Ireland/Boundaries
Contents |
Intro
Administrative Boundaries are defined as relations over ways that are either drawn for this purpose only, or use ways that naturally form the boundary, such as center lines of rivers.
Care must be taken not to join those river segments that are part of a boundary with other segments. River segments forming part of a boundary should be additionally tagged with boundary=administrative.
Coastal counties must be closed with a way through the water, capturing the island belonging to the respective county.
All county relations must be circular loops, i.e. all segments arranged in sequence, which can be checked in the JOSM relation editor.
The layers.openstreetmap.fr map viewer has some handy layers for checking the current state of our admin boundaries.
To Do:
Talk about Irish administrative districts: Provinces, Baronies, Civil Parishes, Townlands etc..
Baronies, Civil Parishes, Townlands details should be on each respective county page, eventually.
Data Sources
User:Larryone discovered maps of Ireland from 1900, scanned by Derek from booksulster.com. http://www.libraryireland.com/Atlas/Contents.php. They were converted to images and added to warper. This allows a WMS layer in JOSM.
A number of county borders are based on this out-of-copyright 1900 atlas, more info.
Here is a howto for calibrating the warper at the Lat/Lon grid references in the atlas scans:
- Whatever ellipsoid is being used in the atlas, it might be sufficiently matching the WGS84 at the large scale of the scans
- The atlas grid has lines at e.g. 20', 40', 00', that is in decimal degrees 0.33333333333, 0.6666666666 and 0.0
- In the control-point page of the warper, set a control-point in the left scan window on a grid crossing.
- Set the corresponding point in the right OSM window approximately. Add the control point by pressing the button "Add Control Point".
- In the numerical fields below, you get the approximate Lat/Lon coordinate, so the full degree should be correct.
- adjust the numerical lat/lon values according to the minute grid line, i.e. to end with 0.333333333, 0.6666666666, 0.0000, take care of the correct full degree value at the 0 min line
- the page automatically rounds the decimal degrees to its internal precision, so enter plenty of 66 or 33
- walking along the eastings and jumping up the northings gives a pattern that is easily done
This was done first for Kerry http://warper.geothings.net/maps/1456 and produced good results, without the need to look for existing landmarks.
Boundary Types
refer to boundary=administrative
| Type | admin_level | Notes |
|---|---|---|
| National Border | 2 | e.g. between Rep Ireland and Northern Ireland |
| Northern Ireland state | 4 | reserved for compatability with UK states |
| Province | 5 | e.g. Leinster, Ulster, Munster, Connacht |
| Traditional County | 6 | e.g. Dublin, Tipperary, Cork, Kildare |
| Adminstrative County and County Cities | 7 | e.g. Admin counties (North Tipperary, South Tipperary, Dún Laoghaire-Rathdown, Fingal, South Dublin, Dublin City), 5 County Cities (Dublin City, Cork City, Limerick City , Waterford City, Galway City) |
| Borough & Town councils, and Dublin Postal Districts | 8 | e.g. 5 City Boroughs (Clonmel, Drogheda, Kilkenny, Sligo, Wexford), 75 Town councils (see Local Government), Dublin 7 |
| Townland | 10 |
National Borders
The following relations are being used for the national border:
Republic of Ireland 
62273 (XML, check, manage, JOSM, history, view, gpx ) OPEN
Northern Ireland 156393 (XML, check, manage, JOSM, history, view, gpx ) OPEN
United Kingdom 62149 (XML, check, manage, JOSM, history, view, gpx ) OPEN
The border between the Republic of Ireland and Northern Ireland is mapped, but based on very inaccurate data. So far, no usable source of better data for the whole border has been identified, though out of copyright Ordnance Survey maps would be one option, if available.
For now, a practical approach is to collect waypoint information for known points on the border. Road crossings are the most obvious source here. Typically the border can be identified by a change in road surface and/or a signed change between km/h and mph speed limits. The way point can then be made into a node and the existing border split and spliced to use it.
It is useful, when placing a border node on a surveyed location, to tag the node with something like note=Border Crossing RoI/NI, source=survey. Try to avoid moving nodes tagged in this way.
Progress
Ordered from Carlingford Lough towards Lough Foyle.
| Crossing | Surveyed how? | % confidence | Last updated by | Notes |
|---|---|---|---|---|
| R173 Omeath/Newry | GPS at bridge | 100% | --Mackerski 11:05, 25 May 2008 (UTC) | |
| R132/B113 Carrickcarnon | GPS at pavement and limit change | 100% | --Mackerski 19:19, 7 May 2008 (UTC)-- | |
| Unclassified between R132 and N1 Carrickcarnon | GPS at speed limit change | 95% | --Mackerski 19:19, 7 May 2008 (UTC)-- | Two bridges, exact border unclear, went with speed limit |
| N1/A1 Carrickcarnon | GPS at speed limit change | 100% | --Mackerski 19:08, 7 May 2008 (UTC) | |
| N1 off ramp Jonesborough | GPS at speed limit | 10% | --Mackerski 19:19, 7 May 2008 (UTC)-- | Border is half way up ramp |
| ? at N1 junction Flurry Bridge | GPS at bridge | 100% | --Mackerski 19:19, 7 May 2008 (UTC)-- | Border is River Flurry at west end of bridge over new N1 and J'Borough junction |
| ? Jonesborough-Dundalk near railway | GPS at speed limit change | 100% | --Mackerski 19:19, 7 May 2008 (UTC)-- | Main road to Dundalk from J'borough |
| Railway Dundalk/Newry | GPS at marker | 90% | --Mackerski 19:19, 7 May 2008 (UTC)-- | |
| N2/A5 Aughnacloy | GPS at speed limit change | 100% | --Mackerski 19:24, 7 May 2008 (UTC) | |
| N3/A509 Aghalane | GPS at speed limit change | 100% | --Mackerski 19:24, 7 May 2008 (UTC) | Border follows Woodford River at this point for unknown distance either side of road |
| ? Florence Court Rd-Blacklion | GPS at speed limit change | 100% | --Mackerski 19:24, 7 May 2008 (UTC) | |
| N16/A4 Blacklion/Belcoo | GPS at speed limit change | 100% | --Mackerski 19:24, 7 May 2008 (UTC) | Temporary bridge in place and mapped. Original to be rebuilt, located about 10m west of temp one. |
| R282/? Rossinver/Garrison | GPS at bridge | 100% | --Mackerski 11:05, 25 May 2008 (UTC) | |
| N3/? Belleek | GPS at bridges, road changes, other clues | 100% | --Mackerski 11:05, 25 May 2008 (UTC) | Covers the several crossings S of urban area and the country road north of police station. |
| ?/? Pettigo | The river forms the border in the vicinity of the village | |||
| N14/A38 Lifford/Strabane | Inference from River Location | 80% | --Mackerski 19:40, 7 May 2008 (UTC) | The river forms the border |
| N13/A2 Bridge End/Derry | ||||
| A2/R238 Derry/Muff | Border is directly at southern end of Muff village |
Provinces
| Name | Relation | Notes |
|---|---|---|
| Leinster | 278746 (XML, check, manage, JOSM, history, view, gpx ) circular linked |
|
| Munster | 278750 (XML, check, manage, JOSM, history, view, gpx ) circular linked |
|
| Connacht | 278721 (XML, check, manage, JOSM, history, view, gpx ) circular linked |
|
| Ulster | 278664 (XML, check, manage, JOSM, history, view, gpx ) circular linked |
Counties grouped by province
Leinster
Leinster Administrative Counties
| Name | Relation | Source | Notes |
|---|---|---|---|
| Dublin City | 1109531 (XML, check, manage, JOSM, history, view, gpx ) |
http://www.acts.ie/framed/en.act.1985.0007.6.html#sched1 http://achtanna.oireachtas.ie/framed/en.pract.1953.0001.2.html | |
| Fingal | 1114164 (XML, check, manage, JOSM, history, view, gpx ) |
||
| Dún Laoghaire-Rathdown | 1115720 (XML, check, manage, JOSM, history, view, gpx ) |
||
| South Dublin | 1117469 (XML, check, manage, JOSM, history, view, gpx ) |
Munster
Connacht
| Name | Relation | Source | 1900 map scan |
|---|---|---|---|
| Galway | 335444 (XML, check, manage, JOSM, history, view, gpx ) circular linked |
neighbor counties | http://warper.geothings.net/maps/1457 |
| Leitrim | 284368 (XML, check, manage, JOSM, history, view, gpx ) circular linked |
http://warper.geothings.net/maps/1453 | |
| Mayo | 338539 (XML, check, manage, JOSM, history, view, gpx ) circular linked |
http://warper.geothings.net/maps/wms/1449 | http://warper.geothings.net/maps/1449 |
| Roscommon | 335443 (XML, check, manage, JOSM, history, view, gpx ) circular linked |
neighbor counties | http://warper.geothings.net/maps/1445 |
| Sligo | 335330 (XML, check, manage, JOSM, history, view, gpx ) circular linked |
http://warper.geothings.net/maps/wms/1444 | http://warper.geothings.net/maps/1444 |
