Hi guys, I asked the tool's maintainer how the floating island error is determined. Here's his answer: http://lists.openstreetmap.org/pipermail/talk/2009-July/038800.html
I've reprinted it here below for convenience: The motto of this check is "you can go everywhere from everywhere". > > There is a set of starting points (highways in the center of big cities > that are well connected to many other streets) I picked randomly. The check > finds ways that are connected to these ways and thus finds a (bigger) set of > ways. This procedure is repeated until no more ways are found. Any way that > was not found is a floating island. > > There are 30 starting points all over the world, one of them in Manila. > > Please note that the check will follow any highway and ferries are > included, so it _should_ find islands as long as there's a ferry connected > to a highway on the island. So it seems that everything not connected to the main streets of Metro Manila is considered as a "floating island". Mindoro is covered since there is a ferry route from Batangas to Puerto Galera. I think if we can at least sketch out the Ro-Ro routes, we can cover most of the major island. I will also suggest adding Cebu and Davao cities as seeds to minimize problems. However, this will not cover all the islands (there are about 2,000 inhabited islands out of 7,100+ and not all of them have regular ferry routes [like Batanes (?) which is served by flights]) so this means that we cannot rely on keep right to point out all floating island errors. I think a customized QA tool for the Philippines would be needed. I hope this helps! In the meantime, just uncheck this error and ignore it until we can have a backbone connection for the Philippines and more seeds. Eugene / seav On Mon, Jul 20, 2009 at 11:13 PM, Totor Osm <totor_...@yahoo.com> wrote: > > I saw some blue arrows indicating 2 roads are close, but not conneected. In > Cebu this is the case near Car-Car in the south, and also in the north of > Cebu Island. Maybe this could be the reason for the "island" warning on > other intersections (Not connected to the world, because of these gaps)? > > I'll try to connect them tomorrow. > > --- On Mon, 7/20/09, Eugene Alvin Villar <sea...@gmail.com> wrote: > > > From: Eugene Alvin Villar <sea...@gmail.com> > > Subject: Re: [talk-ph] Fwd: [OSM-talk] keepright! goes global > > To: "Totor Osm" <totor_...@yahoo.com> > > Cc: "Openstreetmap.ph.mailing.list" <talk-ph@openstreetmap.org> > > Date: Monday, July 20, 2009, 2:53 PM > > Ack! > > > > I've done a quick look around and it seems that the > > general Luzon road network is the only one not riddled with > > these errors! > > > > > > On Mon, Jul 20, 2009 at 10:51 PM, > > Eugene Alvin Villar <sea...@gmail.com> > > wrote: > > > > Hi Totor, > > > > George also replied asking what these floating island > > errors mean. > > > > As far as I understand it, it means that there is a small > > network of navigable ways that is not connected to the rest > > of the network. It does detect "islands" in Metro > > Manila but I'm quite surprised to find that it seems to > > think that the Cebu road network is one big error! Maybe a > > few ferry routes would fix it? > > > > > > > > I'll ask the creator of keep right. I don't think > > he anticipated archipelagos. Hehehe. > > > > Eugene / seav > > > > > > On Mon, Jul 20, 2009 at 10:43 PM, > > Totor Osm <totor_...@yahoo.com> > > wrote: > > > > > > > > > > > > > > Great, > > > > > > > > but,ehr, could it be that Cebu is just one big floating > > island ??? > > > > > > > > > http://keepright.ipax.at/report_map.php?db=osm_XD&zoom=14&lat=10.35578&lon=123.92528&layers=B0T&ch30=1&ch40=1&ch50=1&ch60=1&ch70=1&ch90=1&ch100=1&ch110=1&ch120=1&ch130=1&ch150=1&ch160=1&ch170=1&ch180=1&ch191=1&ch192=1&ch193=1&ch194=1&ch201=1&ch202=1&ch203=1&ch204=1&ch210=1&ch220=1&show_ign=1&show_tmpign=1 > > > > > > > > > > > > Whats wrong with the orange arrows? The nodes of the > > intersections look ok to me... > > > > > > > > > > > > > > > > --- On Sun, 7/19/09, Eugene Alvin Villar <sea...@gmail.com> > > wrote: > > > > > > > > > From: Eugene Alvin Villar <sea...@gmail.com> > > > > > Subject: [talk-ph] Fwd: [OSM-talk] keepright! goes > > global > > > > > To: "OSM" <talk-ph@openstreetmap.org> > > > > > Date: Sunday, July 19, 2009, 4:21 PM > > > > > Hi guys, > > > > > > > > > > The keepright! QA tool for OSM just went almost > > global. > > > > > Previously this tool was only enabled for Europe. This > > tool > > > > > highlights spatial errors (such as overlapping > > unconnected > > > > > ways that have no layer tags to separate them), and > > tagging > > > > > errors (such as POIs without a name tag). > > > > > > > > > > > > > > > Here's a URL centered at the Makati CBD: > > > > > > > > > > > http://keepright.ipax.at/report_map.php?db=osm_XD&zoom=15&lat=14.55284&lon=121.02068&layers=B0T&ch30=1&ch40=1&ch50=1&ch60=1&ch70=1&ch90=1&ch100=1&ch110=1&ch120=1&ch130=1&ch150=1&ch160=1&ch170=1&ch180=1&ch191=1&ch192=1&ch193=1&ch194=1&ch201=1&ch202=1&ch203=1&ch204=1&ch210=1&ch220=1&show_ign=1&show_tmpign=1 > > > > > > > > > > > > > > > > > > > Just pan around to see more errors. Only 100 errors > > are > > > > > shown at a time. > > > > > > > > > > A few reminders: > > > > > 1. There may be false positives. Report it to the > > tool > > > > > maintainer. > > > > > 2. The data is not real time! Errors are based on the > > > > > weekly data dump. So if you correct the error, it will > > still > > > > > be reported until the next data dump is imported by > > the > > > > > tool. > > > > > > > > > > > > > > > Have fun! > > > > > > > > > > > > > > > ---------- Forwarded message > > > > > ---------- > > > > > From: Harald Kleiner <e9625...@gmx.at> > > > > > > > > > > Date: Sun, Jul 19, 2009 at 6:53 PM > > > > > Subject: [OSM-talk] keepright! goes global > > > > > To: OSM Talk <t...@openstreetmap.org> > > > > > > > > > > > > > > > ...well, almost. > > > > > > > > > > > > > > > > > > > > From now on, the site > > > > > > > > > > http://keepright.ipax.at > > > > > > > > > > will provide data consistency checks not only for > > Europe > > > > > but also for > > > > > > > > > > Africa, Asia and South America. > > > > > > > > > > Australia is already covered by the keepright partner > > site > > > > > at > > > > > > > > > > http://keepright.x10hosting.com/ > > > > > > > > > > > > > > > > > > > > What's still missing in the list is North > > America. > > > > > Volunteers who want > > > > > > > > > > to donate computing power are welcome to join. All you > > need > > > > > is a > > > > > > > > > > medium-sized PC running Linux and a little bit of time > > to > > > > > manage running > > > > > > > > > > the program. > > > > > > > > > > > > > > > > > > > > Have a nice weekend! > > > > > > > > > > > > > > > > > > > > Harald > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > > > > > > > talk mailing list > > > > > > > > > > t...@openstreetmap.org > > > > > > > > > > http://lists.openstreetmap.org/listinfo/talk > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > http://vaes9.codedgraphic.com > > > > > > > > > > > > > > > -----Inline Attachment Follows----- > > > > > > > > > > _______________________________________________ > > > > > talk-ph mailing list > > > > > talk-ph@openstreetmap.org > > > > > http://lists.openstreetmap.org/listinfo/talk-ph > > > > > > > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > talk-ph mailing list > > > > talk-ph@openstreetmap.org > > > > http://lists.openstreetmap.org/listinfo/talk-ph > > > > > > > > > > -- > > http://vaes9.codedgraphic.com > > > > > > > > > > -- > > http://vaes9.codedgraphic.com > > > > > > -----Inline Attachment Follows----- > > > > _______________________________________________ > > talk-ph mailing list > > talk-ph@openstreetmap.org > > http://lists.openstreetmap.org/listinfo/talk-ph > > > > > > > > _______________________________________________ > talk-ph mailing list > talk-ph@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-ph > -- http://vaes9.codedgraphic.com
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