[Qgis-user] no data in raster calculator NDVI
Mariana Buzzi
marianabuzzi86 at gmail.com
Thu Apr 7 10:08:40 PDT 2016
Hi!!!
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.
Thanks!!!
Regards,
Mariana
2016-04-05 12:10 GMT-03:00 Nicolas Cadieux <nicolas.cadieux at archeotec.ca>:
> Hi Marina,
> Please post more information on the exact calculation you are using. This
> could help:
> http://gis.stackexchange.com/questions/103122/how-to-generate-a-ndvi-in-qgis
> Nicolas
>
> Le 2016-04-05 10:34, Mariana Buzzi-2 [via OSGeo.org] a écrit :
>
> Thanks Nicolas!
> But...I check the CSR and It is right. I didn´t work with more than one
> layer...
> Any idea please!???
>
> Regards,
> Mariana
>
> 2016-04-05 10:20 GMT-03:00 Nicolas Cadieux <[hidden email]
> <http:///user/SendEmail.jtp?type=node&node=5259748&i=0>>:
>
>> Hi,
>>
>> 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...
>>
>> You are using more than one layer? Maybe add information on what
>> exactly you are doing. That would help others help you.
>> Cheers!
>>
>> Nicolas
>>
>> Nicolas
>> On Apr 5, 2016 08:45, "Mariana Buzzi-2 [via OSGeo.org] " <[hidden email]
>> <http:///user/SendEmail.jtp?type=node&node=5259730&i=0>> wrote:
>>
>> Hi everybody!!!!
>>
>> 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?
>> Thank you so much!!!!
>>
>> Regards,
>> Mariana
>>
>>
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