Hi Nick,

> Hello everyone,
>
> Would like to test out the code for direct OSM support in Mapnik.  
> Given that
> OSM files are in WGS84 lat/lon, what projection strings do I need  
> for a) the
> Map tag

Well, Map (master) projection can be any supported by proj4. You  
might want to have UK in NatGrid and Canada in Lambert Conformal  
Conic and so on.

> and b) the Layer tag for my OSM layer in the XML file?
>

OSM data is in Geographical projection with WGS84 datum so  
"+proj=latlong +datum=WGS84" should be fine. I think it is OK to omit  
datum as wgs84 is a default anyway.
> Thanks,
> Nick

Cheers
Artem


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