[OSM-dev] osm2pgsql tile expiry freaks me out

[Frederik Ramm]

Hi,

Frederik Ramm wrote:
> So there are relations, especially boundary relations, where a little 
> change to the relation expires a couple million level-18 tiles. (The 
> largest way, #35421140, a riverbank, expires half a million.)

While this doesn't completely invalidate my findings, I noticed that I 
arrived at very large numbers because my PostGIS database is in lat/lon 
and not spherical Mercator. I had adapted all the tile expiry code to 
work with this, but forgot fixing the EXPIRE_TILES_MAX_BBOX parameter 
which means that when I ran it, osm2pgsql always expired whole polygon 
areas and never only the perimeter.

The fixed version *still* expires lots of tiles for large relations, but 
not quite so many.

Bye
Frederik

-- 
Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"