Re: [Geotools-gt2-users] Coordinate Transform

[Andrea A. <aa...@op...>]

Martin Desruisseaux ha scritto:
> Andrea Aime a écrit :
>> I believe there are cleaner ways to do this, but it's the only one
>> I could come up in the allotted time. For example, in proj they define
>> the CRS as it really is (mercator over a sphere) and they have a way
>> to say the lat/lon correction must be avoided.
> 
> Do you know how Proj4 said that lat/lon correction must be avoided? If it is a
> parameter, a very simple fix would be to add that parameter (using the same
> name) in the standard Mercator1SP class.

They do use "+nadgrids=@null". One question thought... were is one 
supposed to specify that parameter in WKT? I need to be able and specify
it somewhere, because the google crs is a custom one, and we specify it
in a property file that backs epsg-ext, otherwise I won't be able
to use it in GeoServer (anyways, being able to use it from code it's
a good start).

Proj4 uses a special parameter in WKT, "EXTENSION", but apparently
the gt2 wkt parser cannot handle it (at least, I think last time
I tried the wkt parser threw an error stating the parameter wasn't
recognized... not so sure thought, I may be mistaken).
For more examples see:
http://www.spatialreference.org/ref/user/google-projection/
http://www.spatialreference.org/ref/user/google-projection/ogcwkt/

Cheers
Andrea