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| author | PROJ deploybot <proj.bot@proj.bot> | 2022-03-22 20:00:06 +0000 |
|---|---|---|
| committer | PROJ deploybot <proj.bot@proj.bot> | 2022-03-22 20:00:06 +0000 |
| commit | a3f43744feec86272fe532124679d3a013ef9a8c (patch) | |
| tree | 27e4198db6011e3097eb7bcfe7197684aba7583a /glossary.html | |
| download | PROJ-gh-pages.tar.gz PROJ-gh-pages.zip | |
update with results of commit https://github.com/OSGeo/PROJ/commit/53c07a8bd211b7aee4bc07a9c6726005504b7181gh-pages
Diffstat (limited to 'glossary.html')
| -rw-r--r-- | glossary.html | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/glossary.html b/glossary.html new file mode 100644 index 00000000..b7c31ae7 --- /dev/null +++ b/glossary.html @@ -0,0 +1,169 @@ +<!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>Glossary — 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.orgglossary.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> 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+ <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>Glossary</li> + <li class="wy-breadcrumbs-aside"> + <a href="https://github.com/OSGeo/PROJ/edit/8.2/docs/source/glossary.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="faq.html" class="btn btn-neutral float-left" title="FAQ" accesskey="p"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a> + <a href="zreferences.html" class="btn btn-neutral float-right" title="References" 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="glossary"> +<span id="id1"></span><h1>Glossary<a class="headerlink" href="#glossary" title="Permalink to this headline">¶</a></h1> +<dl class="glossary"> +<dt id="term-Ballpark-transformation">Ballpark transformation<a class="headerlink" href="#term-Ballpark-transformation" title="Permalink to this term">¶</a></dt><dd><p>For a transformation between two geographic CRS, a ballpark +transformation is a coordinate operation that only takes into account +potential difference of axis orders (long-lat vs lat-long), +units (degree vs grads) and prime meridian (Greenwich vs Paris/Rome/other +historic prime meridians). It does not attempt any datum shift, hence +the “ballpark” qualifier in its name. Its accuracy is unknown, and could +lead in some cases to errors of a few hundreds of metres.</p> +<p>For a transformation between two vertical CRS or a vertical CRS and +a geographic CRS, a ballpark transformation only takes into account +potential different in units (e.g. metres vs feet). Its accuracy is +unknown, and could lead in some cases to errors of a few tens of metres.</p> +<div class="admonition note"> +<p class="admonition-title">Note</p> +<p>The term “Ballpark transformation” is specific to PROJ.</p> +</div> +</dd> +<dt id="term-Pseudocylindrical-Projection">Pseudocylindrical Projection<a class="headerlink" href="#term-Pseudocylindrical-Projection" title="Permalink to this term">¶</a></dt><dd><p>Pseudocylindrical projections have the mathematical characteristics of</p> +<div class="math notranslate nohighlight"> +\[ \begin{align}\begin{aligned}x &= f(\lambda,\phi)\\y &= g(\phi)\end{aligned}\end{align} \]</div> +<p>where the parallels of latitude are straight lines, like cylindrical +projections, but the meridians are curved toward the center as they +depart from the equator. This is an effort to minimize the distortion +of the polar regions inherent in the cylindrical projections.</p> +<p>Pseudocylindrical projections are almost exclusively used for small +scale global displays and, except for the Sinusoidal projection, only +derived for a spherical Earth. Because of the basic definition none of +the pseudocylindrical projections are conformal but many are equal +area.</p> +<p>To further reduce distortion, pseudocylindrical are often presented in +interrupted form that are made by joining several regions with +appropriate central meridians and false easting and clipping +boundaries. Interrupted Homolosine constructions are suited for showing +respective global land and oceanic regions, for example. To reduce the +lateral size of the map, some uses remove an irregular, North-South +strip of the mid-Atlantic region so that the western tip of Africa is +plotted north of the eastern tip of South America.</p> +</dd> +</dl> +</section> + + + </div> + </div> + <footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer"> + <a href="faq.html" class="btn btn-neutral float-left" title="FAQ" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a> + <a href="zreferences.html" class="btn btn-neutral float-right" title="References" 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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