[Imports] Coastline changes Antarctica

Jochen Topf jochen at remote.org
Tue Mar 12 09:42:18 UTC 2013


On Tue, Mar 12, 2013 at 09:20:51AM +0000, Tom Hughes wrote:
> On 12/03/13 09:17, Jochen Topf wrote:
> >On Tue, Mar 12, 2013 at 09:12:39AM +0000, Tom Hughes wrote:
> >
> >>Interesting - that change was Andy's idea and I think the thought
> >>was to reduce the damage done by any breakage and to ensure that
> >>we're not matching any massive polygons in the busy (land) areas.
> >
> >OSMCoastline first generates the land polygons, them splits them, then
> >creates the water polygons as inverse from the lang polygons. If the
> >land polygons are broken, so are the water polygons. So I don't think
> >you can reduce the chance of breakage that way.
> 
> Sure, but the point was to fail to the land background colour not
> the sea so that you don't get "flooding" of the land.
> 
> Don't know if it actually works like that but I think that was the idea.

Depends on where the error is. When the error is in the coastline assembly
and extraction (which is the most likely case, we have seen this often
enough) it will not help.

Jochen
-- 
Jochen Topf  jochen at remote.org  http://www.remote.org/jochen/  +49-721-388298



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