<HTML>
<HEAD>
<TITLE>Re: [Liblas-devel] Ground Modeling with RAW LiDAR and libLAS</TITLE>
</HEAD>
<BODY>
<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:10pt'>I second Howard’s request for direct support for LAS in GRASS.<BR>
<BR>
The ISU Boise Center Aerospace Lab has a lidar ground modeling tool in their BCAL Lidar Tools package for ENVI (<a href="http://bcal.geology.isu.edu/Envitools.shtml">http://bcal.geology.isu.edu/Envitools.shtml</a>). The Height Filtering tool is optimized for the open </SPAN></FONT><SPAN STYLE='font-size:10pt'><FONT FACE="Arial">rangeland vegetation (sagebrush) common in the American west. The code is written in IDL and available via Google Code (<a href="http://code.google.com/p/bcal-lidar-tools/">http://code.google.com/p/bcal-lidar-tools/</a>). <BR>
<BR>
More info on the height filtering approach is in:<BR>
Streutker, D. and Glenn, N., 2006. LiDAR measurement of sagebrush steppe vegetation heights. Remote Sensing of Environment, 102, 135-145. (<a href="http://bcal.geology.isu.edu/manuscripts/Streutker_2006_RSE.pdf">http://bcal.geology.isu.edu/manuscripts/Streutker_2006_RSE.pdf</a>)<BR>
<BR>
-Chris <BR>
</FONT><FONT FACE="Calibri, Verdana, Helvetica, Arial"><BR>
--<BR>
Christopher Crosby<BR>
Project Manager, OpenTopography Facility<BR>
<BR>
San Diego Supercomputer Center<BR>
University of California, San Diego, MC 0505 <BR>
9500 Gilman Drive<BR>
La Jolla, CA 92093-0505<BR>
<BR>
858.822.5458<BR>
<a href="ccrosby@sdsc.edu">ccrosby@sdsc.edu</a><BR>
<a href="http://www.opentopography.org">http://www.opentopography.org</a><BR>
<BR>
<BR>
On [Mar/4] 6:27 AM, "Howard Butler" <<a href="hobu.inc@gmail.com">hobu.inc@gmail.com</a>> wrote:<BR>
<BR>
</FONT></SPAN><BLOCKQUOTE><SPAN STYLE='font-size:10pt'><FONT FACE="Calibri, Verdana, Helvetica, Arial"><BR>
<BR>
On Mar 4, 2011, at 8:29 AM, francesco wrote:<BR>
<BR>
> I use GRASS quite a lot, but always thought that it would be slow on vector points. I know Brovelli and her team developed some modules, I'll check on that. Good idea to use LibLAS as "driver" to turn LAS to xyz.<BR>
<BR>
It would be much, much, much faster if someone wrote some glue between libLAS and GRASS (proposed here quite a while ago, but still not done <<a href="http://lists.osgeo.org/pipermail/grass-dev/2008-May/037687.html>">http://lists.osgeo.org/pipermail/grass-dev/2008-May/037687.html></a>). I would guess it would be an order of magnitude faster to ingest data if you didn't have to go through text formats to do it.<BR>
<BR>
And, for this LiDAR idiot. What is ground modeling?<BR>
<BR>
Thanks,<BR>
<BR>
Howard_______________________________________________<BR>
Liblas-devel mailing list<BR>
<a href="Liblas-devel@lists.osgeo.org">Liblas-devel@lists.osgeo.org</a><BR>
<a href="http://lists.osgeo.org/mailman/listinfo/liblas-devel">http://lists.osgeo.org/mailman/listinfo/liblas-devel</a><BR>
<BR>
</FONT></SPAN></BLOCKQUOTE>
</BODY>
</HTML>