> From: Jochen Topf [mailto:joc...@remote.org] > Sent: Friday, November 22, 2013 1:51 AM > To: Paul Norman > Cc: talk@openstreetmap.org > Subject: Re: [OSM-talk] Coastline updates > > On Thu, Nov 21, 2013 at 09:24:46PM -0800, Paul Norman wrote: > > > From: Jochen Topf [mailto:joc...@remote.org] > > > Sent: Monday, November 18, 2013 8:13 AM > > > To: talk@openstreetmap.org > > > Subject: [OSM-talk] Coastline updates > > > > > > Hi! > > > > > > For the last about two weeks we haven't gotten any coastline updates > > > through. The problem is that every day there is something broken > > > somewhere with the coastline. Often problems get fixed the same day, > > > but new problems show up the next. > > > > Can't osmcoastline localize these problems to a small area? Coastcheck > > kept any errors from impacting entire continents, even when there were > > high numbers of errors. I remember it finding 2k errors when I started > > running it regularly! > > Osmcoastline fixes small gaps in the data. I don't know of anything more > coastcheck did. If anybody can give me any algorithms how to fix the > data or "localize these problems", please do.
A particular square (400x400 mercator km, I think) containing coastline can be evaluated without considering the rest of the continent thanks to the directionality of coastline ways mattering. You'd periodically get squares that would end up incorrect, but it wouldn't generally cause incorrect results outside that square. I don't know any details of the algorithms used since I didn't write or maintain them, I just know the results. _______________________________________________ talk mailing list talk@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk
