<div dir="ltr">Hi!!!<div>I am working with SPOT 5 image. First I transforme the image with TOA plugin, and with datas I did the NDVI.To perform the calculation of NDVI I use the raster calculator. In QGIS v. 2.8.3. From the Raster tool -> Raster calculator. And there select the appropriate bands for the calculation (NIR-R / NIR + R). The output file generated is a geotiff, which has a large number of pixels no data (no data). Therefore I would like to know why this occurs and how I can do about it.</div><div>Thanks!!!</div><div><br></div><div>Regards,</div><div>Mariana</div></div><div class="gmail_extra"><br><div class="gmail_quote">2016-04-05 12:10 GMT-03:00 Nicolas Cadieux <span dir="ltr"><<a href="mailto:nicolas.cadieux@archeotec.ca" target="_blank">nicolas.cadieux@archeotec.ca</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Marina,<br>
Please post more information on the exact calculation you are using.
This could help:
<a href="http://gis.stackexchange.com/questions/103122/how-to-generate-a-ndvi-in-qgis" rel="nofollow" link="external" target="_blank">http://gis.stackexchange.com/questions/103122/how-to-generate-a-ndvi-in-qgis</a><br>
Nicolas<span class=""><br>
<br>
<div>Le 2016-04-05 10:34, Mariana Buzzi-2
[via OSGeo.org] a écrit :<br>
</div>
</span><blockquote style="border-left:2px solid #cccccc;padding:0 1em" type="cite"><span class="">
<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>
</span><div class="gmail_extra"><br>
<div class="gmail_quote"><span class="">2016-04-05 10:20 GMT-03:00 Nicolas
Cadieux <span dir="ltr"><<a href="http:///user/SendEmail.jtp?type=node&node=5259748&i=0" rel="nofollow" link="external" target="_blank">[hidden
email]</a>></span>:<br>
</span><blockquote style="border-left:2px solid #cccccc;padding:0 1em" class="gmail_quote"><span class="">
<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>
</span><div class="gmail_quote"><span class="">
<div>
<div>On Apr 5, 2016 08:45, "Mariana Buzzi-2
[via OSGeo.org] " <<a 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>
</span><blockquote style="border-left:2px solid #cccccc;padding:0 1em"><span class="">
<div>
<div>
<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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