diff options
Diffstat (limited to 'development/migration.html')
| -rw-r--r-- | development/migration.html | 553 |
1 files changed, 553 insertions, 0 deletions
diff --git a/development/migration.html b/development/migration.html new file mode 100644 index 00000000..bbe071b7 --- /dev/null +++ b/development/migration.html @@ -0,0 +1,553 @@ +<!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>Version 4 to 6 API Migration — 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.orgdevelopment/migration.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="Specifications" href="../specifications/index.html" /> + <link rel="prev" title="Language bindings" href="bindings.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"><a class="reference internal" href="../operations/index.html">Coordinate operations</a></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 current"><a class="reference internal" href="index.html">Development</a><ul class="current"> +<li class="toctree-l2"><a class="reference internal" href="quickstart.html">Quick start</a></li> +<li class="toctree-l2"><a class="reference internal" href="transformations.html">Transformations</a></li> +<li class="toctree-l2"><a class="reference internal" href="errorhandling.html">Error handling</a></li> +<li class="toctree-l2"><a class="reference internal" href="reference/index.html">Reference</a></li> +<li class="toctree-l2"><a class="reference internal" href="cmake.html">Using PROJ in CMake projects</a></li> +<li class="toctree-l2"><a class="reference internal" href="bindings.html">Language bindings</a></li> +<li class="toctree-l2 current"><a class="current reference internal" href="#">Version 4 to 6 API Migration</a><ul> +<li class="toctree-l3"><a class="reference internal" href="#code-example">Code example</a></li> +<li class="toctree-l3"><a class="reference internal" href="#function-mapping-from-old-to-new-api">Function mapping from old to new API</a></li> +<li class="toctree-l3"><a class="reference internal" href="#backward-incompatibilities">Backward incompatibilities</a></li> +<li class="toctree-l3"><a class="reference internal" href="#feedback-from-downstream-projects-on-the-proj-6-migration">Feedback from downstream projects on the PROJ 6 migration</a></li> +</ul> +</li> +<li class="toctree-l2"><a class="reference internal" href="#version-4-to-5-api-migration">Version 4 to 5 API Migration</a><ul> +<li class="toctree-l3"><a class="reference internal" href="#background">Background</a></li> +<li class="toctree-l3"><a class="reference internal" href="#id1">Code example</a></li> +<li class="toctree-l3"><a class="reference internal" href="#id2">Function mapping from old to new API</a></li> +</ul> +</li> +</ul> +</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">Development</a> »</li> + <li>Version 4 to 6 API Migration</li> + <li class="wy-breadcrumbs-aside"> + <a href="https://github.com/OSGeo/PROJ/edit/8.2/docs/source/development/migration.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="bindings.html" class="btn btn-neutral float-left" title="Language bindings" accesskey="p"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a> + <a href="../specifications/index.html" class="btn btn-neutral float-right" title="Specifications" 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="version-4-to-6-api-migration"> +<span id="api-migration"></span><h1>Version 4 to 6 API Migration<a class="headerlink" href="#version-4-to-6-api-migration" title="Permalink to this headline">¶</a></h1> +<p>This is a transition guide for developers wanting to migrate their code to use +PROJ version 6.</p> +<section id="code-example"> +<h2>Code example<a class="headerlink" href="#code-example" title="Permalink to this headline">¶</a></h2> +<p>The difference between the old and new API is shown here with a few examples. Below +we implement the same program with the two different API’s. The program reads +input longitude and latitude from the command line and convert them to +projected coordinates with the Mercator projection.</p> +<p>We start by writing the program for PROJ 4:</p> +<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><proj_api.h></span><span class="cp"></span> + +<span class="n">main</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">**</span><span class="n">argv</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"></span> +<span class="w"> </span><span class="n">projPJ</span><span class="w"> </span><span class="n">pj_merc</span><span class="p">,</span><span class="w"> </span><span class="n">pj_longlat</span><span class="p">;</span><span class="w"></span> +<span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="p">;</span><span class="w"></span> +<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">p</span><span class="p">;</span><span class="w"></span> + +<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="o">!</span><span class="p">(</span><span class="n">pj_longlat</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">pj_init_plus</span><span class="p">(</span><span class="s">"+proj=longlat +ellps=clrk66"</span><span class="p">))</span><span class="w"> </span><span class="p">)</span><span class="w"></span> +<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span><span class="w"></span> +<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="o">!</span><span class="p">(</span><span class="n">pj_merc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">pj_init_plus</span><span class="p">(</span><span class="s">"+proj=merc +datum=clrk66 +lat_ts=33"</span><span class="p">))</span><span class="w"> </span><span class="p">)</span><span class="w"></span> +<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span><span class="w"></span> + +<span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="n">scanf</span><span class="p">(</span><span class="s">"%lf %lf"</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">y</span><span class="p">)</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">2</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"></span> +<span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="o">*=</span><span class="w"> </span><span class="n">DEG_TO_RAD</span><span class="p">;</span><span class="w"> </span><span class="cm">/* longitude */</span><span class="w"></span> +<span class="w"> </span><span class="n">y</span><span class="w"> </span><span class="o">*=</span><span class="w"> </span><span class="n">DEG_TO_RAD</span><span class="p">;</span><span class="w"> </span><span class="cm">/* latitude */</span><span class="w"></span> +<span class="w"> </span><span class="n">p</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">pj_transform</span><span class="p">(</span><span class="n">pj_longlat</span><span class="p">,</span><span class="w"> </span><span class="n">pj_merc</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">y</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="n">printf</span><span class="p">(</span><span class="s">"%.2f</span><span class="se">\t</span><span class="s">%.2f</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="p">}</span><span class="w"></span> + +<span class="w"> </span><span class="n">pj_free</span><span class="p">(</span><span class="n">pj_longlat</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="n">pj_free</span><span class="p">(</span><span class="n">pj_merc</span><span class="p">);</span><span class="w"></span> + +<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"></span> +<span class="p">}</span><span class="w"></span> +</pre></div> +</div> +<p>The same program implemented using PROJ 6:</p> +<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><proj.h></span><span class="cp"></span> + +<span class="n">main</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">**</span><span class="n">argv</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"></span> +<span class="w"> </span><span class="n">PJ</span><span class="w"> </span><span class="o">*</span><span class="n">P</span><span class="p">;</span><span class="w"></span> +<span class="w"> </span><span class="n">PJ_COORD</span><span class="w"> </span><span class="n">c</span><span class="p">,</span><span class="w"> </span><span class="n">c_out</span><span class="p">;</span><span class="w"></span> + +<span class="w"> </span><span class="cm">/* NOTE: the use of PROJ strings to describe CRS is strongly discouraged */</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* in PROJ 6, as PROJ strings are a poor way of describing a CRS, and */</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* more precise its geodetic datum. */</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* Use of codes provided by authorities (such as "EPSG:4326", etc...) */</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* or WKT strings will bring the full power of the "transformation */</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* engine" used by PROJ to determine the best transformation(s) between */</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* two CRS. */</span><span class="w"></span> +<span class="w"> </span><span class="n">P</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">proj_create_crs_to_crs</span><span class="p">(</span><span class="n">PJ_DEFAULT_CTX</span><span class="p">,</span><span class="w"></span> +<span class="w"> </span><span class="s">"+proj=longlat +ellps=clrs66"</span><span class="p">,</span><span class="w"></span> +<span class="w"> </span><span class="s">"+proj=merc +ellps=clrk66 +lat_ts=33"</span><span class="p">,</span><span class="w"></span> +<span class="w"> </span><span class="nb">NULL</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">P</span><span class="o">==</span><span class="mi">0</span><span class="p">)</span><span class="w"></span> +<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span><span class="w"></span> + +<span class="w"> </span><span class="p">{</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* For that particular use case, this is not needed. */</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* proj_normalize_for_visualization() ensures that the coordinate */</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* order expected and returned by proj_trans() will be longitude, */</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* latitude for geographic CRS, and easting, northing for projected */</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* CRS. If instead of using PROJ strings as above, "EPSG:XXXX" codes */</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* had been used, this might had been necessary. */</span><span class="w"></span> +<span class="w"> </span><span class="n">PJ</span><span class="o">*</span><span class="w"> </span><span class="n">P_for_GIS</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">proj_normalize_for_visualization</span><span class="p">(</span><span class="n">PJ_DEFAULT_CTX</span><span class="p">,</span><span class="w"> </span><span class="n">P</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">P_for_GIS</span><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"></span> +<span class="w"> </span><span class="n">proj_destroy</span><span class="p">(</span><span class="n">P</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span><span class="w"></span> +<span class="w"> </span><span class="p">}</span><span class="w"></span> +<span class="w"> </span><span class="n">proj_destroy</span><span class="p">(</span><span class="n">P</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="n">P</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">P_for_GIS</span><span class="p">;</span><span class="w"></span> +<span class="w"> </span><span class="p">}</span><span class="w"></span> + +<span class="w"> </span><span class="cm">/* For reliable geographic <--> geocentric conversions, z shall not */</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* be some random value. Also t shall be initialized to HUGE_VAL to */</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* allow for proper selection of time-dependent operations if one of */</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* the CRS is dynamic. */</span><span class="w"></span> +<span class="w"> </span><span class="n">c</span><span class="p">.</span><span class="n">lpzt</span><span class="p">.</span><span class="n">z</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0.0</span><span class="p">;</span><span class="w"></span> +<span class="w"> </span><span class="n">c</span><span class="p">.</span><span class="n">lpzt</span><span class="p">.</span><span class="n">t</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">HUGE_VAL</span><span class="p">;</span><span class="w"></span> + +<span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="n">scanf</span><span class="p">(</span><span class="s">"%lf %lf"</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">c</span><span class="p">.</span><span class="n">lpzt</span><span class="p">.</span><span class="n">lam</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">c</span><span class="p">.</span><span class="n">lpzt</span><span class="p">.</span><span class="n">phi</span><span class="p">)</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">2</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"></span> +<span class="w"> </span><span class="cm">/* No need to convert to radian */</span><span class="w"></span> +<span class="w"> </span><span class="n">c_out</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">proj_trans</span><span class="p">(</span><span class="n">P</span><span class="p">,</span><span class="w"> </span><span class="n">PJ_FWD</span><span class="p">,</span><span class="w"> </span><span class="n">c</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="n">printf</span><span class="p">(</span><span class="s">"%.2f</span><span class="se">\t</span><span class="s">%.2f</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="n">c_out</span><span class="p">.</span><span class="n">xy</span><span class="p">.</span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">c_out</span><span class="p">.</span><span class="n">xy</span><span class="p">.</span><span class="n">y</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="p">}</span><span class="w"></span> + +<span class="w"> </span><span class="n">proj_destroy</span><span class="p">(</span><span class="n">P</span><span class="p">);</span><span class="w"></span> + +<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"></span> +<span class="p">}</span><span class="w"></span> +</pre></div> +</div> +</section> +<section id="function-mapping-from-old-to-new-api"> +<h2>Function mapping from old to new API<a class="headerlink" href="#function-mapping-from-old-to-new-api" title="Permalink to this headline">¶</a></h2> +<table class="docutils align-default"> +<colgroup> +<col style="width: 44%" /> +<col style="width: 56%" /> +</colgroup> +<thead> +<tr class="row-odd"><th class="head"><p>Old API functions</p></th> +<th class="head"><p>New API functions</p></th> +</tr> +</thead> +<tbody> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_fwd</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_trans" title="proj_trans"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_trans()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_inv</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_trans" title="proj_trans"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_trans()</span></code></a></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_fwd3</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_trans" title="proj_trans"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_trans()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_inv3</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_trans" title="proj_trans"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_trans()</span></code></a></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_transform</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_create_crs_to_crs" title="proj_create_crs_to_crs"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_create_crs_to_crs()</span></code></a> +or <a class="reference internal" href="reference/functions.html#c.proj_create_crs_to_crs_from_pj" title="proj_create_crs_to_crs_from_pj"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_create_crs_to_crs_from_pj()</span></code></a> + +(<a class="reference internal" href="reference/functions.html#c.proj_normalize_for_visualization" title="proj_normalize_for_visualization"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_normalize_for_visualization()</span></code></a> +) +<a class="reference internal" href="reference/functions.html#c.proj_trans" title="proj_trans"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_trans()</span></code></a>, +<a class="reference internal" href="reference/functions.html#c.proj_trans_array" title="proj_trans_array"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_trans_array()</span></code></a> or +<a class="reference internal" href="reference/functions.html#c.proj_trans_generic" title="proj_trans_generic"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_trans_generic()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_init</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_create" title="proj_create"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_create()</span></code></a> / +<a class="reference internal" href="reference/functions.html#c.proj_create_crs_to_crs" title="proj_create_crs_to_crs"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_create_crs_to_crs()</span></code></a></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_init</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_create" title="proj_create"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_create()</span></code></a> / +<a class="reference internal" href="reference/functions.html#c.proj_create_crs_to_crs" title="proj_create_crs_to_crs"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_create_crs_to_crs()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_free</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_destroy" title="proj_destroy"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_destroy()</span></code></a></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_is_latlong</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_get_type" title="proj_get_type"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_get_type()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_is_geocent</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_get_type" title="proj_get_type"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_get_type()</span></code></a></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_get_def</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_pj_info" title="proj_pj_info"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_pj_info()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_latlong_from_proj</span></code></p></td> +<td><p><em>No direct equivalent</em>, but can be accomplished +by chaining <a class="reference internal" href="reference/functions.html#c.proj_create" title="proj_create"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_create()</span></code></a>, +<a class="reference internal" href="reference/functions.html#c.proj_crs_get_horizontal_datum" title="proj_crs_get_horizontal_datum"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_crs_get_horizontal_datum()</span></code></a> and +<code class="xref c c-func docutils literal notranslate"><span class="pre">proj_create_geographic_crs_from_datum()</span></code></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_set_finder</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_context_set_file_finder" title="proj_context_set_file_finder"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_context_set_file_finder()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_set_searchpath</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_context_set_search_paths" title="proj_context_set_search_paths"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_context_set_search_paths()</span></code></a></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_deallocate_grids</span></code></p></td> +<td><p><em>No equivalent</em></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_strerrno</span></code></p></td> +<td><p><em>No equivalent</em></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_get_errno_ref</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_errno" title="proj_errno"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_errno()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_get_release</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_info" title="proj_info"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_info()</span></code></a></p></td> +</tr> +</tbody> +</table> +</section> +<section id="backward-incompatibilities"> +<h2>Backward incompatibilities<a class="headerlink" href="#backward-incompatibilities" title="Permalink to this headline">¶</a></h2> +<p>Access to the <code class="file docutils literal notranslate"><span class="pre">proj_api.h</span></code> is still possible but requires to define the +<code class="docutils literal notranslate"><span class="pre">ACCEPT_USE_OF_DEPRECATED_PROJ_API_H</span></code> macro.</p> +<p>The emulation of the now deprecated <code class="docutils literal notranslate"><span class="pre">+init=epsg:XXXX</span></code> syntax in PROJ 6 is not +fully compatible with previous versions.</p> +<p>In particular, when used with the <code class="docutils literal notranslate"><span class="pre">pj_transform()</span></code> function, no datum shift term +(<code class="docutils literal notranslate"><span class="pre">towgs84</span></code>, <code class="docutils literal notranslate"><span class="pre">nadgrids</span></code>, <code class="docutils literal notranslate"><span class="pre">geoidgrids</span></code>) will be added during the expansion of the +<code class="docutils literal notranslate"><span class="pre">+init=epsg:XXXX</span></code> string to <code class="docutils literal notranslate"><span class="pre">+proj=YYYY</span> <span class="pre">....</span></code>. If you still uses <code class="docutils literal notranslate"><span class="pre">pj_transform()</span></code> +and want datum shift to be applied, then you need to provide a fully expanded +string with appropriate <code class="docutils literal notranslate"><span class="pre">towgs84</span></code>, <code class="docutils literal notranslate"><span class="pre">nadgrids</span></code> or <code class="docutils literal notranslate"><span class="pre">geoidgrids</span></code> terms to <code class="docutils literal notranslate"><span class="pre">pj_init()</span></code>.</p> +<p>To use the <code class="docutils literal notranslate"><span class="pre">+init=epsg:XXXX</span></code> syntax with <a class="reference internal" href="reference/functions.html#c.proj_create" title="proj_create"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_create()</span></code></a> and then +<a class="reference internal" href="reference/functions.html#c.proj_create_crs_to_crs" title="proj_create_crs_to_crs"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_create_crs_to_crs()</span></code></a>, <code class="docutils literal notranslate"><span class="pre">proj_context_use_proj4_init_rules(ctx,</span> <span class="pre">TRUE)</span></code> +or the <code class="docutils literal notranslate"><span class="pre">PROJ_USE_PROJ4_INIT_RULES=YES</span></code> environment variable must have been +previously set. In that context, datum shift will be researched. However they +might be different than with PROJ 4 or PROJ 5, since a “late-binding” approach +will be used (that is trying to find as much as possible the most direct +transformation between the source and target datum), whereas PROJ 4 or PROJ 5 +used an “early-binding” approach consisting in always going to EPSG:4326 / WGS 84.</p> +</section> +<section id="feedback-from-downstream-projects-on-the-proj-6-migration"> +<h2>Feedback from downstream projects on the PROJ 6 migration<a class="headerlink" href="#feedback-from-downstream-projects-on-the-proj-6-migration" title="Permalink to this headline">¶</a></h2> +<ul class="simple"> +<li><p><a class="reference external" href="https://www.gaia-gis.it/fossil/libspatialite/wiki?name=PROJ.6">PROJ 6 adoption by Spatialite</a></p></li> +<li><p><a class="reference external" href="https://www.icsm.gov.au/sites/default/files/North%20Road%20Handling%20GDA2020%20within%20Geospatial%20Software%20Development.pdf">On GDA2020, PROJ 6 and QGIS: Lessons learnt and recommendations for handling GDA2020 within geospatial software development</a></p></li> +</ul> +</section> +</section> +<section id="version-4-to-5-api-migration"> +<h1>Version 4 to 5 API Migration<a class="headerlink" href="#version-4-to-5-api-migration" title="Permalink to this headline">¶</a></h1> +<p>This is a transition guide for developers wanting to migrate their code to use +PROJ version 5.</p> +<section id="background"> +<h2>Background<a class="headerlink" href="#background" title="Permalink to this headline">¶</a></h2> +<p>Before we go on, a bit of background is needed. The new API takes a different +view of the world than the old because it is needed in order to obtain high +accuracy transformations. The old API is constructed in such a way that any transformation +between two coordinate reference systems <em>must</em> pass through the ill-defined +WGS84 reference frame, using it as a hub. The new API does away with this limitation to +transformations in PROJ. It is still possible to do that type of transformations +but in many cases there will be a better alternative.</p> +<p>The world view represented by the old API is always sufficient if all you care about is +meter level accuracy - and in many cases it will provide much higher accuracy +than that. But the view that “WGS84 is the <em>true</em> foundation of the world, and +everything else can be transformed natively to and from WGS84” is inherently flawed.</p> +<p>First and foremost because any time WGS84 is mentioned, you should ask yourself +“Which of the six WGS84 realizations are we talking about here?”.</p> +<p>Second, because for many (especially legacy) systems, it may not be straightforward +to transform to WGS84 (or actually ITRF-something, ETRS-something or NAD-something +which appear to be the practical meaning of the term WGS84 in everyday PROJ related +work), while centimeter-level accurate transformations may exist between pairs of +older systems.</p> +<p>The concept of a hub reference frame (“datum”) is not inherently bad, but in many +cases you need to handle and select that datum with more care than the old API allows. +The primary aim of the new API is to allow just that. And to do that, you must realize +that the world is inherently 4 dimensional. You may in many cases assume one or more of +the coordinates to be constant, but basically, to obtain geodetic accuracy transformations, +you need to work in 4 dimensions.</p> +<p>Now, having described the background for introducing the new API, let’s try to show +how to use it. First note that in order to go from system A to system B, the old API +starts by doing an <strong>inverse</strong> transformation from system A to WGS84, then does a +<strong>forward</strong> transformation from WGS84 to system B.</p> +<p>With <strong class="program">cs2cs</strong> being the command line interface to the old API, and +<strong class="program">cct</strong> being the same for the new, this example of doing the same +thing in both world views will should give an idea of the differences:</p> +<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ echo 300000 6100000 | cs2cs +proj=utm +zone=33 +ellps=GRS80 +to +proj=utm +zone=32 +ellps=GRS80 +683687.87 6099299.66 0.00 + + +$ echo 300000 6100000 0 0 | cct +proj=pipeline +step +inv +proj=utm +zone=33 +ellps=GRS80 +step +proj=utm +zone=32 +ellps=GRS80 +683687.8667 6099299.6624 0.0000 0.0000 +</pre></div> +</div> +<p>Lookout for the <code class="docutils literal notranslate"><span class="pre">+inv</span></code> in the first <code class="docutils literal notranslate"><span class="pre">+step</span></code>, indicating an inverse transform.</p> +</section> +<section id="id1"> +<h2>Code example<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h2> +<p>The difference between the old and new API is shown here with a few examples. Below +we implement the same program with the two different API’s. The program reads +input longitude and latitude from the command line and convert them to +projected coordinates with the Mercator projection.</p> +<p>We start by writing the program for PROJ v. 4:</p> +<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><proj_api.h></span><span class="cp"></span> + +<span class="n">main</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">**</span><span class="n">argv</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"></span> +<span class="w"> </span><span class="n">projPJ</span><span class="w"> </span><span class="n">pj_merc</span><span class="p">,</span><span class="w"> </span><span class="n">pj_longlat</span><span class="p">;</span><span class="w"></span> +<span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="p">;</span><span class="w"></span> + +<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="o">!</span><span class="p">(</span><span class="n">pj_longlat</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">pj_init_plus</span><span class="p">(</span><span class="s">"+proj=longlat +ellps=clrk66"</span><span class="p">))</span><span class="w"> </span><span class="p">)</span><span class="w"></span> +<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span><span class="w"></span> +<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="o">!</span><span class="p">(</span><span class="n">pj_merc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">pj_init_plus</span><span class="p">(</span><span class="s">"+proj=merc +ellps=clrk66 +lat_ts=33"</span><span class="p">))</span><span class="w"> </span><span class="p">)</span><span class="w"></span> +<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span><span class="w"></span> + +<span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="n">scanf</span><span class="p">(</span><span class="s">"%lf %lf"</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">y</span><span class="p">)</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">2</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"></span> +<span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="o">*=</span><span class="w"> </span><span class="n">DEG_TO_RAD</span><span class="p">;</span><span class="w"> </span><span class="cm">/* longitude */</span><span class="w"></span> +<span class="w"> </span><span class="n">y</span><span class="w"> </span><span class="o">*=</span><span class="w"> </span><span class="n">DEG_TO_RAD</span><span class="p">;</span><span class="w"> </span><span class="cm">/* latitude */</span><span class="w"></span> +<span class="w"> </span><span class="n">p</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">pj_transform</span><span class="p">(</span><span class="n">pj_longlat</span><span class="p">,</span><span class="w"> </span><span class="n">pj_merc</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">y</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="w"> </span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="n">printf</span><span class="p">(</span><span class="s">"%.2f</span><span class="se">\t</span><span class="s">%.2f</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="p">}</span><span class="w"></span> + +<span class="w"> </span><span class="n">pj_free</span><span class="p">(</span><span class="n">pj_longlat</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="n">pj_free</span><span class="p">(</span><span class="n">pj_merc</span><span class="p">);</span><span class="w"></span> + +<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"></span> +<span class="p">}</span><span class="w"></span> +</pre></div> +</div> +<p>The same program implemented using PROJ v. 5:</p> +<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><proj.h></span><span class="cp"></span> + +<span class="n">main</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">**</span><span class="n">argv</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"></span> +<span class="w"> </span><span class="n">PJ</span><span class="w"> </span><span class="o">*</span><span class="n">P</span><span class="p">;</span><span class="w"></span> +<span class="w"> </span><span class="n">PJ_COORD</span><span class="w"> </span><span class="n">c</span><span class="p">;</span><span class="w"></span> + +<span class="w"> </span><span class="n">P</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">proj_create</span><span class="p">(</span><span class="n">PJ_DEFAULT_CTX</span><span class="p">,</span><span class="w"> </span><span class="s">"+proj=merc +ellps=clrk66 +lat_ts=33"</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">P</span><span class="o">==</span><span class="mi">0</span><span class="p">)</span><span class="w"></span> +<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span><span class="w"></span> + +<span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="n">scanf</span><span class="p">(</span><span class="s">"%lf %lf"</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">c</span><span class="p">.</span><span class="n">lp</span><span class="p">.</span><span class="n">lam</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">c</span><span class="p">.</span><span class="n">lp</span><span class="p">.</span><span class="n">phi</span><span class="p">)</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">2</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"></span> +<span class="w"> </span><span class="n">c</span><span class="p">.</span><span class="n">lp</span><span class="p">.</span><span class="n">lam</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">proj_torad</span><span class="p">(</span><span class="n">c</span><span class="p">.</span><span class="n">lp</span><span class="p">.</span><span class="n">lam</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="n">c</span><span class="p">.</span><span class="n">lp</span><span class="p">.</span><span class="n">phi</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">proj_torad</span><span class="p">(</span><span class="n">c</span><span class="p">.</span><span class="n">lp</span><span class="p">.</span><span class="n">phi</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">proj_trans</span><span class="p">(</span><span class="n">P</span><span class="p">,</span><span class="w"> </span><span class="n">PJ_FWD</span><span class="p">,</span><span class="w"> </span><span class="n">c</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="n">printf</span><span class="p">(</span><span class="s">"%.2f</span><span class="se">\t</span><span class="s">%.2f</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="n">c</span><span class="p">.</span><span class="n">xy</span><span class="p">.</span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">c</span><span class="p">.</span><span class="n">xy</span><span class="p">.</span><span class="n">y</span><span class="p">);</span><span class="w"></span> +<span class="w"> </span><span class="p">}</span><span class="w"></span> + +<span class="w"> </span><span class="n">proj_destroy</span><span class="p">(</span><span class="n">P</span><span class="p">);</span><span class="w"></span> +<span class="p">}</span><span class="w"></span> +</pre></div> +</div> +<p>Looking at the two different programs, there’s a few immediate +differences that catches the eye. First off, the included header file describing +the API has changed from <code class="docutils literal notranslate"><span class="pre">proj_api.h</span></code> to simply <code class="docutils literal notranslate"><span class="pre">proj.h</span></code>. All functions in <code class="docutils literal notranslate"><span class="pre">proj.h</span></code> +belongs to the <code class="docutils literal notranslate"><span class="pre">proj_</span></code> namespace.</p> +<p>With the new API also comes new datatypes. E.g. the transformation object <code class="docutils literal notranslate"><span class="pre">projPJ</span></code> +which has been changed to a pointer of type <code class="docutils literal notranslate"><span class="pre">PJ</span></code>. This is done to highlight the +actual nature of the object, instead of hiding it away behind a typedef. New data +types for handling coordinates have also been introduced. In the above example we +use the <code class="docutils literal notranslate"><span class="pre">PJ_COORD</span></code>, which is a union of various types. The benefit of this is that +it is possible to use the various structs in the union to communicate what state +the data is in at different points in the program. For instance as in the above +example where the coordinate is read from STDIN as a geodetic coordinate, +communicated to the reader of the code by using the <code class="docutils literal notranslate"><span class="pre">c.lp</span></code> struct. +After it has been projected we print it to STDOUT by accessing the individual +elements in <code class="docutils literal notranslate"><span class="pre">c.xy</span></code> to illustrate that the coordinate is now in projected space. +Data types are prefixed with <cite>PJ_</cite>.</p> +<p>The final, and perhaps biggest, change is that the fundamental concept of +transformations in PROJ are now handled in a single transformation object (<code class="docutils literal notranslate"><span class="pre">PJ</span></code>) +and not by stating the source and destination systems as previously. It is of +course still possible to do just that, but the transformation object now +captures the whole transformation from source to destination in one. In the +example with the old API the source system is described as +<code class="docutils literal notranslate"><span class="pre">+proj=latlon</span> <span class="pre">+ellps=clrk66</span></code> and the destination system is described as +<code class="docutils literal notranslate"><span class="pre">+proj=merc</span> <span class="pre">+ellps=clrk66</span> <span class="pre">+lat_ts=33</span></code>. Since the Mercator projection accepts +geodetic coordinates as its input, the description of the source in this case +is superfluous. We use that to our advantage in the new API and simply state +the destination. This is simple at a glance, but is actually a big conceptual +change. We are now focused on the path between two systems instead of what the +source and destination systems are.</p> +</section> +<section id="id2"> +<h2>Function mapping from old to new API<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h2> +<table class="docutils align-default"> +<colgroup> +<col style="width: 50%" /> +<col style="width: 50%" /> +</colgroup> +<thead> +<tr class="row-odd"><th class="head"><p>Old API functions</p></th> +<th class="head"><p>New API functions</p></th> +</tr> +</thead> +<tbody> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_fwd</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_trans" title="proj_trans"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_trans()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_inv</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_trans" title="proj_trans"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_trans()</span></code></a></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_fwd3</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_trans" title="proj_trans"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_trans()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_inv3</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_trans" title="proj_trans"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_trans()</span></code></a></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_transform</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_trans_array" title="proj_trans_array"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_trans_array()</span></code></a> or +<a class="reference internal" href="reference/functions.html#c.proj_trans_generic" title="proj_trans_generic"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_trans_generic()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_init</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_create" title="proj_create"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_create()</span></code></a></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_init_plus</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_create" title="proj_create"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_create()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_free</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_destroy" title="proj_destroy"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_destroy()</span></code></a></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_is_latlong</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_angular_output" title="proj_angular_output"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_angular_output()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_is_geocent</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_angular_output" title="proj_angular_output"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_angular_output()</span></code></a></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_get_def</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_pj_info" title="proj_pj_info"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_pj_info()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_latlong_from_proj</span></code></p></td> +<td><p><em>No equivalent</em></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_set_finder</span></code></p></td> +<td><p><em>No equivalent</em></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_set_searchpath</span></code></p></td> +<td><p><em>No equivalent</em></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_deallocate_grids</span></code></p></td> +<td><p><em>No equivalent</em></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_strerrno</span></code></p></td> +<td><p><em>No equivalent</em></p></td> +</tr> +<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">pj_get_errno_ref</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_errno" title="proj_errno"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_errno()</span></code></a></p></td> +</tr> +<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">pj_get_release</span></code></p></td> +<td><p><a class="reference internal" href="reference/functions.html#c.proj_info" title="proj_info"><code class="xref c c-func docutils literal notranslate"><span class="pre">proj_info()</span></code></a></p></td> +</tr> +</tbody> +</table> +</section> +</section> + + + </div> + </div> + <footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer"> + <a href="bindings.html" class="btn btn-neutral float-left" title="Language bindings" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a> + <a href="../specifications/index.html" class="btn btn-neutral float-right" title="Specifications" 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 |