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Mapnik is an open source mapping toolkit, written in C++ and can be scripted using binding languages such as JavaScript (Node.js), Python, Ruby, and Java. Useful for both Desktop- and Server-based map rendering. It is used by Tilemill, OpenStreetMap, Mapbox, CartoDB, Stamen, MapQuest and Kosmtik.

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Mapnik / OSM data not rendering correctly

As @AndreJ mentioned, using +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs +over' projection in both the script and xml solves the iss …
Dávid Jenei's user avatar