Andrea Antonello ha scritto:
> Andrea Aime probaly wrote:
> I don't understand you exactly. When you use reprojection for calculus
> and not just for visualization, things can get bad if the system does
> what it wants without asking. So when I create a map from a shapefile,
> why shouldn't the system ask for the proper values, if there is
> ambiguity? If the user doesn't know, it can get back to a lenient tranform.
Then you have to setup a new CRS object from scratch, and believe me it
may be quite painful if you do that code wise
(there was a tutorial once on how to build a CRS from its basic
elements, where did it end up?).
Once build a CRS object is immutable, so you cannot just take the 3003
version you got form the EPSG database and alter it.
Since you're using uDig 1.0.1 you can also locate the epsg.properties
file and add your custom projections, with custom codes
and custom wkt, something like (taking the pensinsular params):
10003003=PROJCS["Monte Mario / Italy zone 1 / Pensinsular optimized",
GEOGCS["Monte Mario",
DATUM["Monte Mario",
SPHEROID["International 1924", 6378388.0, 297.0,
AUTHORITY["EPSG","7022"]],
TOWGS84[104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68]
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"]]
(but you'll have to write the wkt in a single line).
The epsg.properties file is located inside the epsg-wkt jar. Not sure
the uDig guys setup anything for user customization, that is something
only them can answer.
Cheers
Andrea
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