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time-based deformation model</li> + <li class="wy-breadcrumbs-aside"> + <a href="https://github.com/OSGeo/PROJ/edit/8.2/docs/source/operations/transformations/defmodel.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="affine.html" class="btn btn-neutral float-left" title="Affine transformation" accesskey="p"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a> + <a href="deformation.html" class="btn btn-neutral float-right" title="Kinematic datum shifting utilizing a deformation model" 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="multi-component-time-based-deformation-model"> +<span id="defmodel"></span><h1>Multi-component time-based deformation model<a class="headerlink" href="#multi-component-time-based-deformation-model" title="Permalink to this headline">¶</a></h1> +<div class="versionadded"> +<p><span class="versionmodified added">New in version 7.1.0.</span></p> +</div> +<table class="docutils align-default"> +<colgroup> +<col style="width: 24%" /> +<col style="width: 76%" /> +</colgroup> +<tbody> +<tr class="row-odd"><td><p><strong>Alias</strong></p></td> +<td><p>defmodel</p></td> +</tr> +<tr class="row-even"><td><p><strong>Input type</strong></p></td> +<td><p>Geodetic or projected coordinates (horizontal), meters (vertical), +decimalyear (temporal)</p></td> +</tr> +<tr class="row-odd"><td><p><strong>Output type</strong></p></td> +<td><p>Geodetic or projected coordinates (horizontal), meters (vertical), +decimalyear (temporal)</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>Available forms</strong></p></td> +<td><p>Forward and inverse</p></td> +</tr> +</tbody> +</table> +<p>The defmodel transformation can be used to represent most deformation models +currently in use, in particular for areas subject to complex deformation, including +large scale secular crustal deformation near plate boundaries and vertical deformation +due to Glacial Isostatic Adjustment (GIA). These can often be represented by a constant +velocity model. Additionally, many areas suffer episodic deformation events such as +earthquakes and aseismic slow slip event.</p> +<p>The transformation relies on a “master” JSON file, describing general metadata on +the deformation model, its spatial and temporal extent, and listing spatial +components whose values are stored in <a class="reference internal" href="../../specifications/geodetictiffgrids.html#geodetictiffgrids"><span class="std std-ref">Geodetic TIFF grids (GTG)</span></a>. +The valuation of each component is modulated by a time function (constant, step, +reverse step, velocity, piecewise, exponential).</p> +<p>All details on the content of this JSON file are given in the <a class="reference external" href="https://github.com/linz/deformation-model-format/blob/master/doc/JsonGeotiffDeformationModelFormat_20200501.pdf">Proposal for encoding +of a Deformation Model</a></p> +<p>If input coordinates are given in the geographic domain (resp. projected domain), +the output will also be in the geographic domain (resp. projected domain). +The domain should be the corresponding to the source_crs metadata of the model.</p> +<p>This transformation is a generalization of the <a class="reference internal" href="deformation.html#deformation"><span class="std std-ref">Kinematic datum shifting utilizing a deformation model</span></a> transformation.</p> +<section id="parameters"> +<h2>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2> +<section id="required"> +<h3>Required<a class="headerlink" href="#required" title="Permalink to this headline">¶</a></h3> +<dl class="std option"> +<dt class="sig sig-object std" id="cmdoption-arg-model"> +<span class="sig-name descname"><span class="pre">+model</span></span><span class="sig-prename descclassname"><span class="pre">=<filename></span></span><a class="headerlink" href="#cmdoption-arg-model" title="Permalink to this definition">¶</a></dt> +<dd><p>Filename to the JSON master file for the deformation model.</p> +</dd></dl> + +</section> +</section> +<section id="example"> +<h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2> +<p>Transforming a point with the LINZ NZGD2000 deformation model:</p> +<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>echo 166.7133850980 -44.5105886020 293.3700 2007.689 | cct +proj=defmodel +model=nzgd2000-20180701.json +</pre></div> +</div> +</section> +</section> + + + </div> + </div> + <footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer"> + <a href="affine.html" class="btn btn-neutral float-left" title="Affine transformation" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a> + <a href="deformation.html" class="btn btn-neutral float-right" title="Kinematic datum shifting utilizing a deformation model" 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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