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<li class="toctree-l3"><a class="reference internal" href="../boundary/#what-is-boundary-geojson">What is Boundary [GeoJSON]?</a></li>
<li class="toctree-l3"><a class="reference internal" href="../boundary/#when-is-boundary-geojson-appropriate">When is Boundary [GeoJSON] appropriate?</a></li>
<li class="toctree-l3"><a class="reference internal" href="../boundary/#why-would-one-use-boundary-geojson">Why would one use Boundary [GeoJSON]?</a></li>
<li class="toctree-l3"><a class="reference internal" href="../boundary/#how-would-one-create-boundary-geojson">How would one create Boundary [GeoJSON]?</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../boundary/#geojson-io">GeoJSON.io</a></li>
<li class="toctree-l4"><a class="reference internal" href="../boundary/#qgis">QGIS</a></li>
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<li class="toctree-l4"><a class="reference internal" href="../boundary/#true-boundary-geojson-point-cloud">True: <code class="docutils literal notranslate"><span class="pre">--boundary</span> <span class="pre">[GeoJSON]</span></code> - Point Cloud</a></li>
<li class="toctree-l4"><a class="reference internal" href="../boundary/#true-boundary-geojson-orthophoto">True: <code class="docutils literal notranslate"><span class="pre">--boundary</span> <span class="pre">[GeoJSON]</span></code> - Orthophoto</a></li>
<li class="toctree-l4"><a class="reference internal" href="../boundary/#true-boundary-geojson-digital-elevation-model">True: <code class="docutils literal notranslate"><span class="pre">--boundary</span> <span class="pre">[GeoJSON]</span></code> - Digital Elevation Model</a></li>
<li class="toctree-l4"><a class="reference internal" href="../boundary/#true-boundary-geojson-3d-model-textured-mesh">True: <code class="docutils literal notranslate"><span class="pre">--boundary</span> <span class="pre">[GeoJSON]</span></code> - 3D Model/Textured Mesh</a></li>
<li class="toctree-l4"><a class="reference internal" href="../boundary/#false-null">False: <code class="docutils literal notranslate"><span class="pre">null</span></code></a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">build-overviews</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#what-are-overviews">What Are Overviews?</a></li>
<li class="toctree-l3"><a class="reference internal" href="#when-are-overviews-appropriate">When are Overviews appropriate?</a></li>
<li class="toctree-l3"><a class="reference internal" href="#why-would-one-use-overviews">Why would one use Overviews?</a></li>
<li class="toctree-l3"><a class="reference internal" href="#example-images">Example Images</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#true-build-overviews">True: <code class="docutils literal notranslate"><span class="pre">--build-overviews</span></code></a></li>
<li class="toctree-l4"><a class="reference internal" href="#false-null">False: <code class="docutils literal notranslate"><span class="pre">null</span></code></a></li>
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<li class="toctree-l3"><a class="reference internal" href="../camera-lens/#what-are-camera-lens-models">What Are Camera Lens Models?</a></li>
<li class="toctree-l3"><a class="reference internal" href="../camera-lens/#when-are-manual-selections-appropriate">When are manual selections appropriate?</a></li>
<li class="toctree-l3"><a class="reference internal" href="../camera-lens/#why-would-one-use-a-particular-camera-lens-model">Why would one use a particular Camera Lens Model?</a></li>
<li class="toctree-l3"><a class="reference internal" href="../camera-lens/#example-images">Example Images</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../camera-lens/#auto-rectilinear-data"><code class="docutils literal notranslate"><span class="pre">auto</span></code> : Rectilinear Data</a></li>
<li class="toctree-l4"><a class="reference internal" href="../camera-lens/#brown-rectilinear-data"><code class="docutils literal notranslate"><span class="pre">brown</span></code> : Rectilinear Data</a></li>
<li class="toctree-l4"><a class="reference internal" href="../camera-lens/#fisheye-rectilinear-data"><code class="docutils literal notranslate"><span class="pre">fisheye</span></code> : Rectilinear Data</a></li>
<li class="toctree-l4"><a class="reference internal" href="../camera-lens/#perspective-rectilinear-data"><code class="docutils literal notranslate"><span class="pre">perspective</span></code> : Rectilinear Data</a></li>
<li class="toctree-l4"><a class="reference internal" href="../camera-lens/#spherical-rectilinear-data"><code class="docutils literal notranslate"><span class="pre">spherical</span></code> : Rectilinear Data</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../cameras/">cameras</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../cog/#what-are-cloud-optimized-geotiffs-cogs">What Are Cloud Optimized GeoTIFFs (COGs)?</a></li>
<li class="toctree-l3"><a class="reference internal" href="../cog/#when-are-cogs-appropriate">When are COGs appropriate?</a></li>
<li class="toctree-l3"><a class="reference internal" href="../cog/#why-would-one-use-cogs">Why would one use COGs?</a></li>
<li class="toctree-l3"><a class="reference internal" href="../cog/#example-images">Example Images</a><ul>
<li class="toctree-l4"><a class="reference internal" href="../cog/#true-cog">True: <code class="docutils literal notranslate"><span class="pre">--cog</span></code></a></li>
<li class="toctree-l4"><a class="reference internal" href="../cog/#false-null">False: <code class="docutils literal notranslate"><span class="pre">null</span></code></a></li>
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<li class="toctree-l2"><a class="reference internal" href="../orthophoto-kmz/">orthophoto-kmz</a></li>
<li class="toctree-l2"><a class="reference internal" href="../orthophoto-no-tiled/">orthophoto-no-tiled</a></li>
<li class="toctree-l2"><a class="reference internal" href="../orthophoto-png/">orthophoto-png</a></li>
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<section id="build-overviews">
<span id="id1"></span><h1>build-overviews<a class="headerlink" href="#build-overviews" title="Permalink to this heading"></a></h1>
<p>Build orthophoto overviews for faster display in programs such as QGIS. Default: <code class="docutils literal notranslate"><span class="pre">False</span></code></p>
<div class="line-block">
<div class="line">Parameter Type:</div>
<div class="line-block">
<div class="line"><strong>Boolean</strong></div>
</div>
<div class="line">Parameter Domain:</div>
<div class="line-block">
<div class="line">True: <code class="docutils literal notranslate"><span class="pre">--build-overviews</span></code></div>
<div class="line">False: <code class="docutils literal notranslate"><span class="pre">null</span></code></div>
</div>
<div class="line">Parameter Default:</div>
<div class="line-block">
<div class="line">False: <code class="docutils literal notranslate"><span class="pre">null</span></code></div>
</div>
</div>
<hr class="docutils" />
<table class="docutils align-default">
<colgroup>
<col style="width: 40%" />
<col style="width: 60%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Resource</p></th>
<th class="head"><p>Impact</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>CPU</p></td>
<td><p>●●○ | Medium</p></td>
</tr>
<tr class="row-odd"><td><p>GPU</p></td>
<td><p>○○○ | None</p></td>
</tr>
<tr class="row-even"><td><p>HDD</p></td>
<td><p>●●○ | Medium</p></td>
</tr>
<tr class="row-odd"><td><p>RAM</p></td>
<td><p>●●○ | Medium</p></td>
</tr>
<tr class="row-even"><td><p>Time</p></td>
<td><p>●●○ | Medium</p></td>
</tr>
</tbody>
</table>
<hr class="docutils" />
<section id="what-are-overviews">
<h2>What Are Overviews?<a class="headerlink" href="#what-are-overviews" title="Permalink to this heading"></a></h2>
<p>Overviews (sometimes referred to as pyramids) are an optimization that reduce the time it takes to render GeoTIFF files; Larger file-size is the tradeoff for this increased rendering performance.</p>
<p>Overviews are lower-resolution copies of the raster data (Power of two factor [128x128, 256x256, etc]) that are stored either internally or externally in a sidecar.</p>
<p>In the case of OpenDroneMap, the Overviews will always be internal.</p>
</section>
<section id="when-are-overviews-appropriate">
<h2>When are Overviews appropriate?<a class="headerlink" href="#when-are-overviews-appropriate" title="Permalink to this heading"></a></h2>
<p>One would likely want to use Overviews for nearly every instance, with some few (relatively rare) exceptions.</p>
<blockquote>
<div><ul class="simple">
<li><p>Small File Size is paramount</p></li>
<li><p>Reading software does not support internal Overviews</p></li>
</ul>
</div></blockquote>
</section>
<section id="why-would-one-use-overviews">
<h2>Why would one use Overviews?<a class="headerlink" href="#why-would-one-use-overviews" title="Permalink to this heading"></a></h2>
<p>Overviews speed preview of the raster data by allowing the program rendering the raster to choose the closest size pyramid to match the resolution of the display extent that it is being rendered into, potentially saving a significant amount of time retrieving the full-size raster, buffering it, and then downscaling it for display.</p>
<p>In the case of WebODM, Overviews are used to create dynamic tiles for rapid display and navigation of the 2D web map.</p>
</section>
<section id="example-images">
<h2>Example Images<a class="headerlink" href="#example-images" title="Permalink to this heading"></a></h2>
<section id="true-build-overviews">
<h3>True: <code class="docutils literal notranslate"><span class="pre">--build-overviews</span></code><a class="headerlink" href="#true-build-overviews" title="Permalink to this heading"></a></h3>
<figure class="align-default" id="id2">
<img alt="QGIS displaying the generated Overviews" src="https://user-images.githubusercontent.com/19295950/127073339-6b2a0a4f-6ede-4dc1-8da4-5bc9646de304.png" />
<figcaption>
<p><span class="caption-text">The Layer Properties panel demonstrates that this OpenDroneMap-generated GeoTIFF has internal Overviews.</span><a class="headerlink" href="#id2" title="Permalink to this image"></a></p>
</figcaption>
</figure>
</section>
<section id="false-null">
<h3>False: <code class="docutils literal notranslate"><span class="pre">null</span></code><a class="headerlink" href="#false-null" title="Permalink to this heading"></a></h3>
<figure class="align-default" id="id3">
<img alt="QGIS displaying the file is lacking Overviews" src="https://user-images.githubusercontent.com/19295950/127074349-a3f84c4c-d05c-4bf1-bd7c-790781ad0fe3.png" />
<figcaption>
<p><span class="caption-text">The Layer Properties panel demonstrates that this OpenDroneMap-generated GeoTIFF lacks internal Overviews.</span><a class="headerlink" href="#id3" title="Permalink to this image"></a></p>
</figcaption>
</figure>
<p><a class="reference external" href="https://github.com/opendronemap/docs#how-to-make-your-first-contribution">Learn to edit</a> and help improve <a class="reference external" href="https://github.com/OpenDroneMap/docs/blob/publish/source/arguments_edit/build-overviews.rst">this page</a>!</p>
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