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.diam...@gmail.com > To: talk-ie@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 > _______________________________________________ > Talk-ie mailing list > Talk-ie@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-ie _______________________________________________ Talk-ie mailing list Talk-ie@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ie
