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Found out that this PROJ4 transformation is used so no actual transform is made. Noop seems to stand for No operation. Why? Ballpark geographic offset from Unknown datum based upon the Bessel 1841 ellipsoid to WGS 84 Area of use: World +proj=noop
>but QGIS does not change its GetMap request accordingly. This is a different question however but please drop a line if you know the answer. Add "SERVICE=WMS&FORMAT=image/png&TRANSPARENT=TRUE" to GetMap key OnlineResource.