[GRASS-user] Confused when using i.fusion.brovey

[Kevin]

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 <neteler at osgeo.org> wrote:

> On Mon, Jun 16, 2014 at 3:55 PM, Johan de Braak
> <johan_debraak at hotmail.com> 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
> grass-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/grass-user/attachments/20141104/8c090c20/attachment.html>