[OSM-talk] Mapnik maxing CPU with Corine data set

[Dermot McNally]

Right - it has taken longer than I expected, but I have an update. We
have "solved" the problem, which was, indeed, down to at least one
over-large polygon. Stripping out the sea polygons didn't fix things,
so we looked for the largest polygon and found a pasture-cover polygon
covering most of the country. We removed it and can now import in 10
minutes (about as long as the country extract takes) and render tiles
quickly.

The results can now be seen on a slippy map:
http://maps.openstreetmap.ie/corineimport.html?zoom=12&lat=53.00344&lon=-6.35329&layers=000BFTTFT

We don't yet have a single layer version representative of what we
would have post-import, but will probably add one.

The missing pasture does leave rather a hole in the country, so we are
looking for nice ways to chop up that polygon, probably at shapefile
level. But that's a much nicer problem to have.

Sincere thanks to all who helped us track this down.
Dermot

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