3
<em>i.fusion.brovey</em> performs a Brovey transformation using
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three multispectral and the panchromatic satellite image scene
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channels. Three new channels are calculated according to the
10
DN_fused = ------------------------------- * DN_pan
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The assignment of the channels depends on the satellite.
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The module's help text (above) suggests for LANDSAT-7, QuickBird and SPOT.
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The command changes temporarily to the high resolution of the
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panchromatic channels for creating the three output channels,
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then restores the previous region settings. The current
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region coordinates are respected. The three pan-sharpened output
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channels may be combined with <em>d.rgb</em> or <em>r.composite</em>.
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Calculation of Brovey fusion map from North Carolina Landsat scene:
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<div class="code"><pre>
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g.region rast=lsat7_2002_20 -p
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# R, G, B composite at 28.5m
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d.rgb b=lsat7_2002_10 g=lsat7_2002_20 r=lsat7_2002_30
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i.fusion.brovey -l ms1=lsat7_2002_20 ms2=lsat7_2002_40 \
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ms3=lsat7_2002_50 pan=lsat7_2002_80 \
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g.region rast=brovey.blue -p
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d.rgb b=brovey.blue g=brovey.green r=brovey.red
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<img src="rgb_originals.jpg" alt="R, G, B composite of Landsat at 28.5m">
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<i>R, G, B composite of Landsat at 28.5m</i>
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<img src="rgb_brovey.jpg" alt="R, G, B composite of Landsat Brovey fusion at 14.25m">
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<i>R, G, B composite of Landsat Brovey fusion at 14.25m</i>
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Colors may be optionally optimized.
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<a href="i.his.rgb.html">i.his.rgb</a>,
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<a href="i.rgb.his.html">i.rgb.his</a>,
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<a href="d.rgb.html">d.rgb</a>,
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<a href="r.composite.html">r.composite</a>
89
<li>Original Brovey formula reference unknown, probably <br>
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Roller, N.E.G. and Cox, S., 1980. Comparison of Landsat MSS
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and merged MSS/RBV data for analysis of natural vegetation.
92
Proc. of the 14th International Symposium on Remote Sensing
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of Environment, San Jose, Costa Rica, 23-30 April, pp. 1001-1007
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<li>Pohl, C., and J.L. van Genderen, 1998.
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Multisensor image fusion in remote sensing: concepts, methods and
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application. Int. J. of Rem. Sens., 19, 823-854.
99
<li>M. Neteler, D. Grasso, I. Michelazzi, L. Miori, S. Merler, and C.
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An integrated toolbox for image registration, fusion and classification.
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International Journal of Geoinformatics, 1(1):51-61
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(<a href="http://www.grassbook.org/neteler/papers/neteler2005_IJG_051-061_draft.pdf">PDF</a>)
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Markus Neteler, ITC-irst, Italy
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<i>Last changed: $Date: 2011-11-08 10:42:51 +0100 (Tue, 08 Nov 2011) $</i>