Hi Alessandro, sorry, put it also here: https://nextcloud.gbd-consult.de/s/QRXAiQdABZGKiXK
Regards, Otto On Wed, 17 Mar 2021 08:14:02 +0100 Alessandro Pasotti <[email protected]> wrote: > Hi Otto, > > I would give it a look but credentials are required to download the test data: > > > The project file and data are in > > https://gitlab.gbd-consult.de/gws/gws-dev/tree/master/data/shared > > (poi_scaled.qgs and poi / subfolder). > > > > > On Wed, Mar 17, 2021 at 6:55 AM Otto Dassau <[email protected]> wrote: > > > > Dear Developers, > > > > i would like to describe a problem using QGIS WMS with defined scale > > visibility for layers. We already spent quite some time on it and for us it > > seems to be a wrong scale calculation in QGIS. But since we are not sure we > > would like to ask, if someone, deeper in the code, can have a look and, if > > it is the case, can provide a (payed) fix. > > > > To better describe the problem we provide a sample web project under > > https://gws-dev.gbd-consult.de/project/scales_qgis/@753753,6661615,100000 > > > > The "Bank" layer has a scale-dependent representation defined in QGIS > > between 100000 - 80000, but is not rendered by QGIS at the scale 100000. > > > > QGIS server is called with these parameters: > > > > http://localhost:4000? > > layers=Bank%20100000-80000 > > &map=%2Fdata%2Fshared%2Fpoi_scaled.qgs > > &transparent=True > > &bbox=748163.2561805135,6646683.920240255,767707.2561805135,6679247.920240255 > > &width=698 > > &height=1163 > > &srs=EPSG%3A3857 > > &format=image%2Fpng > > &request=GetMap > > &version=1.1.1 > > &service=WMS > > &styles= > > > > The resolution (meter per pixel) results from bbox and width > > > > (767707.2561805135 - 748163.2561805135) / 698 = 28 > > > > According to OGC specifications, 1px = 0.28 mm x 0.28 mm, i.e. the scale > > here must be exactly 100000. But QGIS calculates it differently (excerpt > > from the debug log): > > > > src/core/geometry/qgsrectangle.cpp:152 : (toString) [0ms] Extents : > > 748163.2561805135337636,6646683.9202402550727129 : > > 767707.2561805135337636,6679247.9202402550727129 > > src/core/qgsmapsettings.cpp:222 : (updateDerived) [0ms] > > 748163.2561805135337636,6646683.9202402550727129 : > > 767707.2561805135337636,6679247.9202402550727129 > > src/core/qgsmapsettings.cpp:223 : (updateDerived) [1ms] Adjusted map units > > per pixel (x,y) : 28, 28 > > src/core/qgsmapsettings.cpp:224 : (updateDerived) [0ms] Recalced pixmap > > dimensions (x,y) : 698, 1163 > > src/core/qgsmapsettings.cpp:225 : (updateDerived) [0ms] Scale (assuming > > meters as map units) = 1:100314.96052759999292903 > > > > The scale (with the same bbox / width) is calculated as "1: 100314", and > > because that is greater than 100,000, the layer is not rendered by QGIS. > > > > We assume that there is a rounding error somewhere. As said we would be > > happy if a QGIS dev could have a look. The project file and data are in > > https://gitlab.gbd-consult.de/gws/gws-dev/tree/master/data/shared > > (poi_scaled.qgs and poi / subfolder). > > > > Thanks a lot! > > Otto > > > > -- > > Geoinformatikbüro Dassau GmbH > > Rethelstrasse 153 > > D - 40237 Düsseldorf > > Tel: +49-211-69937750 > > Mobil: +49-171-4687540 > > https://www.gbd-consult.de > > > > Registergericht: Amtsgericht Düsseldorf, HR B 74022 > > Geschäftsführer: Otto Dassau > > _______________________________________________ > > QGIS-Developer mailing list > > [email protected] > > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > > > -- > Alessandro Pasotti > QCooperative: www.qcooperative.net > ItOpen: www.itopen.it -- Geoinformatikbüro Dassau GmbH Rethelstrasse 153 D - 40237 Düsseldorf Tel: +49-211-69937750 Mobil: +49-171-4687540 https://www.gbd-consult.de Registergericht: Amtsgericht Düsseldorf, HR B 74022 Geschäftsführer: Otto Dassau _______________________________________________ QGIS-Developer mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
