Andrea Antonello ha scritto:
> Hi, I send this to both geotools and udgi, since I assume this is a
> geotools issue, but I have problems with the udig behaviour regarding this.
>
> When I try to reproject from (example) WGS84 4326 to Gauss Boaga 3003 I
> get an exception for the missing bursa wolf paramas. If, as I
> understand, these are the towgs parameters, I feel it is ok. At that
> point udig should however ask for them, right? I should be able to
> supply them if I have them. Probably already in the creation of a
> workspace in a particular projection?
>
> How does Udig deal with it, since it reprojects me the feature layer
> without asking anything from the above two projections and giving no
> problems? What does it do that can't be done otherwise?
Probably uDig asks for a lenient transform, that is, one that tries to
do without the bursa wolf parameters.
As for providing the parameters, it depends on which version of geotools
you're using.
On 2.2.x you have to edit the property file that backs the epsg-wkt
referencing authority and put the towgs84 params in the relevant wkt
definitins.
On 2.3.x, you're out of luck (in Geoserver we have our custom solution).
On trunk, epsg-wkt has been deprecated and we suggest to use epsg-hsql
instead, that has fuller information about CRS systems (such as area
of validity, and towgs parameters for more CRS afaik), and happily
the towgs parameters are included out of the box, here is the
wkt definition I get from Geoserver (which already uses the official
EPSG database):
PROJCS["Monte Mario / Italy zone 1",
GEOGCS["Monte Mario",
DATUM["Monte Mario",
SPHEROID["International 1924", 6378388.0, 297.0,
AUTHORITY["EPSG","7022"]],
TOWGS84[-50.2, -50.4, 84.8, -0.69, -2.012, 0.459,
-5.791915759418465],
AUTHORITY["EPSG","6265"]],
PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
UNIT["degree", 0.017453292519943295],
AXIS["Geodetic longitude", EAST],
AXIS["Geodetic latitude", NORTH],
AUTHORITY["EPSG","4265"]],
PROJECTION["Transverse Mercator", AUTHORITY["EPSG","9807"]],
PARAMETER["central_meridian", 9.0],
PARAMETER["latitude_of_origin", 0.0],
PARAMETER["scale_factor", 0.9996],
PARAMETER["false_easting", 1500000.0],
PARAMETER["false_northing", 0.0],
UNIT["m", 1.0],
AXIS["Easting", EAST],
AXIS["Northing", NORTH],
AUTHORITY["EPSG","3003"]]
About asking interactively, there is no way to alter a CRS definition
once it's build, so it simply does not make sense to provide an
interactive dialog.
Cheers
Andrea
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