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<p>Hi Reginald,</p>
<p>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.</p>
<p>See also <a href="http://www.gdal.org/frmt_gtiff.html">http://www.gdal.org/frmt_gtiff.html</a> and <a href="http://www.gdal.org/gdaladdo.html">http://www.gdal.org/gdaladdo.html</a> for details.</p>
<p>I believe that modern QGIS versions have these options exposed in the GUI, but probably not as default.</p>
<p>So maybe there is room for potential to get a smaller size Geotiff.</p>
<p>Greetings,<br />Andreas</p>
<p>On 2016-09-22 09:32, Reginald Carlier wrote:</p>
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<p class="MsoNormal"><span style="font-size: 11.0pt; font-family: 'Tahoma','sans-serif'; color: #1f497d;">Thanks Andreas,<!-- o ignored --></span></p>
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<p class="MsoNormal"><span style="font-size: 11.0pt; font-family: 'Tahoma','sans-serif'; color: #1f497d;">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).<!-- o ignored --></span></p>
<p class="MsoNormal"><span style="font-size: 11.0pt; font-family: 'Tahoma','sans-serif'; color: #1f497d;">Now I am ready to test the app </span><span style="font-size: 11.0pt; font-family: Wingdings; color: #1f497d;">J</span><span style="font-size: 11.0pt; font-family: 'Tahoma','sans-serif'; color: #1f497d;">.<!-- o ignored --></span></p>
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<p class="MsoNormal"><span style="font-size: 11.0pt; font-family: 'Tahoma','sans-serif'; color: #1f497d;">Regards,<!-- o ignored --></span></p>
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<p class="MsoNormal"><strong><span style="font-size: 10.0pt; font-family: 'Tahoma','sans-serif';">Van:</span></strong><span style="font-size: 10.0pt; font-family: 'Tahoma','sans-serif';"> Neumann, Andreas [mailto:a.neumann@carto.net] <br /><strong>Verzonden:</strong> woensdag 21 september 2016 16:19<br /><strong>Aan:</strong> Reginald Carlier<br /><strong>Onderwerp:</strong> Re: [Qgis-user] QField<!-- o ignored --></span></p>
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<p><span style="font-size: 10.0pt; font-family: 'Verdana','sans-serif';">Hi Reginald,<!-- o ignored --></span></p>
<p><span style="font-size: 10.0pt; font-family: 'Verdana','sans-serif';">Did you create pyramids in the gpkg rasters?<!-- o ignored --></span></p>
<p><span style="font-size: 10.0pt; font-family: 'Verdana','sans-serif';">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?<!-- o ignored --></span></p>
<p><span style="font-size: 10.0pt; font-family: 'Verdana','sans-serif';">Andreas<!-- o ignored --></span></p>
<p><span style="font-size: 10.0pt; font-family: 'Verdana','sans-serif';">On 2016-09-21 15:44, Reginald Carlier wrote:<!-- o ignored --></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto;"><span style="font-family: 'Tahoma','sans-serif';">Hi Erwan,</span><!-- o ignored --></p>
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<p class="MsoNormal" style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto;"><span style="font-family: 'Tahoma','sans-serif';">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.</span><!-- o ignored --></p>
<p class="MsoNormal" style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto;"><span style="font-family: 'Tahoma','sans-serif';">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.</span><!-- o ignored --></p>
<p class="MsoNormal" style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto;"><span style="font-family: 'Tahoma','sans-serif';">The gpkg file was created from a 90 MB jp2 file.</span><!-- o ignored --></p>
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<p class="MsoNormal" style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto;"><span style="font-family: 'Tahoma','sans-serif';">Regards,</span><!-- o ignored --></p>
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