[OSM-talk] OSM et al map projections

Dave osm.list at randomjunk.co.uk
Sun Jan 21 11:48:05 GMT 2007


> Yahoo aerial photo imagery - no idea.
>

Yahoo aerial imagery, yahoo maps, google maps, google aerial imagery, osm
mapnik layer, osm mapnik db layer, and osm osmarender layer tiles are all
the same (or should be). You can overlay them all and they line up
perfectly.

I believe osmarender does some rough scaling for the simple mercator
projection at the centre, and then assumes that the entire area is the same
scale. This approximation will work for small areas. I wouldn't be surprised
if lots of the others were working in the same way.
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