I reported your issue to the geotools bug tracker: Accuracy issue reprojecting between EPSG:27572 and EPSG:2154 <https://osgeo-org.atlassian.net/browse/GEOT-6308>
<https://osgeo-org.atlassian.net/browse/GEOT-6308>There are two troubles: - This is an older version of GeoServer so I would like to ask you to test a newer version (preferably a nightly build). I am not sure the last time the EPSG database was updated. - The bug report needs either some sample data to show the problem, or even a sample coordinates (So we can try out the transformation and show the problem, and then try out the fix and show that it is fixed). Can you transform a test point please and let me know what the correct transformed coordinate is? -- Jody Garnett On Thu, 23 May 2019 at 09:49, Jody Garnett <[email protected]> wrote: > The is for the detailed research? Are you in position to make a big report > (preferably with sample data attached as that is often frustrating to > procure). > > On Thu, May 23, 2019 at 1:12 AM DIOT Clément <[email protected]> wrote: > >> Hi all, >> >> >> >> I just suscribed to this user group to share with you an issue and the >> solution. >> >> >> >> Situation : >> >> - Geoserver 2.12.3 (olders have been tested too with same >> observations) >> >> - A first layer is created to load a shape projected in 27572 >> >> - A second one is created to load a raster projected in 2154 >> >> - An agregation is created to mix these two layers, projected >> in 27572. >> >> >> >> Problem : >> >> - The shape is not well placed on the raster, not very far but >> not good. >> >> >> >> If I compare the definition of the projection and the projection on >> https://epsg.io/, I can see that there is some differences (parameters >> TOWGS84 is missing, some values are differents…). >> >> I can then use epsg_overrides.properties to define the projection given >> in epsg.io. >> >> Unfortunately, the result is worst. >> >> >> >> After further try, I mixed the native parameters of 27572 known in >> GeoServer and official parameters given on epsg.io and obtain something >> good : >> >> >> >> 27572=PROJCS["NTF (Paris) / Lambert zone II",GEOGCS["NTF >> (Paris)",DATUM["Nouvelle_Triangulation_Francaise_Paris",SPHEROID["Clarke >> 1880 >> (IGN)",6378249.2,293.4660212936269,AUTHORITY["EPSG","7011"]],TOWGS84[-168,-60,320,0,0,0,0],AUTHORITY["EPSG","6807"]],PRIMEM["Paris", >> 2.5969213, >> AUTHORITY["EPSG","8903"]],UNIT["grade",0.015707963267948967],AXIS["Geodetic >> longitude", EAST],AXIS["Geodetic latitude", >> NORTH],AUTHORITY["EPSG","4807"]],PROJECTION["Lambert_Conformal_Conic_1SP", >> AUTHORITY["EPSG","9801"]],PARAMETER["central_meridian", >> 0.0],PARAMETER["latitude_of_origin", 52.0],PARAMETER["scale_factor", >> 0.99987742],PARAMETER["false_easting", >> 600000.0],PARAMETER["false_northing", 2200000.0],UNIT["m", >> 1.0],AXIS["Easting", EAST],AXIS["Northing", >> NORTH],AUTHORITY["EPSG","27572"]] >> >> >> >> I hope it could help. >> >> >> >> Clément >> >> >> >> [image: background] >> >> >> >> *Clément Diot* >> __________ >> SYSTEL SA >> >> [image: logo] <http://www.systel-sa.fr/> >> >> [email protected] >> >> Phone: +33 5 46 44 57 20 >> >> >> >> >> >> >> _______________________________________________ >> Geoserver-users mailing list >> >> Please make sure you read the following two resources before posting to >> this list: >> - Earning your support instead of buying it, but Ian Turton: >> http://www.ianturton.com/talks/foss4g.html#/ >> - The GeoServer user list posting guidelines: >> http://geoserver.org/comm/userlist-guidelines.html >> >> If you want to request a feature or an improvement, also see this: >> https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer >> >> >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/geoserver-users >> > -- > -- > Jody Garnett >
_______________________________________________ Geoserver-users mailing list Please make sure you read the following two resources before posting to this list: - Earning your support instead of buying it, but Ian Turton: http://www.ianturton.com/talks/foss4g.html#/ - The GeoServer user list posting guidelines: http://geoserver.org/comm/userlist-guidelines.html If you want to request a feature or an improvement, also see this: https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer [email protected] https://lists.sourceforge.net/lists/listinfo/geoserver-users
