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: 2010-02-12 08:01:24 -0800 (Fri, 12 Feb 2010) $
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