Dear Mariana, If You have the tif files, you do not have to merge the bands, you just only need these files. Otherwise, maybe (if the images do not have 8 bit format, but you will see when DDVI values will have non-regular values, i.e. outside the -1-+1 range) you have to apply an atmospheric correction (I had to ...) with the TOA plugin in QGIS. In this case you need the *.met file for the correction, too.
Kind regards, Szilard 2014-06-18 19:43 GMT+02:00 Mariana Buzzi <marianabuzz...@gmail.com>: > Dear QGIS users, > > I wanted to consult on the calculation of NDVI with Landsat 8. I Download > a USGS Landsat image 8, so I have all the bands that make up the image. The > question is: should I perform a "merge" with the bands 4 and 5 and then > calculate the NDVI with the raster calculator? How should I do it? > > Of course, thank you very much! > > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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