<p dir="ltr">Yup, </p>
<p dir="ltr">I can check on Monday.</p>
<p dir="ltr">Nicolas</p>
<div class="gmail_quote">On Apr 17, 2016 11:59 AM, Lene Fischer <lfi@ign.ku.dk> wrote:<br type='attribution'><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p><span style="font-size:10pt;font-family:'verdana' ,">Hi Nicolas,</span></p>
<p><span style="font-size:10pt;font-family:'verdana' ,">I have now been reading into the vrt file.
</span></p>
<p><span style="font-size:10pt;font-family:'verdana' ,">All Nodata are the same -9999</span></p>
<p><span style="font-size:10pt;font-family:'verdana' ,"> </span></p>
<p><span style="font-size:10pt;font-family:'verdana' ,">It seems as if the vrt file takes the min max value from the first rasterfile. I have compared data in the browser.</span></p>
<p><span style="font-size:10pt;font-family:'verdana' ,">If I go to style>properties and load
</span>‘min-max’ actual values. These values are written into the vrt-file.</p>
<p>So when I close and reopen the vrt file it is back to start again.</p>
<p><span style="font-size:10pt;font-family:'verdana' ,"> </span></p>
<p><span style="font-size:10pt;font-family:'verdana' ,">It seems to be a bug.</span></p>
<p><span style="font-size:10pt;font-family:'verdana' ,">Could you do me a favor and try this out before I´ll file a ticket.</span></p>
<p><span style="font-size:10pt;font-family:'verdana' ,"> </span></p>
<p><span style="font-size:10pt;font-family:'verdana' ,">Regards</span></p>
<p><span style="font-size:10pt;font-family:'verdana' ,">Lene Fischer</span></p>
<p><span style="font-size:10pt;font-family:'verdana' ,"> </span></p>
<p><b><span style="font-size:10pt;font-family:'tahoma' ,">Fra:</span></b><span style="font-size:10pt;font-family:'tahoma' ,"> 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</span></p>
<p> </p>
<p>Hi,</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? </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.</p>
<p>Hope this help!<br />
Nicolas</p>
<div>
<p>On Apr 17, 2016 8:22 AM, "Lene Fischer [via OSGeo.org]" <<a href="/user/SendEmail.jtp?type=node&node=5261625&i=0">[hidden email]</a>> wrote:</p>
<div>
<p>Hi,</p>
<p>I´m rehearsing my lectures for tomorrow – and using 2.14.1 on windows.</p>
<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.</p>
<p>I have to go to properties and load to ‘min-max’ actual values before anything happens.</p>
<p> </p>
<p>If I use Properties >Histogram and try to Reset and then ReCompute histogram – nothing happens…</p>
<p> </p>
<p>What do I do wrong?</p>
<p> </p>
<p>A bit distressed – Giving lectures in raster QGIS tomorrow …</p>
<p>Regard</p>
<p>Lene Fischer</p>
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