Hi Matthias, Oh - thanks for the hint. So probably Reginald is just missing the pyramids in the geopackage - to be created, f.e. with gdaladdo.
Andreas On 2016-09-22 09:56, Matthias Kuhn wrote: > QField does not (yet) support tiff with jpeg compression. > > See: > http://www.qfield.org/docs/project-management/dataformat.html#raster-data > > GeoPackage worked quite nice in our experience and can also be built in > different resolutions (same page further down). > > Matthias > > On 09/22/2016 09:37 AM, Neumann, Andreas wrote: Hi Reginald, > > You can use the JPEG compression inside Geotiff. Note that this can be > specified separately for both the full resolution and the pyramids. You > can also select the compression factor to decrease the file size in > trade off with quality. > > See > also http://www.gdal.org/frmt_gtiff.html and > http://www.gdal.org/gdaladdo.html for > details. > > I believe that modern QGIS versions have these options exposed in the > GUI, but probably not as default. > > So maybe there is room for potential to get a smaller size Geotiff. > > Greetings, > Andreas > > On 2016-09-22 09:32, Reginald Carlier wrote: > > Thanks Andreas, > > Creating a Geotiff with pyramids did the trick. The only disadvantage > is that it created a file of about 1.7 GB (the original was 90 MB). > > Now I am ready to test the app J. > > Regards, > > *Van:*Neumann, Andreas [mailto:[email protected]] > *Verzonden:* woensdag 21 september 2016 16:19 > *Aan:* Reginald Carlier > *Onderwerp:* Re: [Qgis-user] QField > > Hi Reginald, > > Did you create pyramids in the gpkg rasters? > > Generally, Geotiff should be well supported - definitely more tested > than gpkg rasters. I had a 1GB geotiff on qfield (on SD-Card) and it > displays fast. I haven't tested vrt files with geotiffs - if it works > as well? > > Andreas > > On 2016-09-21 15:44, Reginald Carlier wrote: > > Hi Erwan, > > You can look in the list of last week where I posted a couple of > questions about qfield and was pointed to the right website for > documentation. > > I succeeded to publish a map on my phone but the aereal photo > which was published as a gpkg file doesn't render. When I use the > raster.gpkg on my desktop it renders but very slow. > > The gpkg file was created from a 90 MB jp2 file. > > Regards, > > _______________________________________________ > Qgis-user mailing list > [email protected] <mailto:[email protected]> > List info: http://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user > > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: http://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
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