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 <[email protected]>: > 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 >> >> >> _______________________________________________ >> Qgis-user mailing list >> <a >> href="/user/SendEmail.jtp?type=node&node=5259726&i=0">[hidden >> email] >> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user >> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user >> >> ------------------------------ >> If you reply to this email, your message will be added to the discussion >> below: >> >> http://osgeo-org.1560.x6.nabble.com/no-data-in-raster-calculator-NDVI-tp5259726.html >> To start a new topic under Quantum GIS - User, email [hidden email] >> <http:///user/SendEmail.jtp?type=node&node=5259748&i=1> >> To unsubscribe from Quantum GIS - User, <a href="<a >> class="moz-txt-link-freetext" >> href="http://osgeo-org.1560.x6.nabble.com/template/NamlServlet.jtp?macro&#61;unsubscribe_by_code&amp;node&#61;4125267&amp;code&#61;bmljb2xhcy5jYWRpZXV4QGFyY2hlb3RlYy5jYXw0MTI1MjY3fDYzNDQ4MjQxNg&#61;&#61";>http://osgeo-org.1560.x6.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=4125267&code=bmljb2xhcy5jYWRpZXV4QGFyY2hlb3RlYy5jYXw0MTI1MjY3fDYzNDQ4MjQxNg== >> <http://osgeo-org.1560.x6.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node&%2361;4125267&code&%2361;bmljb2xhcy5jYWRpZXV4QGFyY2hlb3RlYy5jYXw0MTI1MjY3fDYzNDQ4MjQxNg&%2361;&%2361>;">click >> here. >> <a href=" >> http://osgeo-org.1560.x6.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml >> <http://osgeo-org.1560.x6.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id&%2361;instant_html%21nabble%3Aemail.naml&base&%2361;nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs&%2361;notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>" >> style="font:9px serif">NAML >> >> >> ------------------------------ >> View this message in context: Re: no data in raster calculator NDVI >> <http://osgeo-org.1560.x6.nabble.com/no-data-in-raster-calculator-NDVI-tp5259726p5259730.html> >> Sent from the Quantum GIS - User mailing list archive >> <http://osgeo-org.1560.x6.nabble.com/Quantum-GIS-User-f4125267.html> at >> Nabble.com. >> >> _______________________________________________ >> Qgis-user mailing list >> [hidden email] <http:///user/SendEmail.jtp?type=node&node=5259748&i=2> >> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user >> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user >> > > > _______________________________________________ > Qgis-user mailing list > [hidden email] <http:///user/SendEmail.jtp?type=node&node=5259748&i=3> > List info: http://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user > > ------------------------------ > If you reply to this email, your message will be added to the discussion > below: > > http://osgeo-org.1560.x6.nabble.com/no-data-in-raster-calculator-NDVI-tp5259726p5259748.html > To start a new topic under Quantum GIS - User, email [hidden email] > <http:///user/SendEmail.jtp?type=node&node=5259755&i=0> > To unsubscribe from Quantum GIS - User, click here. > NAML > <http://osgeo-org.1560.x6.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> > > > > ------------------------------ > View this message in context: Re: no data in raster calculator NDVI > <http://osgeo-org.1560.x6.nabble.com/no-data-in-raster-calculator-NDVI-tp5259726p5259755.html> > Sent from the Quantum GIS - User mailing list archive > <http://osgeo-org.1560.x6.nabble.com/Quantum-GIS-User-f4125267.html> at > Nabble.com. > > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: http://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user >
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