[Proj] Google Mercator Projection

[zagot]

Hi Josè,

you are right I'm confusing by official note... 
1)adding +nadgrids=@null is not necessary and the first result is correct 
6887893.4928337997
3) adding datum is wrong 

finally the follow code is simply correct and my maps is center fine with
proj.dll 4.4.6 :)

from ..."+proj=latlong +datum=WGS84";

to... "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0
+y_0=0 +k=1.0 +units=m  +no_defs"

thanks to all
g.


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