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<section id="quick-start"> +<span id="quickstart"></span><h1>Quick start<a class="headerlink" href="#quick-start" title="Permalink to this headline">¶</a></h1> +<p>Coordinate transformations are defined by, what in PROJ terminology is +known as, “proj-strings”. A proj-string describes any transformation regardless of +how simple or complicated it might be. The simplest case is projection of geodetic +coordinates. This section focuses on the simpler cases and introduces the basic +anatomy of the proj-string. The complex cases are discussed in +<a class="reference internal" href="transformation.html"><span class="doc">Geodetic transformation</span></a>.</p> +<p>A proj-strings holds the parameters of a given coordinate transformation, e.g.</p> +<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>+proj=merc +lat_ts=56.5 +ellps=GRS80 +</pre></div> +</div> +<p>I.e. a proj-string consists of a projection specifier, <code class="docutils literal notranslate"><span class="pre">+proj</span></code>, a number of +parameters that applies to the projection and, if needed, a description of a +datum shift. In the example above geodetic coordinates are transformed to +projected space with the <a class="reference internal" href="../operations/projections/merc.html"><span class="doc">Mercator projection</span></a> with +the latitude of true scale at 56.5 degrees north on the GRS80 ellipsoid. Every +projection in PROJ is identified by a shorthand such as <code class="docutils literal notranslate"><span class="pre">merc</span></code> in the above +example.</p> +<p>By using the above projection definition as parameters for the command line +utility <strong class="program">proj</strong> we can convert the geodetic coordinates to projected space:</p> +<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ proj +proj=merc +lat_ts=56.5 +ellps=GRS80 +</pre></div> +</div> +<p>If called as above <strong class="program">proj</strong> will be in interactive mode, letting you +type the input data manually and getting a response presented on screen. +<strong class="program">proj</strong> works as any UNIX filter though, which means that you can also +pipe data to the utility, for instance by using the <strong class="program">echo</strong> command:</p> +<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ echo 55.2 12.2 | proj +proj=merc +lat_ts=56.5 +ellps=GRS80 +3399483.80 752085.60 +</pre></div> +</div> +<p>PROJ also comes bundled with the <strong class="program">cs2cs</strong> utility which is used to +transform from one coordinate reference system to another. Say we want to +convert the above Mercator coordinates to UTM, we can do that with +<strong class="program">cs2cs</strong>:</p> +<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ echo 3399483.80 752085.60 | cs2cs +proj=merc +lat_ts=56.5 +ellps=GRS80 +to +proj=utm +zone=32 +6103992.36 1924052.47 0.00 +</pre></div> +</div> +<p>Notice the <code class="docutils literal notranslate"><span class="pre">+to</span></code> parameter that separates the source and destination +projection definitions.</p> +<p>If you happen to know the EPSG identifiers for the two coordinates reference +systems you are transforming between you can use those with <strong class="program">cs2cs</strong>:</p> +<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ echo 56 12 | cs2cs +init=epsg:4326 +to +init=epsg:25832 +231950.54 1920310.71 0.00 +</pre></div> +</div> +<p>In the above example we transform geodetic coordinates in the WGS84 reference +frame to UTM zone 32N coordinates in the ETRS89 reference frame. +UTM coordinates</p> +</section> + + + </div> + </div> + <footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer"> + <a href="index.html" class="btn btn-neutral float-left" title="Using PROJ" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a> + <a href="projections.html" class="btn btn-neutral float-right" title="Cartographic projection" 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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