<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">GRASS GIS (open source) has several modules for processing raw LiDAR data and the ability to script your own classification routines. &nbsp;LibLAS does a nice job of preprocessing (decoding) the LAS files so they can be input to GRASS as x,y,z or general ASCII format .......see:<div><br></div><div><span class="Apple-style-span" style="font-family: Times; "><pre><a href="http://grass.osgeo.org/wiki/LIDAR#Micro-tutorial">http://grass.osgeo.org/wiki/LIDAR#Micro-tutorial</a></pre></span><div>Stu</div><div><br></div><div><br></div><div><div>On Mar 4, 2011, at 1:31 AM, francesco wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
<div text="#000000" bgcolor="#ffffff">
    Hello List, <br>
    I just registered, hello to everyone. <br>
    Regarding Aaron's question, I am playing around with LibLAS to
    develop a ground classification procedure. It uses Axellson's
    progressive triangulation of local minimum points - but I am also
    looking at other solutions. Does anyone have other interesting
    approaches in mind?<br>
    Cheers,<br>
    Francesco<br>
    <div class="moz-signature">-- <br>
      <font face="Arial, Helvetica, sans-serif" size="-1"> <small>**************************************************<br>
          <b>Francesco Pirotti</b><br>
          Dep. TESAF <br>
          CIRGEO – Interdepartmental Research Center on Cartography
          Photogrammetry <br>
          Remote Sensing and G.I.S. <br>
          University of Padova <br>
          Web: <a href="http://www.cirgeo.unipd.it/cirgeo/francescopirotti.htm">http://www.cirgeo.unipd.it/cirgeo/francescopirotti.htm</a><br>
          Email: <a href="mailto:francesco.pirotti@unipd.it">francesco.pirotti@unipd.it</a><br>
          Phone: +39 049 827 2710 <br>
          Phone: +39 349 55 39 261<br>
          **************************************************
        </small> </font></div>
    <br>
    <br>
    Il 04/03/2011 00:49, Aaron Reyna ha scritto:
    <blockquote cite="mid:AANLkTim1gpLmGvxi-28PWWWjTSvrqdRaBykCbsyAo0o3@mail.gmail.com" type="cite">Ah yes,
      <div><br>
      </div>
      <div>I'll try the MCC-LiDAR. Great, thanks for the suggestion!</div>
      <div><br>
      </div>
      <div>Aaron&nbsp;<br>
        <br>
        <div class="gmail_quote">On Thu, Mar 3, 2011 at 3:09 PM, Peter
          Tittmann <span dir="ltr">&lt;<a moz-do-not-send="true" href="mailto:pwtittmann@ucdavis.edu">pwtittmann@ucdavis.edu</a>&gt;</span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
            0.8ex; border-left: 1px solid rgb(204, 204, 204);
            padding-left: 1ex;">
            <div bgcolor="#ffffff" text="#000000"> I've used MCC-Lidar <a moz-do-not-send="true" href="http://sourceforge.net/apps/trac/mcclidar/" target="_blank">http://sourceforge.net/apps/trac/mcclidar/</a>
              a little with marginal results. Not a great answer but
              something. TeraScan <a moz-do-not-send="true" href="http://www.terrasolid.fi/en/products/terrascan" target="_blank">http://www.terrasolid.fi/en/products/terrascan</a>
              is the elephant in that room.<br>
              <br>
              Peter
              <div>
                <div class="h5"><br>
                  <br>
                  On 03/03/2011 02:43 PM, Aaron Reyna wrote: </div>
              </div>
              <blockquote type="cite">
                <div>
                  <div class="h5">This may be too broad of a question,
                    but has anyone seen or heard of a way to do
                    efficient ground modeling with libLAS? That is, take
                    raw LiDAR files (all&nbsp;default&nbsp;points) and model out
                    the ground class? I do have raw LiDAR files if it
                    helps.
                    <div> <br>
                    </div>
                    <div>Just throwing it out there.</div>
                    <div><br>
                    </div>
                    <div>Best,</div>
                    <div><br>
                    </div>
                    <div>Aaron&nbsp;
                      <div><br>
                      </div>
                      <div><br>
                      </div>
                    </div>
                  </div>
                </div>
                <pre><fieldset></fieldset>
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</pre>
              </blockquote>
              <br>
              <pre cols="72">-- 
Peter Tittmann
Geography Graduate Group
UC Davis
c. 707 849 4135</pre>
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    </blockquote>
    <br>
    <br>
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