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+  <section id="geographic-offsets">
+<span id="geogoffset"></span><h1>Geographic offsets<a class="headerlink" href="#geographic-offsets" title="Permalink to this headline">¶</a></h1>
+<div class="versionadded">
+<p><span class="versionmodified added">New in version 6.0.0.</span></p>
+</div>
+<p>The Geographic offsets transformation adds an offset to the geographic longitude,
+latitude coordinates, and an offset to the ellipsoidal height.</p>
+<table class="docutils align-default">
+<colgroup>
+<col style="width: 27%" />
+<col style="width: 73%" />
+</colgroup>
+<tbody>
+<tr class="row-odd"><td><p><strong>Alias</strong></p></td>
+<td><p>geogoffset</p></td>
+</tr>
+<tr class="row-even"><td><p><strong>Domain</strong></p></td>
+<td><p>3D</p></td>
+</tr>
+<tr class="row-odd"><td><p><strong>Input type</strong></p></td>
+<td><p>Geodetic coordinates (horizontal), meters (vertical)</p></td>
+</tr>
+<tr class="row-even"><td><p><strong>output type</strong></p></td>
+<td><p>Geodetic coordinates (horizontal), meters (vertical)</p></td>
+</tr>
+</tbody>
+</table>
+<p>This method is normally only used when low accuracy is tolerated. It is documented
+as coordinate operation method code 9619 (for geographic 2D) and 9660 (for
+geographic 3D) in the EPSG dataset (<span id="id1">[<a class="reference internal" href="../../zreferences.html#id17" title="IOGP. Geomatics guidance note 7, part 2: coordinate conversions &amp; transformations including formulas. IOGP Publication 373-7-2, International Association For Oil And Gas Producers, 2018. URL: https://www.iogp.org/bookstore/product/coordinate-conversions-and-transformation-including-formulas/.">IOGP2018</a>]</span>)</p>
+<p>It can also be used to implement the method Geographic2D with Height Offsets
+(code 9618) by noting that the input vertical component is a gravity-related
+height and the output vertical component is the ellipsoid height (dh being
+the geoid undulation).</p>
+<p>It can also be used to implement the method Vertical offset (code 9616)</p>
+<p>The reverse transformation simply consists in subtracting the offsets.</p>
+<p>This method is a conveniency wrapper for the more general <a class="reference internal" href="affine.html#affine"><span class="std std-ref">Affine transformation</span></a>.</p>
+<section id="examples">
+<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
+<p>Geographic offset from the old Greek geographic 2D CRS to the newer GGRS87 CRS:</p>
+<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>proj=geogoffset dlon=0.28 dlat=-5.86
+</pre></div>
+</div>
+<p>Conversion from Tokyo + JSLD69 height to WGS 84:</p>
+<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>proj=geogoffset dlon=-13.97 dlat=7.94 dh=26.9
+</pre></div>
+</div>
+<p>Conversion from Baltic 1977 height to Black Sea height:</p>
+<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>proj=geogoffset dh=0.4
+</pre></div>
+</div>
+</section>
+<section id="parameters">
+<h2>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2>
+<section id="optional">
+<h3>Optional<a class="headerlink" href="#optional" title="Permalink to this headline">¶</a></h3>
+<dl class="std option">
+<dt class="sig sig-object std" id="cmdoption-arg-dlon">
+<span class="sig-name descname"><span class="pre">+dlon</span></span><span class="sig-prename descclassname"><span class="pre">=&lt;value&gt;</span></span><a class="headerlink" href="#cmdoption-arg-dlon" title="Permalink to this definition">¶</a></dt>
+<dd><p>Offset in longitude, expressed in arc-second, to add.</p>
+</dd></dl>
+
+<dl class="std option">
+<dt class="sig sig-object std" id="cmdoption-arg-dlat">
+<span class="sig-name descname"><span class="pre">+dlat</span></span><span class="sig-prename descclassname"><span class="pre">=&lt;value&gt;</span></span><a class="headerlink" href="#cmdoption-arg-dlat" title="Permalink to this definition">¶</a></dt>
+<dd><p>Offset in latitude, expressed in arc-second, to add.</p>
+</dd></dl>
+
+<dl class="std option">
+<dt class="sig sig-object std" id="cmdoption-arg-dh">
+<span class="sig-name descname"><span class="pre">+dh</span></span><span class="sig-prename descclassname"><span class="pre">=&lt;value&gt;</span></span><a class="headerlink" href="#cmdoption-arg-dh" title="Permalink to this definition">¶</a></dt>
+<dd><p>Offset in height, expressed in meter, to add.</p>
+</dd></dl>
+
+</section>
+</section>
+</section>
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author	PROJ deploybot <proj.bot@proj.bot>	2022-03-22 20:00:06 +0000
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