[OSM-talk] Slippy map - Mapnik layer UK coastlines

Artem Pavlenko artem at mapnik.org
Fri Mar 23 13:48:43 GMT 2007

Hi David,

On 23 Mar 2007, at 11:48, David Groom wrote:

> It seems that the UK coastline is beginning to render better in the  
> Mapnik
> layer of the slippy map (it's a solid blue fill, rather than the  
> odd shaped
> grey polygons).
> However it does appear that the source for the coastline might be a  
> rather
> out of date planet file.
> In some places, eg
> http://www.openstreetmap.org/index.html? 
> lat=50.85383936185782&lon=-1.315713476905844&zoom=15
> ,there is an exact correlation between coastline which is shown in the
> Mapnik and Osmarender layers.
> In other places eg ,
> http://www.openstreetmap.org/index.html? 
> lat=50.81094579389664&lon=-0.09869895092239864&zoom=15
> ,the coastline outline in the Osmarender layer seems to be much  
> more recent
> than the Mapnik layer.

For most of the world I was using original shoreline data, hence it's  
not as smooth as it should. Polygons are only available for England  
and Wales, the rest gets blue shoreline lines.  To have proper  
polygons for the whole planet :

1. We need to agree that storing countries boundaries as polygons is  
way forward.

2. We have to decide if storing these polygons in main OSM database  
is a good idea or not. I personally think it'll be better to store  
them separately.

3. Start creating polygons. I have all the tools and I'm happy to  
help anyone, but it is a big task which requires community  
  On the other hand, If one person capable of fixing most of the UK  
coastline it should be peanuts for OSM as a whole. If you want to see  
nice blue sea and land just do it, don't wait!


> David
> _______________________________________________
> talk mailing list
> talk at openstreetmap.org
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Artem Pavlenko

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