[gdal-dev] Flattening in EPSG:3857

Jukka Rahkonen jukka.rahkonen at mmmtike.fi
Fri Nov 19 05:08:37 EST 2010


Hi,

Has EPSG changed again something with the Web Mercator projection? 
The EPSG report about EPSG:3857 shows that it is using a flattened 
WGS84 ellipsoid.

http://www.epsg-registry.org/report.htm?type=selection&entity=urn:ogc:def:crs:EPSG::3857&reportDetail=short&style=urn:uuid:report-style:default-with-code&style_name=OGP%20Default%20With%20Code&title=EPSG:3857

Compare with 

http://www.epsg-registry.org/report.htm?type=selection&entity=urn:ogc:def:crs:EPSG::3785&reportDetail=short&style=urn:uuid:report-style:default-with-code&style_name=OGP%20Default%20With%20Code&title=EPSG:3785

I thought that 3857 was just the same as EPSG:3785 used to be and the same than
the fake EPSG:900913. What should I believe now? Is there any valid EPSG code
for a spherical world or is it better to go with the self made EPSG:900913?

-Jukka Rahkonen-



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