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  <div class="section" id="faq">
<span id="id1"></span><h1>FAQ<a class="headerlink" href="#faq" title="Permalink to this headline"></a></h1>
<ul id="index-0">
<li><p class="first">How do you pronounce PDAL?</p>
<p>The proper spelling of the project name is PDAL, in uppercase. It is
pronounced to rhyme with “GDAL”.</p>
</li>
<li><p class="first">Why do I get the error “Couldn’t create … stage of type …”?</p>
<p>In almost all cases this error occurs because you’re trying to run a stage
that is built as a plugin and the plugin (a shared library file or DLL)
can’t be found by pdal.  You can verify whether the plugin can
be found by running “pdal –drivers”</p>
<p>If you’ve built pdal yourself, make sure you’ve requested to build the
plugin in question (set BUILD_PLUGIN_PCL=ON, for example, in CMakeCache.txt).</p>
<p>If you’ve successfully built the plugin, a
shared object called
libpdal_plugin_&lt;plugin type&gt;_&lt;plugin name&gt;.&lt;shared library extension&gt; should
have been created that’s installed in a location where pdal can find it.
pdal will search
the following paths for plugins: “.”, “./lib”, “../lib”, “./bin”, “../bin”.</p>
<p>You can also override the default search path by setting the environment
variable <code class="docutils literal"><span class="pre">PDAL_DRIVER_PATH</span></code> to a list of directories that pdal should search
for plugins.</p>
</li>
<li><p class="first">What is PDAL’s relationship to PCL?</p>
<p>PDAL is PCL’s data translation cousin. PDAL is focused on providing a
declarative pipeline syntax for orchestrating translation operations.
PDAL can also use PCL through the <a class="reference internal" href="stages/filters.pclblock.html#filters-pclblock"><span class="std std-ref">filters.pclblock</span></a> mechanism.
PDAL also supports reading and writing PCL PCD files using <a class="reference internal" href="stages/readers.pcd.html#readers-pcd"><span class="std std-ref">readers.pcd</span></a>
and <a class="reference internal" href="stages/writers.pcd.html#writers-pcd"><span class="std std-ref">writers.pcd</span></a>.</p>
<div class="admonition seealso">
<p class="first admonition-title">See also</p>
<p class="last"><a class="reference internal" href="about.html#about-pcl"><span class="std std-ref">PCL</span></a> describes PDAL and PCL’s relationship.</p>
</div>
</li>
<li><p class="first">What is PDAL’s relationship to libLAS?</p>
<p>The idea behind libLAS was limited to LIDAR data and basic
manipulation. libLAS was also trying to be partially compatible
with LASlib and LAStools. PDAL, on the other hand, aims to be
a ultimate library and a set of tools for manipulating and processing
point clouds and is easily extensible by its users.</p>
</li>
<li><p class="first">Are there any command line tools in PDAL similar to LAStools?</p>
<p>Yes. The <code class="docutils literal"><span class="pre">pdal</span></code> command provides a wide range of features which go
far beyond basic LIDAR data processing. Additionally, PDAL is licensed
under an open source license (this applies to the whole library and
all command line tools).</p>
<div class="admonition seealso">
<p class="first admonition-title">See also</p>
<p class="last"><a class="reference internal" href="apps/index.html#apps"><span class="std std-ref">Applications</span></a> describes application operations you can
achieve with PDAL.</p>
</div>
</li>
<li><p class="first">Is there any compatibility with libLAS’s LAS Utility Applications or LAStools?</p>
<p>No. The the command line interface was developed from scratch with
focus on usability and readability. You will find that the <code class="docutils literal"><span class="pre">pdal</span></code>
command has several well-organized subcommands such as <code class="docutils literal"><span class="pre">info</span></code>
or <code class="docutils literal"><span class="pre">translate</span></code> (see <a class="reference internal" href="apps/index.html#apps"><span class="std std-ref">Applications</span></a>).</p>
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