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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 & 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">=<value></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">=<value></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">=<value></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>
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