For your information - For rapid band combinations and pan-sharpening of the latest Landsat-8 satellite imagery, you may take a look at the free and advanced image fusion software from GeoSage.
The software with 2 simple button clicks: http://www.geosage.com/highview/features_landsat8.html If you have the latest QGIS installed, click the 3rd button for GeoTFF -> KMZ conversion. Hope this helps. On Wed, Jun 18, 2014 at 6:44 AM, Markus Neteler <[email protected]> wrote: > On Mon, Jun 16, 2014 at 3:55 PM, Johan de Braak > <[email protected]> wrote: > > Dear all, > > > > I have used i.fusion.brovey to transform a Landsat 8 image (6 bands) to a > > cell size of 15x15. I have 3 questions regarding this tool: > > > > 1. Is the output reliable if I run this tool twice to convert all 6 > bands? > > If not, what should I do to transform 6 bands with a reliable output? And > > why is it not possible to specify more than three bands? > > The Brovey transform has been defined for using three multispectral > and the panchromatic bands: > http://grass.osgeo.org/grass64/manuals/i.fusion.brovey.html > > That's how it was developed and suggested in Roller, N.E.G. and Cox, S., > 1980. > > > 2. When specifying the input, between brackets is mentioned: green tm2, > NIR > > tm4, MIR tm5. > > Yes, the *input* bands. > > > The files created however are named red green and blue. > > This is how they are commonly assigned to the R/G/B color > visualization tool, i.e. d.rgb. > > > I have assumed that 'ms1' results in 'outputprefix.red', 'ms2' results in > > 'outputprefix.green' and 'ms3' resuls in 'outputprefix.blue'. Is this > > assumption true? Why are the output names different from what is > mentioned > > between brackets in the input? > > Because in the definition of this transform the blue band is not used. > In theory it is up to you which bands you input, in case you will > simply deviate from the original definition. > > > 3. Is it recommended to use this tool before performing a supervised > image > > classification with the output of i.fusion.brovey? > > Personally I would not consider this since it may add correlation > between the bands. > > Please also consider the updated version in GRASS GIS 7: > http://grass.osgeo.org/grass70/manuals/i.pansharpen.html > > And perhaps this page: > http://grasswiki.osgeo.org/wiki/Image_classification > > GRASS GIS 7 comes with new classification software: > http://grass.osgeo.org/grass70/manuals/g.gui.iclass.html > http://grasswiki.osgeo.org/wiki/Image_classification > > Markus > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user >
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