NAME

       i.fusion.brovey   -  Brovey  transform  to  merge  multispectral and high-res panchromatic
       channels

KEYWORDS

       imagery, fusion, Brovey

SYNOPSIS

       i.fusion.brovey
       i.fusion.brovey help
       i.fusion.brovey [-lqs] ms1=string  ms2=string  ms3=string  pan=string  outputprefix=string
       [--overwrite]  [--verbose]  [--quiet]

   Flags:
       -l
           LANDSAT sensor

       -q
           QuickBird sensor

       -s
           SPOT sensor

       --overwrite
           Allow output files to overwrite existing files

       --verbose
           Verbose module output

       --quiet
           Quiet module output

   Parameters:
       ms1=string
           Name of input raster map (green: tm2 | qbird_green | spot1)

       ms2=string
           Name of input raster map (NIR: tm4 | qbird_nir | spot2)

       ms3=string
           Name of input raster map (MIR; tm5 | qbird_red | spot3)

       pan=string
           Name of input raster map (etmpan | qbird_pan | spotpan)

       outputprefix=string
           Name for output raster map prefix (e.g. 'brov')

DESCRIPTION

       i.fusion.brovey  performs  a  Brovey  transformation  using  three  multispectral  and the
       panchromatic satellite image scene channels. Three new channels are  calculated  according
       to the formula:
                                   DN_b1
           DN_fused = ------------------------------- * DN_pan
                           DN_b1 + DN_b2 + DN_b3
         The assignment of the channels depends on the satellite.  The module's help text (above)
       suggests for LANDSAT-7, QuickBird and SPOT.

NOTES

       The command changes temporarily to the high resolution of the  panchromatic  channels  for
       creating  the  three  output  channels,  then  restores  the previous region settings. The
       current region coordinates are respected. The three pan-sharpened output channels  may  be
       combined with d.rgb or r.composite.

EXAMPLE

       Calculation of Brovey fusion map from North Carolina Landsat scene:
       g.region rast=lsat7_2002_20 -p
       # R, G, B composite at 28.5m
       d.rgb b=lsat7_2002_10 g=lsat7_2002_20 r=lsat7_2002_30
       # Brovey fusion
       i.fusion.brovey -l ms1=lsat7_2002_20 ms2=lsat7_2002_40 \
                          ms3=lsat7_2002_50 pan=lsat7_2002_80 \
                          outputprefix=brovey
       # display at 14.25m
       g.region rast=brovey.blue -p
       d.rgb b=brovey.blue g=brovey.green r=brovey.red
        Results:

       |
       R, G, B composite of Landsat at 28.5m |
       R, G, B composite of Landsat Brovey fusion at 14.25m
       Colors may be optionally optimized.

SEE ALSO

        i.his.rgb, i.rgb.his, d.rgb, r.composite

REFERENCES

                     Original Brovey formula reference unknown, probably
                     Roller,  N.E.G.  and  Cox,  S.,  1980.  Comparison of Landsat MSS and merged
                     MSS/RBV data  for  analysis  of  natural  vegetation.   Proc.  of  the  14th
                     International  Symposium  on  Remote Sensing of Environment, San Jose, Costa
                     Rica, 23-30 April, pp. 1001-1007

                     Pohl, C., and J.L. van Genderen, 1998.  Multisensor image fusion  in  remote
                     sensing:  concepts,  methods  and  application.  Int.  J. of Rem. Sens., 19,
                     823-854.

                     M.  Neteler,  D.  Grasso,  I.  Michelazzi,  L.  Miori,  S.  Merler,  and  C.
                     Furlanello,  2005.  An integrated toolbox for image registration, fusion and
                     classification.  International Journal of Geoinformatics, 1(1):51-61 (PDF)

AUTHOR

       Markus Neteler, ITC-irst, Italy

       Last changed: $Date: 2011-11-08 01:42:51 -0800 (Tue, 08 Nov 2011) $

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       © 2003-2013 GRASS Development Team