Great I didn't consider that but will try and implement it. I'll take a look at TileCache too, currently I have my own custom server handling everything. The 128px buffer wasn't enough for me in a few cases though so I might go a bit higher there. Much thanks. -Matt
--- On Tue, 12/23/08, Michal Migurski <[email protected]> wrote: > From: Michal Migurski <[email protected]> > Subject: Re: [Mapnik-users] normal label rendering? > To: "Mapnik users mailing-list" <[email protected]> > Date: Tuesday, December 23, 2008, 3:37 PM > +1 on metatiles. > > I've generally found an extra 128px buffer surrounding > the metatile to > be sufficient for good label coverage. Your metatile size > should be as > large as your rendering machine can comfortably handle > without running > out of physical RAM, but no larger. On the EC2 machine with > 512MB of > RAM where I do most of my mapnik + OSM work, I've > found 8x8 metatiles > to work reasonably well, so that each individual mapnik > render ends up > being 2304x2304 pixels, subsequently cut up into 64 > individual 256x256 > tiles with the outer 128px buffer discarded. Only about 20% > of the > total rendered pixels are discarded. > > For 64x64 tiles, I'd still start by rendering a > 2304x2304 image, > discard the outer 128px buffer, and end up with 1024 > individual tiles > per render. > > TileCache generally handles all of this for you > transparently. > > -mike. > > On Dec 23, 2008, at 10:34 AM, Jay Douillard wrote: > > > Matthew, > > > > Look into metatiles > > http://geowebcache.org/trac/wiki/metatiles > > > > Which you can use tileCache to create with mapnik. > > > > Pretty much the only way to get good labels that > I've found. > > jay > > > > ----- Original Message ----- > > From: "Matthew Rushton" > <[email protected]> > > To: [email protected] > > Sent: Tuesday, December 23, 2008 8:10:45 AM GMT -08:00 > US/Canada > > Pacific > > Subject: [Mapnik-users] normal label rendering? > > > > Hi, > > I'm using mapnik (it's great!) with open > street map to render > > 64x64 tiles. The problem I'm bumping up against is > labels that span > > tiles which in some cases are not being rendered which > produces half > > labels on my map. I realize that for 64x64 tiles the > tiles I need to > > render must be larger for this exact problem and this > makes sense. > > However to get labels to properly render without > getting cut off I > > need to render 512x512 tiles. This is very expensive > and seems > > really wasteful, given the entire label in all cases > would be inside > > a much smaller tile. My question before I go searching > through code > > is, is this normal? What kind of buffer is needed to > properly render > > tiles. Any insight into this would be great! Thanks so > much. > > -Matt > > > > > > _______________________________________________ > Mapnik-users mailing > > list [email protected] > https://lists.berlios.de/mailman/listinfo/mapnik-users > > _______________________________________________ > > Mapnik-users mailing list > > [email protected] > > https://lists.berlios.de/mailman/listinfo/mapnik-users > > ---------------------------------------------------------------- > michal migurski- [email protected] > 415.558.1610 > > > > _______________________________________________ > Mapnik-users mailing list > [email protected] > https://lists.berlios.de/mailman/listinfo/mapnik-users _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
