Andrea Aime a écrit :
>> SPHEROID["WGS_1984", 6378137.0, 0.0]
>
> If the original dataset is based on WGS84, then the trasformation would
> include some compensation for the difference between the original
> ellipsoid and the destination sphere, or not?
> The "Google Projection" is made so that you have to ignore them, see:
> http://www.spatialreference.org/ref/user/google-projection/
Oups! I was not aware of that.
In this case, yes we need some trick for forcing application of spherical
formulas on ellipsoidal datum. Your Mercator1SPGoogle (or "GoogleMercator"?)
class seems fine.
Cheers,
Martin
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