Re: [Geotools-devel] Cassini-Soldner projection

[Mauro B. <m.b...@es...>]

I did some investingation on the math and it seems correct to me (there 
was a little typo in the forward conversion, so I have just updated the 
patch attached to the jira issue).
>
> The problem is not in the latitude of origin, but in the lack of the
> TOWGS84 parameter. The projection library won't be able to make a proper
> datum change.
> If you look at the srs list of GeoServer you'll see that the Bessel
> ellipsoid is used in many many projections, and each one has a different
> set of TOWGS84 parameters depending on how the ellipsoid is 
> located/rotated relative to the wgs84 one (which is geocentric).
> You'll have to find the proper parameter for that area of Italy...
> unfortuantely the EPSG database does not seem to contain any.
Unfortunately I'm not able to find any too, so for now I think we have 
to wait for someone luckier than us :-)
Apart from the Italian situation, maybe the projection itself could be 
useful to other countries.

Mauro