Hope I am not being offtrack, but if you are looking for
quick'n'dirty'n'scripty, download proj4 and do something like:
echo "2 45" | proj +init=epsg:27572
Or if you want to go backwards into geographics:
echo "941943 2009361" | invproj +init=epsg:27572
Paul
On 2-Dec-05, at 7:52 AM, Peter Zankl wrote:
Hi Martin
THX a lot for your suggestions !
:-)))
> But you don't really need this WKT.
I would have preferred the WKT because it implies a copy/paste
operation instead of a download of the database, configure the
system etc. I develop on different machines and if I want to repeat
the transfromation I will have to configure each machine before
running it :-(
Anyway: trying the WKT gives me the following exception
> No transformation available from system
"GeographicCoordinateSystem(WGS84)"
> to "ProjectedCoordinateSystem(NTF (Paris) / Lambert zone II)".
> [...cut...]
> Caused by: org.geotools.ct.NoSuchClassificationException: No
transform for
> classification "Lambert Conic Conformal (1SP)".
maybe the WGS84 definition I took from a tutorial page is missing
something:
String TARGET_WKT = "GEOGCS[\"WGS84\", DATUM[\"WGS84\", SPHEROID
[\"WGS84\", 6378137.0, 298.257223563]], PRIMEM[\"Greenwich\", 0.0],
UNIT[\"degree\",0.017453292519943295], AXIS[\"Longitude\",EAST],
AXIS[\"Latitude\",NORTH]]";
Or maybe I could try to add TOWGS84[<seven param>] to the SourceWKT
(I think I saw a ToWGS84() methode somewhere...)
> But you don't really need this WKT. In yours code, just write
> CRSAuthorityFactory f = FactoryFinder.getCRSAuthorityFactory
("EPSG");
> CoordinateReferenceSystem crs = f.createCoordinateReferenceSystem
("27572");
As I got stuck with the WKT approach I downloaded the EPSG database
and configured a System Data Source for the Access file:
CRSAuthorityFactory f = FactoryFinder.getCRSAuthorityFactory
("EPSG",null);
try {
CoordinateReferenceSystem sourceCRS =
f.createCoordinateReferenceSystem("27572");
CoordinateReferenceSystem targetCRS =
f.createCoordinateReferenceSystem("7030");
} catch (FactoryException e1) {...}
Again I'm stuck with an exception:
> WARNING: Can't load a service for category DataSource.
> sun.misc.ServiceConfigurationError:
> org.geotools.referencing.factory.epsg.DataSource: Provider
> org.geotools.referencing.factory.epsg.PostgreDataSource could not
be instantiated: java.lang.NullPointerException
at sun.misc.Service.fail(Unknown Source)
at sun.misc.Service.access$200(Unknown Source)
Looks like i should read some further docs to access the *.mdb
Datasource instead of a Postgres driver...
...or switch to the hsql version.
time for a break
[let's kick some innocent wall without being caught by the "Protect-
Innocent-Walls-Ligue"...]
Thank you all for geotools, it looks like a really great tool.
It's the fact that I have limited understanding of the GIS business
in general that makes me stumblin around - it's a frustrating
experience to get nothing but exceptions for hours and hours...
Peter
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