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




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