Thanks for you reply, Since the problem exist also in 2.18 I don't think it is related with PROJ 5.0, Right?
On 5 Mar 2018 12:39, "Kristian Evers" <kr...@sdfe.dk> wrote: > If you are using PROJ 5.0.0 it is likely to be caused by this known issue: > > https://github.com/OSGeo/proj.4/issues/834 > > /Kristian > > -----Oprindelig meddelelse----- > Fra: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] PÄ vegne af > Benjamin Ducke > Sendt: 5. marts 2018 10:18 > Til: qgis-user@lists.osgeo.org > Emne: Re: [Qgis-user] Pseudo Mercator(OSM) @ EPSG:4326 bug? > > Could it be this: > > http://proj4.org/faq.html#changing-ellipsoid-why-can-t- > i-convert-from-wgs84-to-google-earth-virtual-globe-mercator > > ? > > The further you get from the equator, the more > obvious the discrepancy on the Y axis. > > Best, > > Ben > > On 05/03/18 09:38, Idan Miara wrote: > > Hi, > > > > I might have found a bug related to transformation of layer CRS > > from EPSG:3857 (Pseudo Mercator) to EPSG:4325 (WGS84 Geo). > > I'm attaching a few images to demonstrate the issue. > > > > Steps to reproduce: > > I've load OSM in QGIS 2.18.16 (or 3.0,same results) > > via Tile Server (XYZ): > > https://a.tile.openstreetmap.org/{z}/{x}/{y}.png > > <https://a.tile.openstreetmap.org/%7Bz%7D/%7Bx%7D/%7By%7D.png> > > > > Then set the CRS to EPSG:4326 (WGS84 Geo) > > > > I've also loaded a global bounds vector layer (EPSG:4326) > > > > In scale 1:100,000,000 it seems that the Pseudo Mercator transformation > > to 4326 is flawed, as the OSM and the vectors are not aligned. > > In scale 1:50,000,000 it seems OK when the extent is the middle of the > > map, but if I pan to the south/north it seems distorted again. > > > > If I set the project CRS to EPSG:3857 (Pseudo Mercator) as the CRS of > > the OSM tiles, so the vector layer would be transformed instead, then > > they do align in all scales (picture with the blue vector layer). > > > > It doesn't look like a problem of precision of the transformation from > > 3857 to 4325 because it's way off. > > Is that a bug or am I missing something here? > > > > Kind regards, > > Idan. > > > > > > > > _______________________________________________ > > Qgis-user mailing list > > Qgis-user@lists.osgeo.org > > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > > > > > -- > Dr. Benjamin Ducke > Deutsches ArchÀologisches Institut (DAI) > Zentrale Berlin, IT-Referat > * Projekt "Stunde Null" * > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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