.TH i.fusion.brovey 1grass "" "GRASS 6.4.4" "Grass User's Manual"
.SH NAME
\fI\fBi.fusion.brovey\fR\fR  - Brovey transform to merge multispectral and high-res panchromatic channels
.SH KEYWORDS
imagery, fusion, Brovey
.SH SYNOPSIS
\fBi.fusion.brovey\fR
.br
\fBi.fusion.brovey help\fR
.br
\fBi.fusion.brovey\fR [\-\fBlqs\fR] \fBms1\fR=\fIstring\fR \fBms2\fR=\fIstring\fR \fBms3\fR=\fIstring\fR \fBpan\fR=\fIstring\fR \fBoutputprefix\fR=\fIstring\fR  [\-\-\fBoverwrite\fR]  [\-\-\fBverbose\fR]  [\-\-\fBquiet\fR] 
.SS Flags:
.IP "\fB\-l\fR" 4m
.br
LANDSAT sensor
.IP "\fB\-q\fR" 4m
.br
QuickBird sensor
.IP "\fB\-s\fR" 4m
.br
SPOT sensor
.IP "\fB\-\-overwrite\fR" 4m
.br
Allow output files to overwrite existing files
.IP "\fB\-\-verbose\fR" 4m
.br
Verbose module output
.IP "\fB\-\-quiet\fR" 4m
.br
Quiet module output
.PP
.SS Parameters:
.IP "\fBms1\fR=\fIstring\fR" 4m
.br
Name of input raster map (green: tm2 | qbird_green | spot1)
.IP "\fBms2\fR=\fIstring\fR" 4m
.br
Name of input raster map (NIR: tm4 | qbird_nir | spot2)
.IP "\fBms3\fR=\fIstring\fR" 4m
.br
Name of input raster map (MIR; tm5 | qbird_red | spot3)
.IP "\fBpan\fR=\fIstring\fR" 4m
.br
Name of input raster map (etmpan | qbird_pan | spotpan)
.IP "\fBoutputprefix\fR=\fIstring\fR" 4m
.br
Name for output raster map prefix (e.g. 'brov')
.PP
.SH DESCRIPTION
\fIi.fusion.brovey\fR performs a Brovey transformation using
three multispectral and the panchromatic satellite image scene 
channels. Three new channels are calculated according to the
formula:
\fC
.DS
.br
                            DN_b1 
.br
    DN_fused = ------------------------------- * DN_pan
.br
                    DN_b1 + DN_b2 + DN_b3
.br
.DE
\fR
The assignment of the channels depends on the satellite.
The module's help text (above) suggests for LANDSAT-7, QuickBird and SPOT.
.SH 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 \fId.rgb\fR or \fIr.composite\fR.
.SH EXAMPLE
Calculation of Brovey fusion map from North Carolina Landsat scene:
\fC
.DS
.br
g.region rast=lsat7_2002_20 \-p
.br
.br
# R, G, B composite at 28.5m 
.br
d.rgb b=lsat7_2002_10 g=lsat7_2002_20 r=lsat7_2002_30
.br
.br
# Brovey fusion
.br
i.fusion.brovey \-l ms1=lsat7_2002_20 ms2=lsat7_2002_40 \(rs
.br
                   ms3=lsat7_2002_50 pan=lsat7_2002_80 \(rs
.br
                   outputprefix=brovey
.br
.br
# display at 14.25m
.br
g.region rast=brovey.blue \-p
.br
d.rgb b=brovey.blue g=brovey.green r=brovey.red
.br
.DE
\fR
Results:
.PP
.br
| 
.br
\fIR, G, B composite of Landsat at 28.5m\fR
| 
.br
\fIR, G, B composite of Landsat Brovey fusion at 14.25m\fR
.br
Colors may be optionally optimized.
.SH SEE ALSO
\fI
i.his.rgb,
i.rgb.his,
d.rgb,
r.composite
\fR
.SH REFERENCES
.RS
.IP
Original Brovey formula reference unknown, probably 
.br
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
.IP
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.
.IP
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)
.RE
.SH AUTHOR
Markus Neteler, ITC-irst, Italy
.PP
\fILast changed: $Date: 2011-11-08 10:42:51 +0100 (Tue, 08 Nov 2011) $\fR
.PP
Full index
.PP
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