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| author | PROJ deploybot <proj.bot@proj.bot> | 2022-03-22 20:00:06 +0000 |
|---|---|---|
| committer | PROJ deploybot <proj.bot@proj.bot> | 2022-03-22 20:00:06 +0000 |
| commit | a3f43744feec86272fe532124679d3a013ef9a8c (patch) | |
| tree | 27e4198db6011e3097eb7bcfe7197684aba7583a /operations/conversions/set.html | |
| download | PROJ-gh-pages.tar.gz PROJ-gh-pages.zip | |
update with results of commit https://github.com/OSGeo/PROJ/commit/53c07a8bd211b7aee4bc07a9c6726005504b7181gh-pages
Diffstat (limited to 'operations/conversions/set.html')
| -rw-r--r-- | operations/conversions/set.html | 238 |
1 files changed, 238 insertions, 0 deletions
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+ + <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"><nav class="wy-nav-top" aria-label="Mobile navigation menu" style="background: #353130" > + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../../index.html">PROJ</a> + </nav> + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="Page navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../../index.html" class="icon icon-home"></a> »</li> + <li><a href="../index.html">Coordinate operations</a> »</li> + <li><a href="index.html">Conversions</a> »</li> + <li>Set coordinate value</li> + <li class="wy-breadcrumbs-aside"> + <a href="https://github.com/OSGeo/PROJ/edit/8.2/docs/source/operations/conversions/set.rst" class="fa fa-github"> Edit on GitHub</a> + </li> + </ul><div class="rst-breadcrumbs-buttons" role="navigation" aria-label="Sequential page navigation"> + <a href="push.html" class="btn btn-neutral float-left" title="Push coordinate value to pipeline stack" accesskey="p"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a> + <a href="topocentric.html" class="btn btn-neutral float-right" title="Geocentric to topocentric conversion" accesskey="n">Next <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a> + </div> + <hr/> +</div> + <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article"> + <div itemprop="articleBody"> + + <section id="set-coordinate-value"> +<span id="set"></span><h1>Set coordinate value<a class="headerlink" href="#set-coordinate-value" title="Permalink to this headline">¶</a></h1> +<div class="versionadded"> +<p><span class="versionmodified added">New in version 7.0.0.</span></p> +</div> +<p>Set component(s) of a coordinate to a fixed value.</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>set</p></td> +</tr> +<tr class="row-even"><td><p><strong>Domain</strong></p></td> +<td><p>4D</p></td> +</tr> +<tr class="row-odd"><td><p><strong>Input type</strong></p></td> +<td><p>Any</p></td> +</tr> +<tr class="row-even"><td><p><strong>Output type</strong></p></td> +<td><p>Any</p></td> +</tr> +</tbody> +</table> +<p>This operations allows for components of coordinates to be set to a fixed value. +This may be useful in <a class="reference internal" href="../pipeline.html#pipeline"><span class="std std-ref">pipeline</span></a> when a step requires some +component, typically an elevation or a date, to be set to a fixed value.</p> +<section id="example"> +<h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2> +<p>In the ETRS89 to Dutch RD with NAP height transformation, the used ellipsoidal +height for the Helmert transformation is not the NAP height, but the height is +set to 0 m. This is an unconventional trick to get the same results as when the +effect of the Helmert transformation is included in the horizontal NTv2 grid. +For the forward transformation from ETRS89 to RD with NAP height, we need to set +the ellipsoidal ETRS89 height for the Helmert transformation to the equivalent +of 0 m NAP. This is 43 m for the centre of the Netherlands and this value can +be used as an approximation elsewhere (the effect of this approximation is +below 1 mm for the horizontal coordinates, in an area up to hundreds of km +outside the Netherlands).</p> +<p>The <code class="docutils literal notranslate"><span class="pre">+proj=set</span> <span class="pre">+v_3=0</span></code> close to the end of the pipeline is to make it usable in +the reverse direction.</p> +<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ cct -t 0 -d 4 +proj=pipeline \ + +step +proj=unitconvert +xy_in=deg +xy_out=rad \ + +step +proj=axisswap +order=2,1 \ + +step +proj=vgridshift +grids=nlgeo2018.gtx \ + +step +proj=push +v_3 \ + +step +proj=set +v_3=43 \ + +step +proj=cart +ellps=GRS80 \ + +step +proj=helmert +x=-565.7346 +y=-50.4058 +z=-465.2895 +rx=-0.395023 +ry=0.330776 +rz=-1.876073 +s=-4.07242 +convention=coordinate_frame +exact \ + +step +proj=cart +inv +ellps=bessel \ + +step +proj=hgridshift +inv +grids=rdcorr2018.gsb,null \ + +step +proj=sterea +lat_0=52.156160556 +lon_0=5.387638889 +k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel \ + +step +proj=set +v_3=0 \ + +step +proj=pop +v_3 +</pre></div> +</div> +</section> +<section id="parameters"> +<h2>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2> +<dl class="std option"> +<dt class="sig sig-object std" id="cmdoption-arg-v_1"> +<span id="cmdoption-arg-v-1"></span><span class="sig-name descname"><span class="pre">+v_1</span></span><span class="sig-prename descclassname"><span class="pre">=value</span></span><a class="headerlink" href="#cmdoption-arg-v_1" title="Permalink to this definition">¶</a></dt> +<dd><p>Set the first coordinate component to the specified value</p> +</dd></dl> + +<dl class="std option"> +<dt class="sig sig-object std" id="cmdoption-arg-v_2"> +<span id="cmdoption-arg-v-2"></span><span class="sig-name descname"><span class="pre">+v_2</span></span><span class="sig-prename descclassname"><span class="pre">=value</span></span><a class="headerlink" href="#cmdoption-arg-v_2" title="Permalink to this definition">¶</a></dt> +<dd><p>Set the second coordinate component to the specified value</p> +</dd></dl> + +<dl class="std option"> +<dt class="sig sig-object std" id="cmdoption-arg-v_3"> +<span id="cmdoption-arg-v-3"></span><span class="sig-name descname"><span class="pre">+v_3</span></span><span class="sig-prename descclassname"><span class="pre">=value</span></span><a class="headerlink" href="#cmdoption-arg-v_3" title="Permalink to this definition">¶</a></dt> +<dd><p>Set the third coordinate component to the specified value</p> +</dd></dl> + +<dl class="std option"> +<dt class="sig sig-object std" id="cmdoption-arg-v_4"> +<span id="cmdoption-arg-v-4"></span><span class="sig-name descname"><span class="pre">+v_4</span></span><span class="sig-prename descclassname"><span class="pre">=value</span></span><a class="headerlink" href="#cmdoption-arg-v_4" title="Permalink to this definition">¶</a></dt> +<dd><p>Set the fourth coordinate component to the specified value</p> +</dd></dl> + +</section> +</section> + + + </div> + </div> + <footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer"> + <a href="push.html" class="btn btn-neutral float-left" title="Push coordinate value to pipeline stack" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a> + <a href="topocentric.html" class="btn btn-neutral float-right" title="Geocentric to topocentric conversion" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a> + </div> + + <hr/> + + <div role="contentinfo"> + <p>© Copyright 1983-2022. + <span class="lastupdated">Last updated on 22 Mar 2022. + </span></p> + </div> + + Built with <a href="https://www.sphinx-doc.org/">Sphinx</a> using a + <a href="https://github.com/readthedocs/sphinx_rtd_theme">theme</a> + provided by <a href="https://readthedocs.org">Read the Docs</a>. + + +</footer> + </div> + </div> + </section> + </div> + <script> + jQuery(function () { + SphinxRtdTheme.Navigation.enable(true); + }); + </script> + +</body> +</html>
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