Geografic-Information-System/scripts/r.out.xyz/r.out.xyz.html

<h2>DESCRIPTION</h2>

The <em>r.out.xyz</em> module exports a raster map as a list of x,y,z
values into an ASCII text file.

<h2>NOTES</h2>

This module will by default not export x,y coordinates for raster cells
containing a NULL value. This includes cells masked by a raster MASK.
Using the flag <b>-i</b> also these raster cells will be included in the
exported data.
<p>
This module, as all GRASS raster modules, will export cells based on the
current region settings. See the <em>g.region</em> module for details.
<p>
The <em>r.out.ascii</em> module should be used to export an array (of
size row x column) containing z values.
<p>
<em>r.out.xyz</em> can combine several input raster maps, which can be 
convenient when it comes to e.g. produce ASCII point cloud files.
<p>
<em>r.out.xyz</em> is simply a front-end to "<tt>r.stats -1g[n]</tt>".

<h2>EXAMPLES</h2>

In this example, a LiDAR elevation map in the
North Carolina sample dataset location is exported to CSV format.

<div class="code"><pre>
g.region raster=elev_lid792_1m -p
r.out.xyz input=elev_lid792_1m output=elev_lid792_1m.csv separator=","
</pre></div>

<p>
In this example, elevation data from the North Carolina dataset are
exported along with R,G,B triplet of the related orthophoto into a
combined file (requires the import of the supplementary high-resolution
<a href="http://grass.osgeo.org/sampledata/north_carolina/ortho2010_t792_subset_20cm.tif">color orthophoto</a>, here called "ortho2010_t792"):

<div class="code"><pre>
g.region raster=elev_lid792_1m res=1 -a -p
r.out.xyz input=elev_lid792_1m,ortho2010_t792.red,ortho2010_t792.green,ortho2010_t792.blue \
        separator=space output=pointcloud.asc

# validate: X Y Z R G B
head -n 3 pointcloud.asc
638300.5 220749.5 126.338218689 78 84 71
638301.5 220749.5 126.3381958008 93 101 86
638302.5 220749.5 126.3414840698 68 77 59
</pre></div>

<h2>TODO</h2>

Implement this script as a <em>r.out.ascii</em> option?


<h2>SEE ALSO</h2>

<em>
<a href="g.region.html">g.region</a>,
<a href="r.mask.html">r.mask</a>
<a href="r.out.ascii.html">r.out.ascii</a>,
<a href="r.stats.html">r.stats</a>
</em>

<h2>AUTHOR</h2>

M. Hamish Bowman<br>
<i>Dept. Marine Science<br>
Otago University, New Zealand</i>

<p><i>Last changed: $Date$</i>