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

[Rory McCann]

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Hi all,

Just as an aside, this sort of "waterways changing" happens in many
places. Ellis Island in New York (yes that one), is partially in the
US state of New York, and partially in New Jersey, due to land
reclaimation works and a dispute over the original treaty/contract
between them. You can see the border of the original island in the
administrative border on OSM:
http://www.openstreetmap.org/#map=17/40.69880/-74.04098

Read more:
http://en.wikipedia.org/wiki/Ellis_Island#State_sovereignty_dispute

Rory

On 14/05/15 23:10, Killian Driscoll 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
> 
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