<div dir="auto">Thanks for your reply,<div dir="auto">How can I check if QGIS is applying the transformation or if it asks the service to provide the tiles in 4326?</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 5 Mar 2018 11:17,  <<a href="mailto:b.j.kobben@utwente.nl">b.j.kobben@utwente.nl</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





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<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Georgia",serif">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)...
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<p class="MsoNormal"><span style="font-family:"Georgia",serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif">--<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif">Barend Köbben<u></u><u></u></span></p>
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<p class="MsoNormal">On 05/03/2018, 09:39, "Qgis-user on behalf of Idan Miara" <<a href="mailto:qgis-user-bounces@lists.osgeo.org" target="_blank">qgis-user-bounces@lists.<wbr>osgeo.org</a> on behalf of
<a href="mailto:idan@miara.com" target="_blank">idan@miara.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal"><a name="m_382310329094522456__MailOriginalBody"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white">Hi,</span></a><span>
<u></u><u></u></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222">I might have found a bug related to transformation of layer CRS from <span style="background:white">EPSG:3857
 (Pseudo Mercator) to EPSG:4325 (WGS84 Geo).</span><u></u><u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white">I'm attaching a few images to demonstrate the issue. <u></u><u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white"><u></u> <u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white">Steps to reproduce:<u></u><u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white">I've load OSM in QGIS 2.18.16 (or 3.0,same results)<u></u><u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white">via Tile Server (XYZ):<u></u><u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span></span><a href="https://a.tile.openstreetmap.org/%7Bz%7D/%7Bx%7D/%7By%7D.png" target="_blank"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#1155cc;background:white">https://a.tile.openstreetmap.<wbr>org/{z}/{x}/{y}.png</span></span><span></span></a><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white"><u></u><u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white"><u></u> <u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white">Then set the CRS to EPSG:4326 (WGS84 Geo)<u></u><u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white"><u></u> <u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222">I've also loaded a global bounds vector layer (EPSG:4326)<u></u><u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222">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.<u></u><u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222">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.<u></u><u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222"><u></u> <u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222">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).<u></u><u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222"><u></u> <u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222">It doesn't look like a problem of precision of the transformation from 3857 to 4325 because
 it's way off. <u></u><u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222">Is that a bug or am I missing something here?<u></u><u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222">Kind regards,<u></u><u></u></span></span></p>
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<p class="MsoNormal" style="background:white"><span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222">Idan.<u></u><u></u></span></span></p>
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