2011/2/25 Josh Doe <[email protected]>: > Hmm, but EPSG:3785 is deprecated, or as EPSG says, "NOT VALID". > EPSG:3857 is equivalent to EPSG:3785, it's just a different > formulation. Here's the change request from EPSG's site (notice the > Actions Take section):
I know that EPSG says "NOT VALID". Who cares? If you look at the specs they are not equivalent (inverse flattening + ellipsoid vs. sphere). When I created my hillshading I first used 3857 (assuming it was 900913) and it didn't fit with the OSM-Mapnik-Rendering. There was a slight offset that disappeared when I reprojected them in Grass GIS to 3785. I tried this empirically and it worked. They cannot be the same (or the Proj.4 has/had a bug). I also asked on the mapnik mailing list and they confirmed that we are not using the inverse flattening (i.e. 3857). I am aware that the web is full of people stating that these 2 are the same. Cheers, Martin _______________________________________________ josm-dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/josm-dev
