[GRASS-user] m.proj transformation to EPSG3785 / KML

[Markus Neteler]

On Mon, Jul 20, 2009 at 8:16 PM, Hamish<hamish_b at yahoo.com> wrote:
...
> FWIW & AFAIK, KML takes coordinates as wgs84 LL, and the "Google
> projection" is a highly dubious beast that should be avoided if
> at all possible.

Yes!
See also comment here:
http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::3857
"<remarks>
Uses spherical development of ellipsoidal coordinates. Relative to an
ellipsoidal development errors of up to 800 metres in position and 0.7
percent in scale may arise. It is not a recognised geodetic system:
see WGS 84 / World Mercator (CRS code 3395).
</remarks>
"

The error is significant for many GIS applications.

Markus