[OSM-dev] Code to convert lat/lon to metres in Mercator projection?

Nick Whitelegg nick at hogweed.org
Tue Jan 9 21:47:29 GMT 2007

Hello everyone,

Has anyone written any code to convert lat/lon to Mercator projection in metre 
units (metres east and north of the intersection of the Greenwich meridian 
and equator)? There's plenty of lat/lon to Mercator converters around (e.g. 
that in JOSM) but they give the answer in obscure units, e.g:

51.05 -0.72


-0.0125664 1.03951

I need this to generate Freemap tiles using Mapnik in mercator projection, but 
I want to be able to specify the scale in something like pixels/km.


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