[OSM-talk] How to fix wonky coastline?

[Robert Hart]

Steve,

In general the coastlines in the OSM database have been defined as
lines, but are currently being treated as areas by the Mapnik renderer.
This will inevitably lead to the results you are seeing, and the only
fix will be an update to Mapnik, or a re-think of how to represent very
large areas in OSM.

I wouldn't try and "hack" a solution, as that may not be the best
solution in the medium term.

Rob
 

> -----Original Message-----
> From: talk-bounces at openstreetmap.org [mailto:talk-
> bounces at openstreetmap.org] On Behalf Of Steve Bromwich
> Sent: 28 February 2007 17:05
> To: talk at openstreetmap.org
> Subject: Re: [OSM-talk] How to fix wonky coastline?
> 
> Thanks, David. It looks like the problem might be where I split up the
> coastline into multiple ways, as when I bounce between the viewer and
JOSM
> the point where it goes haywire is the node connecting the two ways
(eg,
> http://www.openstreetmap.org/index.html?lat=44.61701416474894&lon=-
> 63.50838186135787&zoom=14
> and
> http://www.openstreetmap.org/index.html?lat=44.61710580833693&lon=-
> 63.56550217216712&zoom=15);
> if I make an area to "block off" areas of sea, do you (or anyone else)
> know if that would cause a problem? I think perhaps making an area
between
> the bridges and the mouth of the harbour, and then the bridges and the
bay
> might do it, but I can't find any obvious guidelines on the wiki.
> 
> Cheers, Steve
> 
> On Wed, 28 Feb 2007, David Groom wrote:
> 
> > Steve
> >
> > Rendering of coastlines in the Mapnik layer is problematic at the
> moment.
> >
> > You could try using JOSM to re-order the segments which make up the
way,
> but
> > I don't think it will help.
> >
> > David
> >
> > ----- Original Message -----
> > From: "Steve Bromwich" <osm at fop.ns.ca>
> > To: <talk at openstreetmap.org>
> > Sent: Wednesday, February 28, 2007 3:48 PM
> > Subject: [OSM-talk] How to fix wonky coastline?
> >
> >
> >> I've been mapping the local coastline using the Yahoo imagery, and
it
> >> seems to have gone awry somewhere; as seen at
> >> http://www.openstreetmap.org/index.html?lat=44.62611672143749&lon=-
> 63.51730825102606&zoom=12
> >> the renderer seems confused about which side of the coastline the
sea
> goes
> >> on. The trigger seems to be a bridge
> >>
(http://www.openstreetmap.org/index.html?lat=44.663245246651634&lon=-
> 63.58339786683845&zoom=14);
> >> on one side it's fine, on the other the sea rendering seems to jump
> from
> >> side to side, with the effect that half of Halifax looks to be
under
> >> water. Is there any way to hint to the renderer which side the sea
goes
> >> on? Alternatively, have I missed something obvious about how to
> annotate
> >> the coastline?
> >>
> >
> >
> >
> > _______________________________________________
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> > talk at openstreetmap.org
> > http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
> >
> 
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