[OSM-talk] Invisible coastline errors in Potlatch

Cartinus cartinus at xs4all.nl
Wed Dec 31 18:20:26 GMT 2008

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
> 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.

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. 


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