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</li>
<liclass="toctree-l2"><aclass="reference internal"href="../../installation/#basic-commands-and-troubleshooting">Základní příkazy a řešení potíží</a></li>
<liclass="toctree-l2"><aclass="reference internal"href="../../installation/#hello-webodm">Dobrý den, WebODM!</a><ul>
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<liclass="toctree-l2"><aclass="reference internal"href="../../tutorials/#using-potree-3d-viewer-module-on-webodm">Použití modulu Potree 3D viewer na WebODM</a><ul>
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<liclass="toctree-l3"><aclass="reference internal"href="../../faq/#can-i-process-two-or-more-orthophoto-geotiffs-to-stitch-them-together">Mohu zpracovat dva nebo více ortofotografických souborů GeoTIFF a spojit je dohromady?</a></li>
<liclass="toctree-l3"><aclass="reference internal"href="../../faq/#the-software-is-not-using-all-of-my-cpu-cores-memory-gpu-all-of-the-times-is-it-normal">The software is not using all of my CPU cores / memory / GPU all of the times. Is it normal?</a></li>
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<liclass="toctree-l3"><aclass="reference internal"href="../../faq/#i-want-to-build-a-commercial-application-that-includes-odm-do-i-need-a-commercial-license">Chci vytvořit komerční aplikaci, která zahrnuje ODM. Potřebuji komerční licenci?</a></li>
<liclass="toctree-l3"><aclass="reference internal"href="../../faq/#are-there-other-licensing-options-aside-from-the-agplv3">Existují kromě licence AGPLv3 i jiné možnosti licencování?</a></li>
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<h2>What Are Cloud Optimized GeoTIFFs (COGs)?<aclass="headerlink"href="#what-are-cloud-optimized-geotiffs-cogs"title="Permalink to this heading"></a></h2>
<p>Cloud Optimized GeoTIFFs (COGs hereafter) are a special formulation of GeoTIFF files that take advantage of internal overivews as well as tiling (and various forms of compression).</p>
<p>In the case of WebODM, all GeoTIFFs will be generated as COGs because the 2D Map View uses the special attributes of COGs to enable rapid display and preview of the data generated by WebODM.</p>
</section>
<sectionid="when-are-cogs-appropriate">
<h2>When are COGs appropriate?<aclass="headerlink"href="#when-are-cogs-appropriate"title="Permalink to this heading"></a></h2>
<p>COGs are most appropriate when the GeoTIFF is going to be hosted online and/or accessed by a program which can take advantage of HTTP GetRange Requests and/or internal overviews and tiles.</p>
</section>
<sectionid="why-would-one-use-cogs">
<h2>Why would one use COGs?<aclass="headerlink"href="#why-would-one-use-cogs"title="Permalink to this heading"></a></h2>
<p>The COG structure (internal overviews and tiling) allows for rapid viewing of the data in programs which are capable of reading tiled data and overviews (most GIS software [QGIS etc]). This advantage holds true whether or not the file is hosted online and served via HTTP or whether it is stored locally.</p>
<p>With these features in place, a COG should display much more quickly in a given application than a more legacy formatted GeoTIFF with no overviews and striped structure.</p>
</section>
<sectionid="example-images">
<h2>Example Images<aclass="headerlink"href="#example-images"title="Permalink to this heading"></a></h2>
<sectionid="true-cog">
<h3>True: <codeclass="docutils literal notranslate"><spanclass="pre">--cog</span></code><aclass="headerlink"href="#true-cog"title="Permalink to this heading"></a></h3>
<figureclass="align-default"id="id2">
<imgalt="GDAL Info showing LAYOUT=COG"src="https://user-images.githubusercontent.com/19295950/127079824-c85fa5a9-842a-4f28-a380-b6404aac7ef2.png"/>
<figcaption>
<p><spanclass="caption-text">The Raster Information tool in QGIS can print information from gdalinfo which can be used to confirm the conformance of a GeoTIFF to the COG spec.</span><aclass="headerlink"href="#id2"title="Permalink k tomuto obrázku"></a></p>
<p><spanclass="caption-text">The Layer Properties panel can show that there are in fact internal overviews. Keep in mind that not every GeoTIFF has internal overviews, but every COG must.</span><aclass="headerlink"href="#id3"title="Permalink k tomuto obrázku"></a></p>
</figcaption>
</figure>
<figureclass="align-default"id="id4">
<imgalt="QGIS Layer Properties showing an on-disk file size of 8.78 MB"src="https://user-images.githubusercontent.com/19295950/138733095-fb5f07ef-fbb0-48f4-8401-25cbf5294b9d.png"/>
<figcaption>
<p><spanclass="caption-text">Note that the on-disk file size is 8.78 MB for the COG due to the presence of internal overviews when compared to the 6.30 MB of the non-COG GeoTIFF below.</span><aclass="headerlink"href="#id4"title="Permalink k tomuto obrázku"></a></p>
</figcaption>
</figure>
</section>
<sectionid="false-null">
<h3>False: <codeclass="docutils literal notranslate"><spanclass="pre">null</span></code><aclass="headerlink"href="#false-null"title="Permalink to this heading"></a></h3>
<figureclass="align-default"id="id5">
<imgalt="GDAL Info not showing LAYOUT=COG"src="https://user-images.githubusercontent.com/19295950/127080115-7e09ba30-140f-402d-b00a-8bb0c7bc72ff.png"/>
<figcaption>
<p><spanclass="caption-text">The Raster Information tool in QGIS does not show LAYOUT=COG, which indicates that this GeoTIFF does not meet the COG spec.</span><aclass="headerlink"href="#id5"title="Permalink k tomuto obrázku"></a></p>
</figcaption>
</figure>
<figureclass="align-default"id="id6">
<imgalt="QGIS Layer Properties not showing Internal Overviews"src="https://user-images.githubusercontent.com/19295950/138732051-d227c98d-10a5-46de-ac99-8c5ffb0a12b2.png"/>
<figcaption>
<p><spanclass="caption-text">The Layer Properties panel shows that the GeoTIFF lacks all levels of Internal Pyramids.</span><aclass="headerlink"href="#id6"title="Permalink k tomuto obrázku"></a></p>
</figcaption>
</figure>
<figureclass="align-default"id="id7">
<imgalt="QGIS Layer Properties showing an on-disk file size of 6.30 MB"src="https://user-images.githubusercontent.com/19295950/138733132-a9c4f8b4-673a-426b-a665-bde5e89e4de3.png"/>
<figcaption>
<p><spanclass="caption-text">Note that the on-disk file size is 6.30 MB for the COG due to the lack of internal overviews when compared to the 8.78 MB of the COG GeoTIFF above.</span><aclass="headerlink"href="#id7"title="Permalink k tomuto obrázku"></a></p>
</figcaption>
</figure>
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