[OSM-talk] Invisible coastline errors in Potlatch

D Tucny d at tucny.com
Wed Dec 31 19:29:50 GMT 2008


2009/1/1 Cartinus <cartinus at xs4all.nl>

> On Wednesday 31 December 2008 18:40:18 Peter Miller wrote:
> > Dodgy circular ways
> > ---------------------------
> >
> > There are a number of islands off the Swedish coast that are showing
> > up as errors:
> >
> http://tile.openstreetmap.nl/coastlines.html?zoom=16&lat=57.80195&lon=11.66
> >246&layers=B00
> >
> > If one switches to a OSM view
> > (
> http://www.openstreetmap.org/?zoom=16&lat=57.80195&lon=11.66246&layers=B00
> > ) one can edit them. Using 'h' I can see that they haven't been
> > touched for months, however if I click on them the tagging looks fine
> > and the way is shown as circular.
> >
> > Here is the history of one of them:
> > http://www.openstreetmap.org/browse/way/25610508/history
> >
> > Notice that the way appears to be a triangle, but that the way has
> > four points on it.
> >
> > If it does have an extra segment in the way then why does it show up
> > as a circular way in Potlatch? The simples thing will probably be to
> > delete them and recreate them but I though it was worth pointing it
> > out first.
>
> With any circular way the first and the last nodes are the same. So to
> define
> a triangle you get four nodes in the xml.
>

But, the problem is that often with the coastline imports, one of those
nodes is a duplicate... i.e. there are really 4 nodes, but the last one is
at the same point as the first...


>
> Those Swedish islands show up as errors because they are too small.
> Anything
> with a diameter of less than approximately 10 meter shows up as an error.
>
> Are you sure? or is it the previous problem?

d
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