For each map "frame": Import %.osm% file into PostGreSQL:osm2pgsql -S /home/derick/install/osm2pgsql/default.style --slim -d gis -C 2400 $i Only if it's not the same as the previous one Read calculated bounding boxes and put those in the environment Run mapnik to render image: export MAPNIK_MAP_FILE=/home/derick/install/mapnik/osm.xml /home/derick/install/mapnik/generate_image.py ${LAT1} ${LON1} ${LAT2} ${LON2}