<br><font size=2 face="sans-serif">I generally use las2txt to create the
text files ( x,y,z,intrensity,number of returns, return number) and
then aggregate all of the text files to a single file and use r.in.xyz
in grass. With r.in.xyz, you can designate which colums are x, y,
znd z. For intensities, I use the x,y values and use the intensity
value as the z value, preforming a mean statistic on the intensity values
in each cell . I have done this with text files up to 140 GB
in size. Recently, I have been filtering by return number to get
the mean intensities of the last returns to try to help determine moist
soil/wetland footprints.</font>
<br>
<br><font size=2 face="sans-serif">Email me directly and I can send
a couple of screenshots.</font>
<br>
<br>
<br><font size=2 face="sans-serif">Doug</font>
<br>
<br><font size=2 face="sans-serif">Doug Newcomb
<br>
USFWS<br>
Raleigh, NC<br>
919-856-4520 ext. 14 doug_newcomb@fws.gov<br>
---------------------------------------------------------------------------------------------------------<br>
The opinions I express are my own and are not representative of the official
policy of the U.S.Fish and Wildlife Service or Dept. of the Interior.
Life is too short for undocumented, proprietary data formats.</font>
<br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td width=40%><font size=1 face="sans-serif"><b>Peter Tittmann <pwtittmann@ucdavis.edu></b>
</font>
<br><font size=1 face="sans-serif">Sent by: liblas-devel-bounces@lists.osgeo.org</font>
<p><font size=1 face="sans-serif">04/22/2011 10:35 PM</font>
<td width=59%>
<table width=100%>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">Aaron Reyna <aaron.reyna@gmail.com></font>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">cc</font></div>
<td><font size=1 face="sans-serif">liblas-devel@lists.osgeo.org</font>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: [Liblas-devel] Intensity Images
with GDAL and liblas</font></table>
<br>
<table>
<tr valign=top>
<td>
<td></table>
<br></table>
<br>
<br>
<br><font size=3>If you are looking for gridded intensity rasters you could
use grass. It would be similar to creating a DEM. Theres an example here
</font><a href=http://www.locuscor.net/wordpress/><font size=3>http://www.locuscor.net/wordpress/
of piping the output of las2txt. You'll need to switch references around
to refer grass to the intensity value.</font></a>
<br>
<br><font size=3>Peter<br>
<br>
-- <br>
Peter Tittmann<br>
UC Davis</font>
<br><font size=3>Geography Graduate Group</font>
<br>
<p><font size=3 color=#a2a2a2>On Friday, April 22, 2011 at 4:35 PM, Aaron
Reyna wrote:</font>
<p><font size=3>anyone know how to kick out intensity images with libalas
and GDAL. Not directly looking for code, but it's a problem I'm standing
in front of right now.</font>
<br>
<br><font size=3>Any help is much appreciated.</font>
<br>
<br><font size=3>Aaron</font>
<br><font size=3>_______________________________________________<br>
Liblas-devel mailing list</font><font size=3 color=blue><u><br>
</u></font><a href="mailto:Liblas-devel@lists.osgeo.org"><font size=3 color=blue><u>Liblas-devel@lists.osgeo.org</u></font></a><font size=3 color=blue><u><br>
</u></font><a href="http://lists.osgeo.org/mailman/listinfo/liblas-devel"><font size=3 color=blue><u>http://lists.osgeo.org/mailman/listinfo/liblas-devel</u></font></a>
<br><tt><font size=2>_______________________________________________<br>
Liblas-devel mailing list<br>
Liblas-devel@lists.osgeo.org<br>
</font></tt><a href="http://lists.osgeo.org/mailman/listinfo/liblas-devel"><tt><font size=2>http://lists.osgeo.org/mailman/listinfo/liblas-devel<br>
</font></tt></a>
<br>