I'm trying to convert from EPSG 26191 to WGS, here is the code im using to transform but it still prints for me when I get the SRID as 26191.

    CoordinateReferenceSystem sourceCRS = CRS.decode("EPSG:26191");
    CoordinateReferenceSystem targetCRS= CRS.decode("EPSG:4326");
    MathTransform transform = CRS.findMathTransform(targetCRS, sourceCRS);
    var x = JTS.transform(sourceGeometry, transform);
  • 1
    do the actual coordinates change? GeoTools (and JTS) don't actually do anything with the SRID stored in the geometry
    – Ian Turton
    Commented Jun 13, 2022 at 10:58
  • related to gis.stackexchange.com/questions/97265/…
    – Ian Turton
    Commented Jun 13, 2022 at 11:00
  • oh yes! you're right thank you SRID doesn't change but my geometry coordinates changed ! Commented Jun 13, 2022 at 12:23
  • But there is still a problem my polygon is not where it supposed to be i don't know why Commented Jun 13, 2022 at 12:24
  • please add an example input and the expected and observed output
    – Ian Turton
    Commented Jun 13, 2022 at 12:41

1 Answer 1


After debugging I noticed that the geometry is changed but the SRID is not. As @lan Turton told me, you can update it yourself if you want. One thing I noticed is that the long lat is inversed and for that you just need to add the attribute true to CRS.decode method.

sourceCRS = CRS.decode("EPSG:26195", true);
CoordinateReferenceSystem targetCRS = CRS.decode("EPSG:4326", true);
MathTransform transform = CRS.findMathTransform(sourceCRS, targetCRS);
return JTS.transform(sourceGeometry, transform);

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