On Fri, Feb 22, 2008 at 2:29 PM, Andy Allan <[EMAIL PROTECTED]> wrote: > > On Fri, Feb 22, 2008 at 2:18 PM, Dave Stubbs <[EMAIL PROTECTED]> wrote: > > On Fri, Feb 22, 2008 at 1:50 PM, Jo <[EMAIL PROTECTED]> wrote: > > > Do the transparent layers take the same amount of time to render as the > > > base layer for a given area? > > > > > > > > > This will depend entirely on what you put on them, and how you > > organise that data in the database. > > Assuming your transparent layer only has a few lines (ie: bus routes) > > and you keep this data in a separate table, then they'll render > > faster, probably a lot faster. > > ...than normal background tiles. I don't think Dave meant to imply > that it's quicker to render "background tiles" + "overlay tiles" than > it is to render one set of "background + overlay" tiles. Or in other > words, every line that gets drawn takes a certain amount of time. It > doesn't matter what the background colour is. > > If you only want to draw some overlays for the standard OSM tiles then > you're quicker just drawing the overlays. >
I was answering the question: is mapnik rendering speed limited by pixel area, or by data density? To which the answer is data density for the base tiles. I'm still trying to work out what Andy thinks I said, which probably says more about my brain than his. _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
