On Thu, Apr 23, 2009 at 4:20 PM, Kev js1982 <o...@kevswindells.eu> wrote: > depending on what the data is stored in - alas I have an issue where it > isn't rendering tiles properly, looks to be memory related - those with > really complex coastlines (North West Wales) are rendering in sea colour, > and those with less complex coastlines (Birmingham) are only rendering roads > for the first 50px or so from the left.....
i remember i had the same problem when i was trying to render tiles in OSGB. i managed to "fix" it by importing the UK extract of the planet into postgis in OSGB, rather than spherical mercator. if i remember right, the problem stemmed from mapnik converting the bounding box from the rendering CS into the DB CS (i.e: OSGB->900913) to do the query and then converting it to the "screen" CS (i.e: 900913->OSGB-ish) to setup the draw clipping box. it wasn't calculating the second transform correctly - or the results were being swamped by numerical error - so the clip box was offset from the drawing area, producing the blank areas you're seeing. i can't remember why i didn't fix mapnik, but i think it may have been easier to just re-import the database in the "native" projection and avoid all the issues. hope this helps, matt _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
