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Hi Marina,<br>
Please post more information on the exact calculation you are using.
This could help:
<a class="moz-txt-link-freetext" href="http://gis.stackexchange.com/questions/103122/how-to-generate-a-ndvi-in-qgis" target="_top" rel="nofollow" link="external">http://gis.stackexchange.com/questions/103122/how-to-generate-a-ndvi-in-qgis</a><br>
Nicolas<br>
<br>
<div class="moz-cite-prefix">Le 2016-04-05 10:34, Mariana Buzzi-2
[via OSGeo.org] a écrit :<br>
</div>
<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em'
cite="mid:CAJkiiNfaWF2SiwBOkj3VXmDQyDugB5Dz+JftOtdVTyRmiDSYBA@mail.gmail.com"
type="cite">
<div dir="ltr">Thanks Nicolas!
<div>But...I check the CSR and It is right. I didn´t work with
more than one layer...</div>
<div>Any idea please!???</div>
<div><br>
</div>
<div>Regards,</div>
<div>Mariana</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">2016-04-05 10:20 GMT-03:00 Nicolas
Cadieux <span dir="ltr"><<a moz-do-not-send="true"
href="/user/SendEmail.jtp?type=node&node=5259748&i=0"
target="_top" rel="nofollow" link="external">[hidden
email]</a>></span>:<br>
<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' style="border-left:2px solid #CCCCCC;padding:0
1em" class="gmail_quote">
<p dir="ltr">Hi,</p>
<p dir="ltr">I don't use NDVI raster calculation but if you
have no data values where you thinks you have some data,
then my first reaction would be to see if all the layers
are in the same CRS in case the plugin does not
reprojection on the fly... </p>
<p dir="ltr"> You are using more than one layer? Maybe add
information on what exactly you are doing. That would
help others help you.<br>
Cheers!</p>
<p dir="ltr">Nicolas<br>
</p>
<p dir="ltr">Nicolas</p>
<div class="gmail_quote">
<div>
<div class="h5">On Apr 5, 2016 08:45, "Mariana Buzzi-2
[via OSGeo.org] " <<a moz-do-not-send="true"
href="http:///user/SendEmail.jtp?type=node&node=5259730&i=0" rel="nofollow" link="external" target="_blank">[hidden
email]</a>> wrote:<br type="attribution">
</div>
</div>
<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' style="border-left:2px solid #CCCCCC;padding:0
1em">
<div>
<div class="h5">
<div dir="ltr">Hi everybody!!!!
<div><br>
</div>
<div>
<div>I'm doing a calculation with NDVI raster
calculator. When I generate the calculation
results I get a lot of pixels without values
(no data). How I can do to fill those values
with data?</div>
<div>Thank you so much!!!!</div>
<div><br>
</div>
<div>Regards,</div>
<div>Mariana</div>
</div>
<div><br>
</div>
</div>
<br>
</div>
</div>
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