NAME
i.fusion.brovey  - Brovey transform to merge multispectral and high-res panchromatic channels
SYNOPSIS
i.fusion.brovey
i.fusion.brovey help
i.fusion.brovey [-lqs] ms1=string ms2=string ms3=string pan=string outputprefix=string 
Flags:
- -l
 - sensor: LANDSAT
 
- -q
 - sensor: QuickBird
 
- -s
 - sensor: SPOT
 
Parameters:
- ms1=string
 - raster input map (green: tm2 | qbird_green | spot1)
 
- ms2=string
 - raster input map (NIR: tm4 | qbird_nir | spot2)
 
- ms3=string
 - raster input map (MIR; tm5 | qbird_red | spot3)
 
- pan=string
 - raster input map (etmpan | qbird_pan | spotpan)
 
- outputprefix=string
 - raster output 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.
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, Special Issue
   on FOSS/GRASS 2004 & GIS-IDEAS 2004 (in press)
 
AUTHOR
Markus Neteler, ITC-irst
Last changed: $Date: 2005/03/02 14:51:25 $
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