[OSM-talk-ie] Where's the coastline?

Killian Driscoll killiandriscoll at gmail.com
Sat Jun 6 14:00:58 UTC 2015


Hi, maybe I'm getting the wrong end of the stick, but why try and reinvent
the wheel when you can just compare how the land or water is already
interpreted: e.g. look at the EPA map http://gis.epa.ie/Envision /
http://wiki.openstreetmap.org/wiki/Corine_Land_Cover and see what is land,
transitional waterbody, coastline. You don't have to copy the map, just
compare if for reference points, no?

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

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

On 5 June 2015 at 20:07, moltonel 3x Combo <moltonel at gmail.com> wrote:

> On 05/06/2015, Rory McCann <rory at technomancy.org> wrote:
> > Hi,
> >
> > I just wanna check something, to make sure I'm mapping coastlines
> > properly.
> >
> > I'm working around the Clare coast, mapping townlands, and I'm unsure
> > where the coastline is when there is a lot of tides or estuary.
> >
> > In this area: http://www.openstreetmap.org/#map=14/52.7762/-8.9752
> > There's lots of "mud flats"(?) that I'm not marking as coastline, but
> > the GSGS maps show that they are "land". You can see that I've chopped
> >  Islanddavanna Upper in half.
> >
> > Am I mapping coastlines correctly here?
>
> It's always going to be a subjective call. In this particular case, I
> think that these mud flats are "making a fine case for land status",
> quoting Mackerski in http://pastebin.com/rbniH18e. If you look
> closely, you can see man-made paths  There's a clear one at the south
> end of the west mud flat, and there are a few "bridges" connecting
> your coastline to the mud flats. On the other hand, most of the
> surface does get covered by high tides, so according to that IRC
> discussion and the wiki, it should be on the sea side of the
> coastline.
>
> So I mostly agree with your tweaks on the west side, but I'd map the
> path at the south end with a sliver of land around it. And in any
> case, map the "natural=wetland .wetlang=saltmarsh/tidal_flat" area.
>
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