Hi Warren, How are you generating envelopes for the 8x8 tile areas? Do you have a buffer area, or is the image just 2048x2048 ? I've seen the problem you describe, and it was a result of sloppy projection math colliding with a half-tile buffer ring, which I was able to fix.
Maybe you could post some pseudocode or something. -mike. On Oct 27, 2008, at 8:47 AM, Warren Vick wrote: > I've enhanced the Mapnik generate_tiles.py script to generate larger > map > views and then output batches (8x8) of map tiles. I found this > necessary > as generate tile sets from large imagery file (say, 100MB per GeoTIFF) > resulted in a huge file load for each an every tile generated. The new > Python script is much quicker but I've exacerbated a problem... > > Some of you may have noticed a one pixel duplication from the bottom > of > one tile and the top of the tile below it. It's usually noticeable on > text (especially when rendered with a halo). My batch version of the > Python script makes this worse and I now see "stutters" of several > pixels (maybe 8 since that's my output tile grid size) which is very > noticeable. Does anyone know the reason for the problem? I thought it > might be a rounding error but Artem's first thoughts are that it's > projection related. > > Regards, > Warren Vick > > > > > _______________________________________________ > 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
