
> >
> > > 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
> > > > _______________________________________________
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