[OSM-talk-ie] Irish boundaries map layer updates

Donal Diamond donal.diamond at gmail.com
Fri Mar 27 20:47:40 UTC 2015


All boundaries should start appearing at zoom 7 now.

Also changed the townland map layer to show  ARP rather than fractional
acres.

Hope this helps...

D

On 27 March 2015 at 20:21, Dave Corley <davecorley at gmail.com> wrote:

> Completely agree, this is fantastic
>
> Can I ask, is it possible to make all layers appear on the same zoom
> levels, e.g. The cp's can't be viewed when zoomed out far enough to see the
> whole island.
> On 27 Mar 2015 20:19, "Dave Foley" <dafo43 at outlook.ie> wrote:
>
> > Great work Donal, that's really useful for checking mistakes with the
> > boundaries.
> >
> > Dafo
> >
> > > Date: Thu, 26 Mar 2015 22:53:43 +0000
> > > From: donal.diamond at gmail.com
> > > To: talk-ie at openstreetmap.org
> > > Subject: [OSM-talk-ie] Irish boundaries map layer updates
> > >
> > > The map layers showing Irish boundaries is now updated every 15
> minutes.
> > >
> > > This includes county/barony/civil parish/ed and townlands.
> > >
> > > The map server starts updates at 05/20/35/50 minutes past the hour and
> > > should have all Irish edits up to 00/15/30/45 minutes past
> respectively.
> > > Updates should take about 2 minutes.
> > >
> > > I also updated the townland layer to show area in fractional acres from
> > > zoom 14 onwards. This may help you compare the acreage value shown on
> the
> > > GSGS3906 maps to help spot obvious errors.
> > >
> > > For example, I picked a spot at random below and you can see that there
> > are
> > > a few areas that have the wrong acreage due to some townlands being
> > missed:
> > >
> > >
> >
> http://maps.openstreetmap.ie/oocmaps.html?zoom=15&lat=53.71215&lon=-6.91047&layers=000B0TFFFFTFFF
> > >
> > > eg Barfordstown is reported as 482 acres as we actually included  two
> > > townlands Barfordstown 283 acres and Boolies 198 acres. There's a
> similar
> > > issue with Calliaghstown nearby.
> > >
> > > When comparing fractional acres and  ARP (acres,roods, perches) on the
> > map,
> > > bear in mind that:
> > > 1 acre = 4 roods
> > > 1 rood = 40 perches
> > >
> > > You'll also notice a small difference in the acreage size reported by
> > > townlands.ie and the map layer. That is due to the map layer
> > transforming
> > > to Irish Grid when calculating the area to get a slightly more accurate
> > > calculation. Townlands.ie has to do a lot more analysis so uses a
> > different
> > > spatial reference system.
> > >
> > > Anyway hope it helps.
> > >
> > > D
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