First time caller, long time listener. I've been using OSM for about three month now and am amazed at it's potential. I have been exporting street maps for printing, and am drooling for more. After reading a series of threads, I am sure that what I am about to ask has been accomplished, but I can't find any documentation to support it.
Here goes: I am interested in making larger maps than OSM.org allows and have successfully setup Mapnik to create these images, but cannot get the scale right. If I export using the OSM export tag, it's perfect, but if I create a bounding box in Mapnik and export and set the zoom level and image size, my image isn't scaled correctly. Does anyone know how the export algorithm in OSM works, and what steps I may be missing? Thanks, Mark Firmin
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