Hello, Mike, Martin gave you a strategy to extract just the referencing information you need since you don't want to have the whole database in your application.
To use the EPSG referencing information, one can either: 1) use one of the databases in the geotools based application 2) extract the needed information and construct programmatically the referencing object one wants. For (2), you can use Geotools and the EPSG database to extract the information you want while you are coding your program. Your code will then use this extracted information to build up the runtime CRS info you will need to perform the transformations. What Martin gave you was a way to run a main() method on one of the classes in the Geotools CRS and pull out the info for the two CRSs that interest you. The main method goes into the EPSG database and dumps out the info as WKT to your console. You can then cut and paste that information into your app to create the CRS your app will need. The epsg-scripts don't need to be run since the databases are already populated. Geotools gives you four EPGS databases, one of which is based on an in memory model. I'm blanking on how to find the code for your particular CRSs and have not yet written that into the user guide. I would try google to find that info. Failing that, look at EPSG and then the code in the CRS classes. Some of the classes have main() methods that dump out a bunch of info. Or ask on this list with the name of the magic two CRSs that interest you. good luck, adrian On Tue, 2007-02-20 at 08:58 +0100, Mike Lehmann wrote: > Thanks for your response. Shouldn't between 1) and 2) the epsg-scripts be > executed to fill the database? Where I can find the EPSG code for the source > and target coordinate systems? Is there a list available for the WKTs of all > coordinate systems? > > -- > Mike > > > Martin Desruisseaux schrieb: > > Le lundi 19 février 2007 à 17:39 +0100, Mike Lehmann a écrit : > >> The last hours I read a lot of documentation about setting up CRS with > >> geotools. Unfortunately, it seems to require a database. We only want to > >> transform between two coordinate systems WGS84 (latitude, longitude) and > >> Gauss-Krüger (Germany, chooseable center-meridian stripe). Is it really > >> necessary to set up a database for this transformation? > > > > You can process with the following steps: > > > > 1) Temporarily put "gt2-epsg-hsql.jar" in your classpath: > > > > 2) Execute the following command from the command line, where <code> > > is the EPSG code for your coordinate reference system: > > > > java org.geotools.referencing.factory.epsg.DefaultFactory <code> > > > > Note: on Geotools 2.4, this command will be replaced by a slightly > > more generic one there (not limited to EPSG codes): > > > > java org.geotools.referencing.CRS <code> > > > > 3) The above-command should print the Well Known Text (WKT) for your > > CRS. Copy and paste the WKT as a String constant in your code. > > > > 4) You can remove the "gt2-epsg-hsql.jar" file from your classpath. > > > > 5) In your code, use > > > > CoordinateReferenceSystem crs = CRS.parseWKT(theWktString); > > > > Martin > > > > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys-and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Geotools-gt2-users mailing list > Geotools-gt2-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Geotools-gt2-users mailing list Geotools-gt2-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
