diff options
Diffstat (limited to 'operations/transformations/xyzgridshift.html')
| -rw-r--r-- | operations/transformations/xyzgridshift.html | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/operations/transformations/xyzgridshift.html b/operations/transformations/xyzgridshift.html new file mode 100644 index 00000000..57e7f08a --- /dev/null +++ b/operations/transformations/xyzgridshift.html @@ -0,0 +1,256 @@ +<!DOCTYPE html> +<html class="writer-html5" lang="en" > +<head> + <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" /> + + <meta name="viewport" content="width=device-width, initial-scale=1.0" /> + <title>Geocentric grid shift — PROJ 9.0.0 documentation</title> + <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" /> + <link rel="stylesheet" href="../../_static/css/theme.css" type="text/css" /> + <link rel="shortcut icon" href="../../_static/favicon.png"/> + <link rel="canonical" href="https://proj.orgoperations/transformations/xyzgridshift.html"/> + <!--[if lt IE 9]> + <script src="../../_static/js/html5shiv.min.js"></script> + <![endif]--> + + <script data-url_root="../../" id="documentation_options" src="../../_static/documentation_options.js"></script> + <script src="../../_static/jquery.js"></script> + <script src="../../_static/underscore.js"></script> + <script src="../../_static/doctools.js"></script> + <script src="../../_static/js/theme.js"></script> + <link rel="author" title="About these documents" href="../../about.html" /> + <link rel="index" title="Index" href="../../genindex.html" /> + <link rel="search" title="Search" href="../../search.html" /> + <link rel="next" title="The pipeline operator" href="../pipeline.html" /> + <link rel="prev" title="Vertical grid shift" href="vgridshift.html" /> +</head> + +<body class="wy-body-for-nav"> + <div class="wy-grid-for-nav"> + <nav data-toggle="wy-nav-shift" class="wy-nav-side"> + <div class="wy-side-scroll"> + <div class="wy-side-nav-search" style="background: #353130" > + <a href="../../index.html"> + <img src="../../_static/logo.png" class="logo" alt="Logo"/> + </a> + <div class="version"> + 9.0.0 + </div> +<div role="search"> + <form id="rtd-search-form" class="wy-form" action="../../search.html" method="get"> + <input type="text" name="q" placeholder="Search docs" /> + <input type="hidden" name="check_keywords" value="yes" /> + <input type="hidden" name="area" value="default" /> + </form> +</div> + </div><div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="Navigation menu"> + <ul class="current"> +<li class="toctree-l1"><a class="reference internal" href="../../about.html">About</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../news.html">News</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../download.html">Download</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../install.html">Installation</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../usage/index.html">Using PROJ</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../apps/index.html">Applications</a></li> +<li class="toctree-l1 current"><a class="reference internal" href="../index.html">Coordinate operations</a><ul class="current"> +<li class="toctree-l2"><a class="reference internal" href="../projections/index.html">Projections</a></li> +<li class="toctree-l2"><a class="reference internal" href="../conversions/index.html">Conversions</a></li> +<li class="toctree-l2 current"><a class="reference internal" href="index.html">Transformations</a><ul class="current"> +<li class="toctree-l3"><a class="reference internal" href="affine.html">Affine transformation</a></li> +<li class="toctree-l3"><a class="reference internal" href="defmodel.html">Multi-component time-based deformation model</a></li> +<li class="toctree-l3"><a class="reference internal" href="deformation.html">Kinematic datum shifting utilizing a deformation model</a></li> +<li class="toctree-l3"><a class="reference internal" href="geogoffset.html">Geographic offsets</a></li> +<li class="toctree-l3"><a class="reference internal" href="helmert.html">Helmert transform</a></li> +<li class="toctree-l3"><a class="reference internal" href="horner.html">Horner polynomial evaluation</a></li> +<li class="toctree-l3"><a class="reference internal" href="molodensky.html">Molodensky transform</a></li> +<li class="toctree-l3"><a class="reference internal" href="molobadekas.html">Molodensky-Badekas transform</a></li> +<li class="toctree-l3"><a class="reference internal" href="hgridshift.html">Horizontal grid shift</a></li> +<li class="toctree-l3"><a class="reference internal" href="tinshift.html">Triangulated Irregular Network based transformation</a></li> +<li class="toctree-l3"><a class="reference internal" href="vgridshift.html">Vertical grid shift</a></li> +<li class="toctree-l3 current"><a class="current reference internal" href="#">Geocentric grid shift</a><ul> +<li class="toctree-l4"><a class="reference internal" href="#example">Example</a></li> +</ul> +</li> +</ul> +</li> +<li class="toctree-l2"><a class="reference internal" href="../pipeline.html">The pipeline operator</a></li> +<li class="toctree-l2"><a class="reference internal" href="../operations_computation.html">Computation of coordinate operations between two CRS</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../../resource_files.html">Resource files</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../geodesic.html">Geodesic calculations</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../development/index.html">Development</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../specifications/index.html">Specifications</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../community/index.html">Community</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../faq.html">FAQ</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../glossary.html">Glossary</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../zreferences.html">References</a></li> +</ul> + + </div> + </div> + </nav> + + <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">Transformations</a> »</li> + <li>Geocentric grid shift</li> + <li class="wy-breadcrumbs-aside"> + <a href="https://github.com/OSGeo/PROJ/edit/8.2/docs/source/operations/transformations/xyzgridshift.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="vgridshift.html" class="btn btn-neutral float-left" title="Vertical grid shift" accesskey="p"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a> + <a href="../pipeline.html" class="btn btn-neutral float-right" title="The pipeline operator" 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="geocentric-grid-shift"> +<span id="xyzgridshift"></span><h1>Geocentric grid shift<a class="headerlink" href="#geocentric-grid-shift" 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>Geocentric translation using a grid shift</p> +<table class="docutils align-default"> +<colgroup> +<col style="width: 20%" /> +<col style="width: 80%" /> +</colgroup> +<tbody> +<tr class="row-odd"><td><p><strong>Alias</strong></p></td> +<td><p>xyzgridshift</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>Cartesian coordinates</p></td> +</tr> +<tr class="row-even"><td><p><strong>Output type</strong></p></td> +<td><p>Cartesian coordinates</p></td> +</tr> +</tbody> +</table> +<p>Perform a geocentric translation by bilinear interpolation of dx, dy, dz +translation values from a grid. The grid is referenced against either the +2D geographic CRS corresponding to the input (or sometimes output) CRS.</p> +<p>This method is described (in French) in <span id="id1">[<a class="reference internal" href="../../zreferences.html#id26" title="IGN. Grille de parametres de transformation de coordonnees - GR3DF97A - notice d'utilisation. Technical Report, Service de Geodesie et Nivellement, Institut Geographique National, 1997. URL: https://geodesie.ign.fr/contenu/fichiers/documentation/algorithmes/notice/NTG_88.pdf.">NTF_88</a>]</span> +and as EPSG operation method code 9655 in <span id="id2">[<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> (§2.4.4.1.1 +France geocentric interpolation).</p> +<p>The translation in the grids are added to the input coordinates in the forward direction, +and subtracted in the reverse direction. +By default (if <code class="docutils literal notranslate"><span class="pre">grid_ref=input_crs</span></code>), in the forward direction, the input coordinates +are converted to their geographic equivalent to directly read and interpolate from +the grid. In the reverse direction, an iterative method is used to be able to find +the grid locations to read. +If <code class="docutils literal notranslate"><span class="pre">grid_ref=output_crs</span></code> is used, then the reverse strategy is applied: iterative +method in the forward direction, and direct read in the reverse direction.</p> +<section id="example"> +<h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2> +<p>NTF to RGF93 transformation using <code class="file docutils literal notranslate"><span class="pre">gr3df97a.tif</span></code> grid</p> +<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>+proj=pipeline + +step +proj=push +v_3 + +step +proj=cart +ellps=clrk80ign + +step +proj=xyzgridshift +grids=gr3df97a.tif +grid_ref=output_crs +ellps=GRS80 + +step +proj=cart +ellps=GRS80 +inv + +step +proj=pop +v_3 +</pre></div> +</div> +<section id="parameters"> +<h3>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h3> +<p>The ellipsoid parameters should be the ones consistent with <code class="docutils literal notranslate"><span class="pre">grid_ref</span></code>. +They are used to perform a geocentric to geographic conversion to find the +translation parameters.</p> +<section id="required"> +<h4>Required<a class="headerlink" href="#required" title="Permalink to this headline">¶</a></h4> +<dl class="std option"> +<dt class="sig sig-object std" id="cmdoption-arg-ellps"> +<span class="sig-name descname"><span class="pre">+ellps</span></span><span class="sig-prename descclassname"><span class="pre">=<value></span></span><a class="headerlink" href="#cmdoption-arg-ellps" title="Permalink to this definition">¶</a></dt> +<dd><p>The name of a built-in ellipsoid definition.</p> +<p>See <a class="reference internal" href="../../usage/ellipsoids.html#ellipsoids"><span class="std std-ref">Ellipsoids</span></a> for more information, or execute +<a class="reference internal" href="../../apps/proj.html#cmdoption-proj-le"><code class="xref std std-option docutils literal notranslate"><span class="pre">proj</span> <span class="pre">-le</span></code></a> for a list of built-in ellipsoid names.</p> +<p><em>Defaults to “GRS80”.</em></p> +</dd></dl> + +<dl class="std option"> +<dt class="sig sig-object std" id="cmdoption-arg-grids"> +<span class="sig-name descname"><span class="pre">+grids</span></span><span class="sig-prename descclassname"><span class="pre">=<list></span></span><a class="headerlink" href="#cmdoption-arg-grids" title="Permalink to this definition">¶</a></dt> +<dd><p>Comma-separated list of grids to load. If a grid is prefixed by an <code class="docutils literal notranslate"><span class="pre">@</span></code> the +grid is considered optional and PROJ will the not complain if the grid is +not available.</p> +<p>Grids are expected to be in GeoTIFF format. If no metadata is provided, +the first, second and third samples are assumed to be the geocentric +translation along X, Y and Z axis respectively, in metres.</p> +</dd></dl> + +</section> +<section id="optional"> +<h4>Optional<a class="headerlink" href="#optional" title="Permalink to this headline">¶</a></h4> +<dl class="std option"> +<dt class="sig sig-object std" id="cmdoption-arg-grid_ref"> +<span id="cmdoption-arg-grid-ref"></span><span class="sig-name descname"><span class="pre">+grid_ref</span></span><span class="sig-prename descclassname"><span class="pre">=input_crs/output_crs</span></span><a class="headerlink" href="#cmdoption-arg-grid_ref" title="Permalink to this definition">¶</a></dt> +<dd><p>Specify in which CRS the grid is referenced to. The default value is +input_crs. That is the grid is referenced in the geographic CRS corresponding +to the input geocentric CRS.</p> +<p>If output_crs is specified, the grid is referenced in the geographic CRS corresponding +to the output geocentric CRS. This is for example the case for the French +<code class="file docutils literal notranslate"><span class="pre">gr3df97a.tif</span></code> grid converting from NTF to RGF93, but referenced against RGF93. +Thus in the forward direction (NTF->RGF93), an iterative method is used to find +the appropriate shift.</p> +</dd></dl> + +<dl class="std option"> +<dt class="sig sig-object std" id="cmdoption-arg-multiplier"> +<span class="sig-name descname"><span class="pre">+multiplier</span></span><span class="sig-prename descclassname"><span class="pre">=<value></span></span><a class="headerlink" href="#cmdoption-arg-multiplier" title="Permalink to this definition">¶</a></dt> +<dd><p>Specify the multiplier to apply to the grid values. Defaults to 1.0</p> +</dd></dl> + +</section> +</section> +</section> +</section> + + + </div> + </div> + <footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer"> + <a href="vgridshift.html" class="btn btn-neutral float-left" title="Vertical grid shift" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a> + <a href="../pipeline.html" class="btn btn-neutral float-right" title="The pipeline operator" 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>
\ No newline at end of file |