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<section id="image-geolocation-files">
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<h1>Image Geolocation Files<a class="headerlink" href="#image-geolocation-files" title="Permalink to this headline">露</a></h1>
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<p>By default ODM will use the GPS information embedded in the images, if it is available. Sometimes images do not contain GPS information, or a user wishes to override the information with more accurate data (such as RTK).</p>
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<p>Starting from ODM <code class="docutils literal notranslate"><span class="pre">2.0</span></code> people can supply an image geolocation file (geo) for this purpose.</p>
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<p>The format of the image geolocation file is simple.</p>
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<blockquote>
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<div><ul class="simple">
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<li><p>The first line should contain the name of the projection used for the geo coordinates. This can be specified either as a PROJ string (e.g. <code class="docutils literal notranslate"><span class="pre">+proj=utm</span> <span class="pre">+zone=10</span> <span class="pre">+ellps=WGS84</span> <span class="pre">+datum=WGS84</span> <span class="pre">+units=m</span> <span class="pre">+no_defs</span></code>), EPSG code (e.g. <code class="docutils literal notranslate"><span class="pre">EPSG:4326</span></code>) or as a <code class="docutils literal notranslate"><span class="pre">WGS84</span> <span class="pre">UTM</span> <span class="pre"><zone>[N|S]</span></code> value (eg. <code class="docutils literal notranslate"><span class="pre">WGS84</span> <span class="pre">UTM</span> <span class="pre">16N</span></code>)</p></li>
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<li><p>Subsequent lines are the image filename, X, Y & Z (optional) coordinates, the camera angles (optional, currently used only for radiometric calibration) and the horizontal/vertical accuracy (optional):</p></li>
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<li><p>Camera angles can be set to <code class="docutils literal notranslate"><span class="pre">0</span></code> if they are not available.</p></li>
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<li><p>The 10th column (optional) can contain extra fields, such as a label.</p></li>
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</ul>
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</div></blockquote>
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<p>File format:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o"><</span><span class="n">projection</span><span class="o">></span>
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<span class="n">image_name</span> <span class="n">geo_x</span> <span class="n">geo_y</span> <span class="p">[</span><span class="n">geo_z</span><span class="p">]</span> <span class="p">[</span><span class="n">omega</span> <span class="p">(</span><span class="n">degrees</span><span class="p">)]</span> <span class="p">[</span><span class="n">phi</span> <span class="p">(</span><span class="n">degrees</span><span class="p">)]</span> <span class="p">[</span><span class="n">kappa</span> <span class="p">(</span><span class="n">degrees</span><span class="p">)]</span> <span class="p">[</span><span class="n">horz</span> <span class="n">accuracy</span> <span class="p">(</span><span class="n">meters</span><span class="p">)]</span> <span class="p">[</span><span class="n">vert</span> <span class="n">accuracy</span> <span class="p">(</span><span class="n">meters</span><span class="p">)]</span> <span class="p">[</span><span class="n">extras</span><span class="o">...</span><span class="p">]</span>
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<span class="o">...</span>
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</pre></div>
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</div>
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<p>Example:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">EPSG</span><span class="p">:</span><span class="mi">4326</span>
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<span class="n">DJI_0028</span><span class="o">.</span><span class="n">JPG</span> <span class="o">-</span><span class="mf">91.9942096111111</span> <span class="mf">46.84252125</span> <span class="mf">198.609</span>
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<span class="n">DJI_0032</span><span class="o">.</span><span class="n">JPG</span> <span class="o">-</span><span class="mf">91.9938293055556</span> <span class="mf">46.8424584444444</span> <span class="mf">198.609</span>
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</pre></div>
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</div>
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<p>If you supply a file called <code class="docutils literal notranslate"><span class="pre">geo.txt</span></code> then ODM will automatically detect it. If it has another name you can specify using <code class="docutils literal notranslate"><span class="pre">--geo</span> <span class="pre"><path></span></code>.</p>
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<p>The <code class="docutils literal notranslate"><span class="pre">geo.txt</span></code> file must be created in the base of your project folder.</p>
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<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/geo.rst">this page</a>!</p>
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