I would like to superimpose openstreetmap data over a raster image, using mapnik. My problem is that this image is not in a projection being defined by a SRS, I have some non-linear algorithm to run to be able to match a pixel and a geographic position.
Is it possible to use some kind of custom converter for positions in mapnik ?
Another possibility would be to modify every longitude/latitude in the database to set them to the corresponding pixels, but I'm afraid that it won't play well with the internal reprojections in mapnik.
I still have the possibility to do everything by hand using the OSM API, but the result would be ugly.
The processing will be done in python.
