[gdal-dev] Cleaning up the tilefilename generation in gdal2tiles.py

[Martin Krüger]

Hello
I was in need to generate tiles from a geotiff to publish the image as a
tms-service. So i was happy to find the gdal2tiles.py script which does
the job.

The only issue i stumbled over:
gdal2tiles.py generates the tiles in the google format(0,0=top-left) , i
need the tms format(0,0=bottom-left). I  looked at the script  and found
 something not  so nice:
The generation of the tile-filename is with redundancy of 3 times  in
the script.

So i wrote a little patch to keep the generation of the tile-filename in
a single place.  This is a better base for further development of the
script.

best regards
   martin
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