Martijn van Oosterhout wrote:
 
> On Mon, Nov 3, 2008 at 9:38 AM, Rahkonen Jukka 
> <[EMAIL PROTECTED]> wrote:
> 
> > By topological errors I mean the cases which PostGIS reports with 
> > isvalid(way)=false. I remember that most cases are nested holes, 
> > others included at least those two-point polygons and ring 
> self-intersections.
> > I can count a sorted list while back at home if you wish. 
> My case is 
> > also possible to repeat. I imported the data into PostGIS with 
> > shp2pgslq, source data was processed shapefiles which I 
> downloaded a 
> > few days ago. I don't know if shp2pgsql can generate that kind of 
> > errors by itself, I have not used that tool very much.
> 
> Ah yes, that was my other question: you refer to processed_a, 
> but I can't find a file of that name. Where did you get it?
> 
> The ABA polygons are expected, since mapnik can render them 
> (you get a line). The nested polygon shouldn't happen and 
> ring-self intersections shouldn't happen anywhere where the 
> coastline doesn't show errors...

Processed_a is PostGIS table created from processed_p shapefile by
following the instructions of document 
http://trac.openstreetmap.org/browser/applications/rendering/mapnik/inst
all.txt

-Jukka-
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