[OSM-dev] Borders NL

[Jon Burgess]

On Fri, 2007-08-17 at 12:07 +0200, Ante Wessels wrote:

> River and coastlines may cause bigger problems. Here splits are needed too. At 
> some point Zeeburg by Amsterdam was flooded because of a broken coastline. 
> 
> (I see riverbanks do not cause problems even if left open, that's handy:
> http://www.openstreetmap.org/index.html?mlat=51.270120476099486&mlon=4.319354535940356&zoom=12 )
> 

I've run up the current AND2osm.osm file into my own local mapnik
renderer and it shows that several parts of Amsterdam appear under
water. I know the cause of this -- there are water polygons with holes
which Mapnik does not currently render correctly.

To be more accurate, Mapnik can render polygons with holes correctly,
but the osm2pgsql import process breaks them. I'm investigating the best
way to fix this. 

	Jon