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<title>GRASS GIS manual: r.external</title>
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<h2>NAME</h2>
<em><b>r.external</b></em> - Link GDAL supported raster file to a binary raster map layer.
<h2>KEYWORDS</h2>
raster, import
<h2>SYNOPSIS</h2>
<b>r.external</b><br>
<b>r.external help</b><br>
<b>r.external</b> [-<b>oerf</b>] [<b>input</b>=<em>name</em>] [<b>source</b>=<em>string</em>] [<b>output</b>=<em>name</em>] [<b>band</b>=<em>integer</em>] [<b>title</b>=<em>"phrase"</em>] [--<b>overwrite</b>] [--<b>verbose</b>] [--<b>quiet</b>]
<h3>Flags:</h3>
<DL>
<DT><b>-o</b></DT>
<DD>Override projection (use location's projection)</DD>
<DT><b>-e</b></DT>
<DD>Extend region extents based on new dataset</DD>
<DD>Also updates the default region if in the PERMANENT mapset</DD>
<DT><b>-r</b></DT>
<DD>Require exact range</DD>
<DT><b>-f</b></DT>
<DD>List supported formats and exit</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>input</b>=<em>name</em></DT>
<DD>Raster file to be linked</DD>
<DT><b>source</b>=<em>string</em></DT>
<DD>Name of non-file GDAL data source</DD>
<DT><b>output</b>=<em>name</em></DT>
<DD>Name for output raster map</DD>
<DT><b>band</b>=<em>integer</em></DT>
<DD>Band to select (default: all)</DD>
<DT><b>title</b>=<em>"phrase"</em></DT>
<DD>Title for resultant raster map</DD>
</DL>
<h2>DESCRIPTION</h2>
<em>r.external</em> allows a user to link a GDAL supported raster file to a binary
raster map layer, from any GDAL supported raster map format, with an optional
title. The file is not imported but just registered as GRASS raster map.
<h2>EXAMPLES</h2>
<h3>RGB Orthophoto from GeoTIFF</h3>
<div class="code"><pre>
# import of all channels:
r.external /home/user/data/maps/059100.tif out=ortho
g.region rast=ortho.3 -p
d.rgb r=ortho.1 g=ortho.2 b=ortho.3
r.composite r=ortho.1 g=ortho.2 b=ortho.3 output=ortho.rgb
</pre></div>
<h2>SEE ALSO</h2>
<em>
<a href="r.in.gdal.html">r.in.gdal</a>,
<a href="v.external.html">v.external</a>
</em>
<h2>REFERENCES</h2>
GDAL Pages: <a href="http://www.gdal.org">http://www.gdal.org/</a><br>
<h2>AUTHOR</h2>
Glynn Clements
<p>
<i>Last changed: $Date: 2011-06-03 09:42:11 -0700 (Fri, 03 Jun 2011) $</i>
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