[Proj] Google Mercator Projection

zagot maurelio at live.it
Thu Aug 4 10:59:14 EST 2011

Hi Josè,

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

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