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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Hi Nicolas,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">I have now been reading into the vrt file.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">All Nodata are the same -9999<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">It seems as if the vrt file takes the min max value from the first rasterfile. I have compared data in the browser.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">If I go to style>properties and load
</span><span lang="EN-US">‘min-max’ actual values. These values are written into the vrt-file.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">So when I close and reopen the vrt file it is back to start again.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">It seems to be a bug.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Could you do me a favor and try this out before I´ll file a ticket.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Lene Fischer<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Fra:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Qgis-user [mailto:qgis-user-bounces@lists.osgeo.org]
<b>På vegne af </b>Nicolas Cadieux<br>
<b>Sendt:</b> 17. april 2016 14:48<br>
<b>Til:</b> qgis-user@lists.osgeo.org<br>
<b>Emne:</b> Re: [Qgis-user] Raster - values and histogram<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Hi,<o:p></o:p></p>
<p>I am not sure if there is a bug but since you have a virtual raster, I would look to see if they all have the same no data values. Try loading only one raster or try saving the virtual raster as a tif and setting the no data value. Do you have the same
problem? <o:p></o:p></p>
<p>If Qgis does not recognize the no data value, it may be thrown out by trying to stretch the image from -32768 to whatever you have. In that case, your raster will not be "viewed correctly" as it is trying to display more than 256 shades which is the max
a screen can handle. In that case you would see only black and white.<o:p></o:p></p>
<p>Hope this help!<br>
Nicolas<o:p></o:p></p>
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<p class="MsoNormal">On Apr 17, 2016 8:22 AM, "Lene Fischer [via OSGeo.org]" <<a href="/user/SendEmail.jtp?type=node&node=5261625&i=0" target="_top">[hidden email]</a>> wrote:<o:p></o:p></p>
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<p>Hi,<o:p></o:p></p>
<p>I´m rehearsing my lectures for tomorrow – and using 2.14.1 on windows.<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>When I create a virtual raster the values are not viewed correct. Then I click Stretch Histogram to full data. Nothing happens.<o:p></o:p></p>
<p>I have to go to properties and load to ‘min-max’ actual values before anything happens.<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>If I use Properties >Histogram and try to Reset and then ReCompute histogram – nothing happens…<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>What do I do wrong?<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>A bit distressed – Giving lectures in raster QGIS tomorrow …<o:p></o:p></p>
<p>Regard<o:p></o:p></p>
<p>Lene Fischer<o:p></o:p></p>
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