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) $

       Full index

       © 2003-2013 GRASS Development Team

GRASS 6.4.3                                                                              i.fusion.brovey(1grass)