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<section id="cct">
<span id="id1"></span><h1>cct<a class="headerlink" href="#cct" title="Permalink to this headline">¶</a></h1>
<p id="index-0">Coordinate Conversion and Transformation.</p>
<section id="synopsis">
<h2>Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
<blockquote>
<div><p><strong>cct</strong> [<strong>-cIostvz</strong> [args]] <em>+opt[=arg]</em> … file …</p>
</div></blockquote>
<p>or</p>
<blockquote>
<div><p><strong>cct</strong> [<strong>-cIostvz</strong> [args]] {object_definition} file …</p>
</div></blockquote>
<p>Where {object_definition} is one of the possibilities accepted
by <a class="reference internal" href="../development/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>, provided it expresses a coordinate operation</p>
<blockquote>
<div><ul class="simple">
<li><p>a proj-string,</p></li>
<li><p>a WKT string,</p></li>
<li><p>an object code (like “EPSG:1671” “urn:ogc:def:coordinateOperation:EPSG::1671”),</p></li>
<li><p>an object name. e.g. “ITRF2014 to ETRF2014 (1)”. In that case as
uniqueness is not guaranteed, heuristics are applied to determine the appropriate best match.</p></li>
<li><p>a OGC URN combining references for concatenated operations
(e.g. “<a class="reference external" href="urn:ogc:def:coordinateOperation,coordinateOperation:EPSG::3895,coordinateOperation:EPSG::1618">urn:ogc:def:coordinateOperation,coordinateOperation:EPSG::3895,coordinateOperation:EPSG::1618</a>”)</p></li>
<li><p>a PROJJSON string. The jsonschema is at <a class="reference external" href="https://proj.org/schemas/v0.4/projjson.schema.json">https://proj.org/schemas/v0.4/projjson.schema.json</a></p></li>
</ul>
<div class="versionadded">
<p><span class="versionmodified added">New in version 8.0.0.</span></p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Before version 8.0.0 only proj-strings could be used to instantiate
operations in <strong class="program">cct</strong>.</p>
</div>
</div></blockquote>
<p>or</p>
<blockquote>
<div><p><strong>cct</strong> [<strong>-cIostvz</strong> [args]] {object_reference} file …</p>
</div></blockquote>
<p>where {object_reference} is a filename preceded by the ‘@’ character. The
file referenced by the {object_reference} must contain a valid
{object_definition}.</p>
<blockquote>
<div><div class="versionadded">
<p><span class="versionmodified added">New in version 8.0.0.</span></p>
</div>
</div></blockquote>
</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
<p><strong class="program">cct</strong> is a 4D equivalent to the <strong class="program">proj</strong> projection program,
performs transformation coordinate systems on a set of input points. The
coordinate system transformation can include translation between projected
and geographic coordinates as well as the application of datum shifts.</p>
<p>The following control parameters can appear in any order:</p>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-cct-c">
<span class="sig-name descname"><span class="pre">-c</span></span><span class="sig-prename descclassname"> <span class="pre"><x,y,z,t></span></span><a class="headerlink" href="#cmdoption-cct-c" title="Permalink to this definition">¶</a></dt>
<dd><p>Specify input columns for (up to) 4 input parameters. Defaults to 1,2,3,4.</p>
</dd></dl>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-cct-d">
<span class="sig-name descname"><span class="pre">-d</span></span><span class="sig-prename descclassname"> <span class="pre"><n></span></span><a class="headerlink" href="#cmdoption-cct-d" title="Permalink to this definition">¶</a></dt>
<dd><div class="versionadded">
<p><span class="versionmodified added">New in version 5.2.0.</span></p>
</div>
<p>Specify the number of decimals in the output.</p>
</dd></dl>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-cct-I">
<span id="cmdoption-cct-i"></span><span class="sig-name descname"><span class="pre">-I</span></span><span class="sig-prename descclassname"></span><a class="headerlink" href="#cmdoption-cct-I" title="Permalink to this definition">¶</a></dt>
<dd><p>Do the inverse transformation.</p>
</dd></dl>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-cct-o">
<span id="cmdoption-cct-output"></span><span class="sig-name descname"><span class="pre">-o</span></span><span class="sig-prename descclassname"> <span class="pre"><output</span> <span class="pre">file</span> <span class="pre">name></span></span><span class="sig-prename descclassname"><span class="pre">,</span> </span><span class="sig-name descname"><span class="pre">--output</span></span><span class="sig-prename descclassname"><span class="pre">=<output</span> <span class="pre">file</span> <span class="pre">name></span></span><a class="headerlink" href="#cmdoption-cct-o" title="Permalink to this definition">¶</a></dt>
<dd><p>Specify the name of the output file.</p>
</dd></dl>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-cct-t">
<span id="cmdoption-cct-time"></span><span class="sig-name descname"><span class="pre">-t</span></span><span class="sig-prename descclassname"> <span class="pre"><time></span></span><span class="sig-prename descclassname"><span class="pre">,</span> </span><span class="sig-name descname"><span class="pre">--time</span></span><span class="sig-prename descclassname"><span class="pre">=<time></span></span><a class="headerlink" href="#cmdoption-cct-t" title="Permalink to this definition">¶</a></dt>
<dd><p>Specify a fixed observation <em>time</em> to be used for all input data.</p>
</dd></dl>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-cct-z">
<span id="cmdoption-cct-height"></span><span class="sig-name descname"><span class="pre">-z</span></span><span class="sig-prename descclassname"> <span class="pre"><height></span></span><span class="sig-prename descclassname"><span class="pre">,</span> </span><span class="sig-name descname"><span class="pre">--height</span></span><span class="sig-prename descclassname"><span class="pre">=<height></span></span><a class="headerlink" href="#cmdoption-cct-z" title="Permalink to this definition">¶</a></dt>
<dd><p>Specify a fixed observation <em>height</em> to be used for all input data.</p>
</dd></dl>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-cct-s">
<span id="cmdoption-cct-skip-lines"></span><span class="sig-name descname"><span class="pre">-s</span></span><span class="sig-prename descclassname"> <span class="pre"><n></span></span><span class="sig-prename descclassname"><span class="pre">,</span> </span><span class="sig-name descname"><span class="pre">--skip-lines</span></span><span class="sig-prename descclassname"><span class="pre">=<n></span></span><a class="headerlink" href="#cmdoption-cct-s" title="Permalink to this definition">¶</a></dt>
<dd><div class="versionadded">
<p><span class="versionmodified added">New in version 5.1.0.</span></p>
</div>
<p>Skip the first <em>n</em> lines of input. This applies to any kind of input, whether
it comes from <code class="docutils literal notranslate"><span class="pre">STDIN</span></code>, a file or interactive user input.</p>
</dd></dl>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-cct-v">
<span id="cmdoption-cct-verbose"></span><span class="sig-name descname"><span class="pre">-v</span></span><span class="sig-prename descclassname"></span><span class="sig-prename descclassname"><span class="pre">,</span> </span><span class="sig-name descname"><span class="pre">--verbose</span></span><span class="sig-prename descclassname"></span><a class="headerlink" href="#cmdoption-cct-v" title="Permalink to this definition">¶</a></dt>
<dd><p>Write non-essential, but potentially useful, information to stderr.
Repeat for additional information (<code class="docutils literal notranslate"><span class="pre">-vv</span></code>, <code class="docutils literal notranslate"><span class="pre">-vvv</span></code>, etc.)</p>
</dd></dl>
<dl class="std option">
<dt class="sig sig-object std" id="cmdoption-cct-version">
<span class="sig-name descname"><span class="pre">--version</span></span><span class="sig-prename descclassname"></span><a class="headerlink" href="#cmdoption-cct-version" title="Permalink to this definition">¶</a></dt>
<dd><p>Print version number.</p>
</dd></dl>
<p>The <em>+opt</em> arguments are associated with coordinate operation parameters.
Usage varies with operation.</p>
<p>For a complete description consult the <a class="reference internal" href="../operations/projections/index.html#projections"><span class="std std-ref">projection pages</span></a>.</p>
<p><strong class="program">cct</strong> is an acronym meaning <em>Coordinate Conversion and Transformation</em>.</p>
<p>The acronym refers to definitions given in the OGC 08-015r2/ISO-19111
standard “Geographical Information – Spatial Referencing by Coordinates”,
which defines two different classes of <em>coordinate operations</em>:</p>
<p><em>Coordinate Conversions</em>, which are coordinate operations where input
and output datum are identical (e.g. conversion from geographical to
cartesian coordinates) and</p>
<p><em>Coordinate Transformations</em>, which are coordinate operations where
input and output datums differ (e.g. change of reference frame).</p>
</section>
<section id="use-of-remote-grids">
<h2>Use of remote grids<a class="headerlink" href="#use-of-remote-grids" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified added">New in version 7.0.0.</span></p>
</div>
<p>If the <span class="target" id="index-1"></span><a class="reference internal" href="../usage/environmentvars.html#envvar-PROJ_NETWORK"><code class="xref std std-envvar docutils literal notranslate"><span class="pre">PROJ_NETWORK</span></code></a> environment variable is set to <code class="docutils literal notranslate"><span class="pre">ON</span></code>,
<strong class="program">cct</strong> will attempt to use remote grids stored on CDN (Content
Delivery Network) storage, when they are not available locally.</p>
<p>More details are available in the <a class="reference internal" href="../usage/network.html#network"><span class="std std-ref">Network capabilities</span></a> section.</p>
</section>
<section id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
<ol class="arabic simple">
<li><p>The operator specs describe the action to be performed by <strong class="program">cct</strong>. So
the following script</p></li>
</ol>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">echo 12 55 0 0 | cct +proj=utm +zone=32 +ellps=GRS80</span>
</pre></div>
</div>
<p>will transform the input geographic coordinates into UTM zone 32 coordinates.
Hence, the command</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">echo 12 55 | cct -z0 -t0 +proj=utm +zone=32 +ellps=GRS80</span>
</pre></div>
</div>
<p>Should give results comparable to the classic <strong class="program">proj</strong> command</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">echo 12 55 | proj +proj=utm +zone=32 +ellps=GRS80</span>
</pre></div>
</div>
<ol class="arabic simple" start="2">
<li><p>Convert geographical input to UTM zone 32 on the GRS80 ellipsoid:</p></li>
</ol>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">cct +proj=utm +ellps=GRS80 +zone=32</span>
</pre></div>
</div>
<ol class="arabic simple" start="3">
<li><p>Roundtrip accuracy check for the case above:</p></li>
</ol>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">cct +proj=pipeline +proj=utm +ellps=GRS80 +zone=32 +step +step +inv</span>
</pre></div>
</div>
<ol class="arabic simple" start="4">
<li><p>As (2) but specify input columns for longitude, latitude, height and time:</p></li>
</ol>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">cct -c 5,2,1,4 +proj=utm +ellps=GRS80 +zone=32</span>
</pre></div>
</div>
<ol class="arabic simple" start="5">
<li><p>As (2) but specify fixed height and time, hence needing only 2 cols in
input:</p></li>
</ol>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">cct -t 0 -z 0 +proj=utm +ellps=GRS80 +zone=32</span>
</pre></div>
</div>
<ol class="arabic simple" start="6">
<li><p>Auxiliary data following the coordinate input is forward to the output
stream:</p></li>
</ol>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span><span class="nb">echo</span> <span class="m">12</span> <span class="m">56</span> <span class="m">100</span> <span class="m">2018</span>.0 auxiliary data <span class="p">|</span> cct +proj<span class="o">=</span>merc
<span class="go">1335833.8895 7522963.2411 100.0000 2018.0000 auxiliary data</span>
</pre></div>
</div>
<ol class="arabic simple" start="7">
<li><p>Coordinate operation referenced through its code</p></li>
</ol>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span><span class="nb">echo</span> <span class="m">3541657</span>.3778 <span class="m">948984</span>.2343 <span class="m">5201383</span>.5231 <span class="m">2020</span>.5 <span class="p">|</span> cct EPSG:8366
<span class="go">3541657.9112 948983.7503 5201383.2482 2020.5000</span>
</pre></div>
</div>
<ol class="arabic simple" start="8">
<li><p>Coordinate operation referenced through its name</p></li>
</ol>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span><span class="nb">echo</span> <span class="m">3541657</span>.3778 <span class="m">948984</span>.2343 <span class="m">5201383</span>.5231 <span class="m">2020</span>.5 <span class="p">|</span> cct <span class="s2">"ITRF2014 to ETRF2014 (1)"</span>
<span class="go">3541657.9112 948983.7503 5201383.2482 2020.5000</span>
</pre></div>
</div>
</section>
<section id="background">
<h2>Background<a class="headerlink" href="#background" title="Permalink to this headline">¶</a></h2>
<p><strong class="program">cct</strong> also refers to Carl Christian Tscherning (1942–2014),
professor of Geodesy at the University of Copenhagen, mentor and advisor
for a generation of Danish geodesists, colleague and collaborator for
two generations of global geodesists, Secretary General for the
International Association of Geodesy, IAG (1995–2007), fellow of the
American Geophysical Union (1991), recipient of the IAG Levallois Medal
(2007), the European Geosciences Union Vening Meinesz Medal (2008), and
of numerous other honours.</p>
<p><em>cct</em>, or Christian, as he was known to most of us, was recognized for his
good mood, his sharp wit, his tireless work, and his great commitment to
the development of geodesy – both through his scientific contributions,
comprising more than 250 publications, and by his mentoring and teaching
of the next generations of geodesists.</p>
<p>As Christian was an avid Fortran programmer, and a keen Unix connoisseur,
he would have enjoyed to know that his initials would be used to name a
modest Unix style transformation filter, hinting at the tireless aspect
of his personality, which was certainly one of the reasons he accomplished
so much, and meant so much to so many people.</p>
<p>Hence, in honour of <em>cct</em> (the geodesist) this is <strong class="program">cct</strong> (the program).</p>
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