Thanks for your reply, How can I check if QGIS is applying the transformation or if it asks the service to provide the tiles in 4326?
On 5 Mar 2018 11:17, <b.j.kob...@utwente.nl> wrote: > Most likely the service you are using is only able to provide its maptiles > in 3857 and does not respond to the QGIS request to provide them in 4326 > (or responds, but incorrectly)... > > > > > > -- > > Barend Köbben > > > > On 05/03/2018, 09:39, "Qgis-user on behalf of Idan Miara" < > qgis-user-boun...@lists.osgeo.org on behalf of i...@miara.com> 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 > > > > 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. > > >
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