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

Dave Corley davecorley at gmail.com
Fri Mar 27 22:10:23 UTC 2015


That was quick!

Thanks Donal

On Fri, Mar 27, 2015 at 8:47 PM, Donal Diamond <donal.diamond at gmail.com> wrote:
> 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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>> >
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