[OSM-talk-ie] Coastline Issue
Hi All. I was doing a bit of mapping in Donegal at the weekend and noticed that there is a coastline error in Dunfanaghy (here: http://osm.org/go/etw3ZZ7e) which places most of the village centre underwater. The county boundary is correct, but the coastline is not. I've been experimenting with building my own tiles and I've learned that the coastline dataset seems to be separate from the main OSM dataset. Before correcting the coastline in this area (to make it match the county boundary) are there any gotchas I should watch out for? Regards, Richard -=- Richard Cantwell www.geographic.ie ___ Talk-ie mailing list Talk-ie@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ie
Re: [OSM-talk-ie] Coastline Issue
The two things that come to my mind are: 1. Don't break the coastline. You would make a lot of people unhappy. So by all means, adjust and improve it - but do not put any gaps in the coast :). 2. Be aware that the coastline will re-render with a long delay. You already know this one, so all is good. - Bartosz ___ Talk-ie mailing list Talk-ie@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ie
Re: [OSM-talk-ie] Coastline Issue
On 26 April 2011 10:57, Richard Cantwell wrote: > I was doing a bit of mapping in Donegal at the weekend and noticed > that there is a coastline error in Dunfanaghy (here: > http://osm.org/go/etw3ZZ7e) which places most of the village centre > underwater. The county boundary is correct, but the coastline is not. Hi Richard, As Bartosz hints, indeed you do yourself, there's actually no problem here. The county boundary you see mapped already corresponds to the coastline. But, because the land and sea polygon generation that Mapnik does happens far less frequently than normal rendering, it still hasn't caught up with the mapped reality. You'll see that it looks find on osmarender, which handles things differently: http://osm.org/go/etw3ZVvW--?layers=O Cheers, Dermot -- -- Igaühel on siin oma laul ja ma oma ei leiagi üles ___ Talk-ie mailing list Talk-ie@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ie
Re: [OSM-talk-ie] Coastline Issue
Aha, thanks guys. /me steps away gingerly from JOSM. On 26 April 2011 11:56, Dermot McNally wrote: > On 26 April 2011 10:57, Richard Cantwell wrote: > >> I was doing a bit of mapping in Donegal at the weekend and noticed >> that there is a coastline error in Dunfanaghy (here: >> http://osm.org/go/etw3ZZ7e) which places most of the village centre >> underwater. The county boundary is correct, but the coastline is not. > > Hi Richard, > > As Bartosz hints, indeed you do yourself, there's actually no problem > here. The county boundary you see mapped already corresponds to the > coastline. But, because the land and sea polygon generation that > Mapnik does happens far less frequently than normal rendering, it > still hasn't caught up with the mapped reality. > > You'll see that it looks find on osmarender, which handles things differently: > http://osm.org/go/etw3ZVvW--?layers=O > > Cheers, > Dermot > > -- > -- > Igaühel on siin oma laul > ja ma oma ei leiagi üles > > ___ > Talk-ie mailing list > Talk-ie@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-ie > ___ Talk-ie mailing list Talk-ie@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ie
Re: [OSM-talk-ie] Coastline Issue
You can check what date the coastline shapefiles are by examining the date of the downloadable files on the OSM tileserver: HEAD http://tile.openstreetmap.org/processed_p.tar.bz2 | grep Last-Modified Last-Modified: Sun, 03 Apr 2011 01:24:09 GMT I've updated the coastline shapefiles on maps.openstreetmap.ie and the coastline is fine: http://maps.openstreetmap.ie/?lat=55.18409&lon=-7.97133&zoom=17&layers=B000FFTF The main OSM tile server is under a lot of pressure at the moment. Even though the coastline shapefiles have been updated, it is dropping some rendering requests. D ___ Talk-ie mailing list Talk-ie@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ie
Re: [OSM-talk-ie] Coastline Issue
Hi Richard I had the same problems mapping Tory Island last year. It took months for the coast line to update. I could not add detail for a long long time Regards Pat On 26 April 2011 10:57, Richard Cantwell wrote: > Hi All. > > I was doing a bit of mapping in Donegal at the weekend and noticed > that there is a coastline error in Dunfanaghy (here: > http://osm.org/go/etw3ZZ7e) which places most of the village centre > underwater. The county boundary is correct, but the coastline is not. > > I've been experimenting with building my own tiles and I've learned > that the coastline dataset seems to be separate from the main OSM > dataset. Before correcting the coastline in this area (to make it > match the county boundary) are there any gotchas I should watch out > for? > > Regards, > > Richard > > -=- > Richard Cantwell > www.geographic.ie > > ___ > Talk-ie mailing list > Talk-ie@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-ie > -- Regards Pat ___ Talk-ie mailing list Talk-ie@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ie
Re: [OSM-talk-ie] Coastline Issue
On 26 April 2011 18:11, Patrick Flanagan wrote: > Hi Richard > I had the same problems mapping Tory Island last year. It took months for > the > coast line to update. I could not add detail for a long long time Hi Pat, In urgent cases it is often possible to reach the admins who can manually cause a coastline update - but why was it an obstacle to adding detail? Dermot -- -- Igaühel on siin oma laul ja ma oma ei leiagi üles ___ Talk-ie mailing list Talk-ie@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ie
Re: [OSM-talk-ie] Coastline Issue
HI Dermot The features which I needed to add would have been placed in the sea.. this might have encouraged users to go out onto the cliff to search. Rgds Pat On 26 April 2011 18:18, Dermot McNally wrote: > On 26 April 2011 18:11, Patrick Flanagan wrote: > > Hi Richard > > I had the same problems mapping Tory Island last year. It took months for > > the > > coast line to update. I could not add detail for a long long time > > Hi Pat, > > In urgent cases it is often possible to reach the admins who can > manually cause a coastline update - but why was it an obstacle to > adding detail? > > Dermot > > -- > -- > Igaühel on siin oma laul > ja ma oma ei leiagi üles > > ___ > Talk-ie mailing list > Talk-ie@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-ie > -- Regards Pat ___ Talk-ie mailing list Talk-ie@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ie
Re: [OSM-talk-ie] Coastline Issue
On 26 April 2011 19:31, Patrick Flanagan wrote: > HI Dermot > The features which I needed to add would have been placed in the sea.. > this might have encouraged users to go out onto the cliff to search. Well, they wouldn't actually have been in the sea. Keep in mind too, that the Mapnik slippy map is only one manifestation of OSM. Garmin maps, Osmarender, Open Mapquest, the Cycle map, all of these have their own approach and might have perfectly fine coastline data. The good news, of course, is that erosion isn't so fast. Once we get the coastline pretty accurate it should stay with us for a good while. Dermot -- -- Igaühel on siin oma laul ja ma oma ei leiagi üles ___ Talk-ie mailing list Talk-ie@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ie
