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<title>GRASS GIS: i.fusion.brovey</title>
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<h2>NAME</h2>
<em><b>i.fusion.brovey</b></em> - Brovey transform to merge multispectral and high-res panchromatic channels
<h2>KEYWORDS</h2>
raster, imagery, fusion
<h2>SYNOPSIS</h2>
<b>i.fusion.brovey</b><br>
<b>i.fusion.brovey help</b><br>
<b>i.fusion.brovey</b> [-<b>lqs</b>] <b>ms1</b>=<em>string</em> <b>ms2</b>=<em>string</em> <b>ms3</b>=<em>string</em> <b>pan</b>=<em>string</em> <b>outputprefix</b>=<em>string</em> [--<b>overwrite</b>] [--<b>verbose</b>] [--<b>quiet</b>]
<h3>Flags:</h3>
<DL>
<DT><b>-l</b></DT>
<DD>sensor: LANDSAT</DD>
<DT><b>-q</b></DT>
<DD>sensor: QuickBird</DD>
<DT><b>-s</b></DT>
<DD>sensor: SPOT</DD>
<DT><b>--overwrite</b></DT>
<DD>Allow output files to overwrite existing files</DD>
<DT><b>--verbose</b></DT>
<DD>Verbose module output</DD>
<DT><b>--quiet</b></DT>
<DD>Quiet module output</DD>
</DL>
<h3>Parameters:</h3>
<DL>
<DT><b>ms1</b>=<em>string</em></DT>
<DD>raster input map (green: tm2 | qbird_green | spot1)</DD>
<DT><b>ms2</b>=<em>string</em></DT>
<DD>raster input map (NIR: tm4 | qbird_nir | spot2)</DD>
<DT><b>ms3</b>=<em>string</em></DT>
<DD>raster input map (MIR; tm5 | qbird_red | spot3)</DD>
<DT><b>pan</b>=<em>string</em></DT>
<DD>raster input map (etmpan | qbird_pan | spotpan)</DD>
<DT><b>outputprefix</b>=<em>string</em></DT>
<DD>raster output map prefix (e.g. 'brov')</DD>
</DL>
<H2>DESCRIPTION</H2>
<EM>i.fusion.brovey</EM> performs a Brovey transformation using
three multispectral and the panchromatic satellite image scene
channels. Three new channels are calculated according to the
formula:
<pre>
DN_b1
DN_fused = ------------------------------- * DN_pan
DN_b1 + DN_b2 + DN_b3
</pre>
The assignment of the channels depends on the satellite.
The module's help text (above) suggests for LANDSAT-7, QuickBird and SPOT.
<H2>NOTES</H2>
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 <em>d.rgb</em> or <em>r.composite</em>.
<H2>SEE ALSO</H2>
<EM>
<A HREF="i.his.rgb.html">i.his.rgb</A>,
<A HREF="i.rgb.his.html">i.rgb.his</A>,
<A HREF="d.rgb.html">d.rgb</A>,
<A HREF="r.composite.html">r.composite</A>
</EM>
<H2>REFERENCES</H2>
<ul>
<li>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
<li>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.
<li>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 <a href="http://gisws.media.osaka-cu.ac.jp/grass04/viewabstract.php?id=37">FOSS/GRASS 2004 & GIS-IDEAS 2004</a> (in press)
</ul>
<H2>AUTHOR</H2>
Markus Neteler, ITC-irst
<p><i>Last changed: $Date: 2005-03-02 15:51:25 +0100 (Wed, 02 Mar 2005) $</i>
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