Hi, I guess that your large numbers are in map projection units (probably metres?), and not lon,lat degrees.
If you have a look at the OpenStreetMap generate_image.py script (http:// svn.openstreetmap.org/applications/rendering/mapnik/generate_image.py) you will see that it starts off with bounds as a lon,lat bounding box and converts it into spherical mercator projection metres. I found the mapnik getting started guide quite good too ( http://trac.mapnik.org/wiki/GettingStarted). Hope that Helps. Graham. -- Graham Jones Hartlepool, UK.
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