Remember to communicate via geotools-gt2-users list so others can help out. While I responded quickly with docs I do not generally work on the referencing system. If you are unable to communicate in public there are a number of commercial support options available (including my employer).
Enjoy using GoeTools! -- Jody Garnett On Jul 15, 2024 at 12:52:50 AM, Mourad HARMIM <mourad.har...@live.fr> wrote: > Hello Jody, > > Thank you for your early reply. > I actually added the dependency gt-epsg-hsql where the thecoordinate > references are supposed to be. > I also tried passing wkt definitions (which reliability are not sure) but > still not working. > > I'll lookup the guide you provided. Let's keep in touch. > > Best regards, > Mourad Harmim. > ------------------------------ > *De :* Jody Garnett <jody.garn...@gmail.com> > *Envoyé :* lundi 15 juillet 2024 03:08 > *À :* Mourad HARMIM <mourad.har...@live.fr> > *Cc :* geotools-de...@lists.sourceforge.net < > geotools-de...@lists.sourceforge.net>; > geotools-gt2-users@lists.sourceforge.net < > geotools-gt2-users@lists.sourceforge.net> > *Objet :* Re: [Geotools-devel] Help with GeoTools : Trouble transforming > coordinates > > The user list is the right place to ask. > > I do not work on the coordinate reference system so much myself, there is > a handy guide for configuring here: > > https://docs.geoserver.org/main/en/user/configuration/crshandling/index.html > > Using this approach you can provide the transform, however I am curious > why GeoTools does not have the required information. Are you using > gt-epsg-shall for definitions or the wkt one? > > If you look up online can you compare the information to what is included > in GeoTools? > -- > Jody Garnett > > > On Sun, Jul 14, 2024 at 5:31 PM Mourad HARMIM <mourad.har...@live.fr> > wrote: > > Hello everyone, > I hope this message finds you well. > > My name is Mourad Harmim, a Data Engineer consultant from France. > Still getting used to GeoTools, I’m facing an issue when I try to > transform coordinates from *Lambert 2 extended (EPSG :27572) to Lambert > 93 (EPSE :2154).* > > Here is my current situation : > > - When I use : *this.mathTransform = > CRS.findMathTransform(CRS.decode("EPSG:27572") , CRS.decode("EPSG:2154"), > false)* there is an error telling that Bursa Wolf parameters are > missing > - When I use : *this.mathTransform = > CRS.findMathTransform(CRS.decode("EPSG:27572") , CRS.decode("EPSG:2154"), > true)* I get coordinates but they seem inaccurate (I guess it is about > a missing grid shift) > - When I use intermediate system : * Lambert 2 extended (EPSG :27572) > to WSG84 (EPSG:4326) to Lambert 93 (EPSE :2154)* I get better results > but still inaccurate. > > > I would like to know what it is the correct approch to have an accurate > transformation between these two systems. > > I hope that it is not inappropriate to ask for your help through this > email and I hope to hear from you soon. > Thank you. > > Mourad Harmim. > _______________________________________________ > GeoTools-Devel mailing list > geotools-de...@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/geotools-devel > >
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